Physics Questions and Answers November 23, 2022

The 1kg ball is released from rest when the cord is horizontal. It collided with the 4kg block B which is initially at rest. After collision a minion pushes the block at the opposite direction with a force P (5t1) N, where t is in seconds. Determine the time it would take for the block to stop. Take e 0.5 and neglect the friction between the

Suppose you are in an accelerated elevator. Your weight on earth is 700 N. If the acceleration is the same as the earth's gravitational acceleration, what is your apparent weight?

A man pushes a 24 kg crate with a force of 38 N at angle 39 to horizontal. What is the normal force exerted on the crate by the floor? Round the answer to the nearest integer.

Block 1 (3.1 kg) is placed on an incline at 20 and connected with block 2 (2.3 kg) suspended from the higher edge of the incline . What is the magnitude of the acceleration of the masses? (Neglect friction)

1. Describe the characteristics of an object exhibiting projectile motion. 2. Explain how the motion of objects moving in two dimension is analyzed. Include the formulas for calculating maximum range and maximum height of projectiles.

Dana rolls a marble with a speed of 5.0 m/s across a level table that is 1.6 m above the floor. Upon reaching the edge of the table, it follows a parabolic path to the floor. How far does the marble travel in the x-direction?

The mass of a particular eagle is twice that of a hunted pigeon. Suppose the pigeon is flying north at v,2 16.3 ms when the eagle swoops down, grabs the pigeon, and flies off. At the instant right before the attack, the eagle is flying toward the pigeon at an angle 57.9 below the horizontal and a speed of ,1 36.7 ms. What is the speed up of the

A 44.2 kg video cart is rolled down a hallway. It is accelerated at 0.14 m/s2. If a force of 32 N is applied to move the cart, what force of friction do the wheels have against the floor?

A 265 kg boulder is pulled with a rope across a field by a strong man. If the man uses a force of 2,441 N to cause the boulder to accelerate across the field. The coefficient of friction is 0.60. How fast does the strong man accelerate the boulder?

You are working in the preliminary design of an adiabatic nozzle that will accelerate a flow of air. Your job is to specify the pressure and temperature conditions at the inlet of a nozzle such that the actual exit conditions are m a. Velocity Va 450 Temperature, Pressure, Pa 120 kPa Also, the isentropic efficiency of the nozzle must be kept

One way we might try to see the vacuum inside a bell jar is to (somehow) levitate a soap bubble in the bell jar and watch the bubble expand as the pressure in the bell jar is decreased. A force balance on a bubble will show that the relationship between the pressure inside and outside the bubble is Pinside 40 r Poutside where , a constant, is the

What does it mean to say that collisions between ideal gas molecules are "elastic?"

How many quantum numbers did Bohr use in his model to identify the various electron orbits?

Determine the r and y-components of the velocity of a molecule colliding with a sturdy wall, in terms of the molecule's incoming speed (v) and incident angle (0). Take +x to the right and +y as up.

A body temperature of 40.2 C would result in a high fever. Convert this temperature into F, using the correct equation. Tc = TF - 32 1.8 T = 1.8(T) + 32 T=T + 273 K Remember to select an answer with the correct number of significant figures.

30.1 The parallel network of Figure 2.33 is connected to a sinusoidal ac supply that is represented by the following equation 339.411 cos (t2) V at 60 Hz 30.2 e(t) Calculate the voltage drop across the coil ZL3. C Calculate the resistance and inductance of the coil Z3. ) 30.3 Calculate the current drawn from the supply. 30.4 Calculate the total

Which statement is true about CMOS IC family O CMOS chips are operate with a wide range of supply voltages (typically 3 to 18 volts) O CMOS chips are much larger in size O CMOS chips are operate with a wide range of supply voltages (typically 0 to 100 volts) O CMOS chips are operate with only 5v supply voltages

A block of mass 3.0 kg is hung from a spring, causing it to stretch 12 cm at equilibrium, as shown. The 3.0 kg block is then replaced by a 4.0 kg block, and the new block is released from the position shown, at which the spring is not stretched. Determine the maximum up ward acceleration that the 4.0 kg block will experience. 12 cm 3 kg 4 kg

A robot probe drops a camera off the rim of a 239 m high cliff on Mars, where the free-fall acceleration is -3.7 m/s 2 . a. Find the time required for the camera to reach the ground. b. Find the velocity with which it hits the ground.

An applied force of 50N is used to accelerate an object to the right across a frictional surface. The object encounters 10N of friction. Use the diagram to determine the normal force. the net force. the mass. and the acceleration of the object.

Ffrict 10 N norm grav Fapp 50 N 80 N

Frict H norm grav,A 5kg object is sliding to the right and encountering a friction force that slows it down. The coefficient of friction () between the object and the surface is 0.1. Determine the force of gravity, the normal force, the force of friction, the net force, and the acceleration. (Neglect air resistance.)

1. During this reverse fly exercise, each dumbbell has a mass of 9 kg. The length of your arm is 0.82m. Body a. On each image, draw and label the force of gravity and the force of the muscle. b. How much force is the dumbbell applying when held in a static position (hint the acceleration of gravity is 9.8 ms) Shoulder joint c. When your arm is

Devin applies a 4.25-N rightward force to a 0.765-kg book to accelerate it across a tabletop. The coefficient of friction between the book and the tabletop is 0.410. Determine the acceleration of the book?

AHfus of water is 6024 Jmol at 273 K. The densities of solid and liquid water are 0.915 and 1.000 gmL, respectively. What is the freezing point of water under 100 bar of pressure You may assume that AHfus and the densities are independent of pressure.

An 1100-kg car is slowing down to the left and encountering friction, with a coefficient of 0.270. Find the acceleration, the normal force, and the net force?

In a physics lab, Kairi and Mike use a hanging mass and pulley system to exert a 2.45 N rightward force on a 0.500-kg cart to accelerate it across a low-friction track. If the total resistance force to the motion of the cart is 0.72 N, then what is the cart's acceleration?

A silver wire and a copper wire are welded together as shown in the figure. The left end of the silver wire is at 8.00 V and the right end of the copper wire is at 3.00 V. Both wires carry the same current of 1 4.50 A, and both have the same diameter 0.600 mm. 8.00 V E2.30 Vm 120 cm silver 80.0 cm copper (a) Find the electric field in the copper

Student applies a force to push a 20 N cart across an icy slippery surface for a period of 4.0 sec. As a result, the cart goes from rest to a velocity of 3.5 m/s. Coefficient of kinetic friction is 0.110. Find the acceleration, the net force, and the application force?

On the surface of Mercury, the gravitational field strength is 0.38 times its value on Earth. What would be the weight of a 1.20-kg hammer on the surface of Mercury?

Youve been asked to use Bilinear Transformation (use T 2) to design a Butterworth lowpass filter that satisfies certain given discretetime specifications. If you obtain the following values for N and 2 N 1.25 and 2 0.9 Answer the following A) Plot the poles of the filter on the sdomain polezero plot B) Using the obtained poles, find He(s) C)

An elevator and the ten passengers inside have a total mass of 1380 kg. Find the work done by the force of gravity on the elevator with its passengers as the elevator moves from the first floor to the twenty-first floor, a distance of 65.0 m.

In 1975, the F-15 Streak Eagle fighter jet broke a world record for the time to climb to an altitude of 30.0 km in just 3 minutes 27.8 seconds. If the jet's increase in gravitational potential energy during the flight from the ground was 5.93 x 109 J, determine the mass of the airplane?

A cell phone is tossed from the top of a 20.0 m high balcony with an initial velocity of 0.500 m/s , directed 33.0 below the horizontal. Using energy techniques and ignoring any air resistance, find the speed of the phone as it reaches the sidewalk below the balcony?

A 22-kg scooter started moving at 32 m/s in a direction 18 degrees above the horizontal. When it has fallen to a point that is 7.0 m below the initial point measured vertically (without air friction), What would be the block's kinetic energy ?

A supertanker ship with a mass of 5.90 x 10 8 kg starts from rest in port and moves out to the open ocean with a constant acceleration under the action of the ship's engines that can deliver 3.40 x 10 7 J every second. How long will it take the ship to reach a speed of 8.5 m/s, if 42 % of the energy provided by the engines is used to overcome

In the winter sport of luge racing on one particular track, the luge sleds start at an altitude of 385 m and finish at an altitude of 265 m. One racer and his sled have a combined mass of 105 kg and reach the bottom of the track moving at 140 km/h. Determine the work done on the sled and its rider by non-conservative forces?

On a mission to an unknown planet, Aimee Astronaut decides to practice her golf swing. She hits a ball with a speed of 38.5 m/s at an angle of 57. 0 above the horizontal. The ball reaches maximum height of 69.5 m. What is the magnitude of the acceleration due to gravity on the unknown planet?

Consider a massive particle at rest. This particle is unstable and decays into three massless particles: the first and the second are moving at right angles to each other and have 100 GeV energy each. What was the mass of the unstable particle?

You have a light spring which obeys Hooke's law. This spring stretches 2.32 cm vertically when a 2.60 kg object is suspended from it. Determine the following. (a) the force constant of the spring (in N/m) (b) the distance (in cm) the spring stretches if you replace the 2.60 kg object with a 1.30 kg object . (c) the amount of work (in ]) an

Earth is (approximately) a sphere with a radius RE6,355.0 km that is spinning around its own axis once every 24 hours, and rotating around the Sun on an orbit that has an average radius of 1 AU1.496E8 km and an orbital period of 365.25 days. What is the centripetal acceleration of a person standing on the Equator due to Earths rotation about its

The x and y positions as functions of time for a particle moving in the xy plane are given by x 3 m (1.6 ms) t y 2 m (1.7 ms) t (0.4 ms2) t2 What is its instantaneous speed at t 5.5 seconds Provide your answer in units of (ms) to 2 decimal places. Do not use scientific notation.

A box slides from rest down a frictionless ramp inclined at 32. 0 with respect to the horizontal and is stopped at the bottom of the ramp by a spring with a spring constant of k = 1.00 x 10 4 N/m. If the box has a mass of 12.0 kg and slides 3.00 m from the point of release to the point where it comes to rest against the spring, determine the

point of release compression of spring

A cat is standing 0.450 m from the edge of a table 0.923 m high. The cat jumps up onto the table in such a way that it is traveling horizontally when it lands. How much time does the cat spend in the air?

R VT 0 0 rads Many years ago, Dr. Plume was lucky enough to sit in a centrifuge at NASAs Goddard Space Flight Centre. The seat of the centrifuge is a distance R 14.0 m from the centre and travels around a circular path in the counterclockwise direction (see the figure). The centrifuge started at angular position 0.4 rads and time t Os with a

Gilligan has a mass of 50 kg. His boat, the S. S. Minnow is 4 meters long and has a mass of 500 kg. As Gilligan walks from the stern (back) to the bow (front) of the boat, he notices that the boat starts moving backwards. When he stops walking at the bow, the boat stops moving. If Gilligan walked the full 4 meters from stern to bow, how far did

Consider an object that is moving along a circular path of radius 18.5 m. At the moment shown in the picture, the object is moving with speed vand the magnitude of its speed is changing at the rate of 0.51 ms. The object experiences total acceleration of 0.78 ms X V y What is the speed of the object at

An optical disk drive in a computer can spin a disk at up to 10,000 rpm. If a particular disk is spun at 8130 rpm while it is being read, and then is allowed to come to rest over 0.234 s, what is the magnitude of the average angular acceleration of the disk? If the disk is 12.0 cm in diameter, what is the magnitude of the tangential linear

An archer is attempting to shoot an arrow over a wall that is 76 meters tall. Using the most efficient firing angle with no wind resistance what is the minimum velocity the arrow must have at launch to get over the wall? Assume the wall is located in the middle of the arrows flight. What is the total flight time for the arrow and what is its total

A golfer tees off on a hill located 75 meters below the green. If the golfer wants a hole in one and the hole is 285 meters away, will they succeed? If not, how far away will the ball land from the hole? Use 60 m/s at 60 degrees for the initial golf ball velocity.

Two photons, are approaching each other, head-on. One of the photons has energy 10MeV and the other one has energy 20Mev. What is the total energy of this system, in MeV?

A tire is spinning above ground (not touching the ground) at 30 radians per seconds. If it is now pressed against the ground such that it experience a angular acceleration of -3 rad per second squared, how long will it take for the tire to come to a stop?

An air source heat pump is designed to have a HSPF of 9.6 btu/Wh. If the heat pump is to utilize 2776 kWh of electricity during the winter season, how many BTUs does the heat pump need to provide?

A student has a small battery-powered alarm buzzer. The student throws the buzzer toward a stationary wall (possibly due to frustration). The buzzer emits sound with a frequency of 92 Hz and the wall reflects the sound. If the buzzer is moving directly away from the student (and directly toward the wall) with a speed of 6.3 m/s, what beat

An air hockey puck is moving directly along the y-direction at 0.242 m/s. A player strikes the puck for 0.0187 s, creating a constant acceleration of 149 m/s 2 in a direction 30 degree above the x-axis. What is the velocity (magnitude and direction) of the puck after being struck?

A 35 kg child swings from the arms of two adults as pictured. if the tension in the right adult's arm is 254 N at an angle of 70 degrees, find the tension (magnitude and direction) in the left adult's arm that keeps the child in equilibrium. include a free body diagram.

An eagle stoops to attack its prey by pulling in its wings and diving down in the air. It a 4.5 kg eagle dives at an angle of 52 degrees below the horizontal and feels a resistive force of 15 N directly opposed to its motion, then: -Draw a free body diagram for the eagle, with +x and +y-axes and angles labeled . - What is the magnitude and

A cart on a ramp is attached to a hanging mass as shown in the diagram. The mass of the cart is 270 g, the hanging mass is 100 g, and the angle is 40 degrees. Ignoring friction on the ramp, find the acceleration of the system and the tension in the string. Include a free body diagram for the cart and one for the mass.

M C e m

A gym owner sets up a hanging bag suspended from a horizontal beam. The beam is secured by a rope to the wall, as shown in the figure. At the place where the beam is secured to the wall, it feels both a normal force horizontally and a normal force vertically, due to the pin that lets the beam pivot. The rope is connected at 0.3 m from the wall,

bag beam 30

Consider a firecracker that after being triggered explodes after 1 second. An observer A is standing some distance away from observer B who is traveling with constant velocity towards A with the firecracker. The velocity of B and distance between A and B is such that B will reach A in 1 sec as measured by A. At this instant B triggers the

A uniform electric field E (6 kVm) i established in the xyplane. Consider the spatial coordinates Po (0,0) cm, P (4,0) cm and P (4,4) cm. a. Which point is at a higher potential Explain in 12 sentences. b. Calculate the magnitude of the voltage between P and P. c. If an external agent moves a charged body q, that has charge 3e on it from P to P

Imagine two 20 [cm] long copper wires 5 [cm] apart. What is the force between the wires if 32 [A] is pumped through each of them in the same direction? Explain why it's attractive.

In one ride in an amusement park, people are going around in a circle as their seats are held by chains. Consider one ride where the radius of the circular path is 20 m and it takes 10 seconds to complete a full trip around the circular path. At what angle must the chains be hanging with respect to the vertical

Skaters Jack and Jill at the beginning of their act push each other. It gives Jack initial speed of 3.4 m/s. What is the Jill's initial velocity if her mass is 32 kg and Jack's mass is 64 kg?

Two window washers, Bob and Joe, are on a 3.00-m-long, 385-N scaffold supported by two cables attached to its ends. Bob weighs 810 N and stands 1.00 m from the left end, as shown in the figure below. Two meters from the left end is the 500-N washing equipment. Joe is 0.500 m from the right end and weighs 910 N. Given that the scaffold is in

Bob 1.00 m 2.00 m 3.00 m Joe 0.500 m

(a) Find the tension in the support cable. (b) Find the components of the reaction force exerted by the pivot on the boom. (Assume the positive x-direction is to the right and the positive y-direction is upward.

A 1,000N uniform boom at 58.5 to the horizontal is supported by a cable at an angle 31.5 to the horizontal as shown in the figure below. The boom is pivoted at the bottom, and an object of weight w 2,450 N hangs from its top. Pivot

b A loop of wire carrying current I is bent into a long thin rectangle (bx c) as shown. P a) Estimate the force per length at point P (the midpoint of a long side of the rectangle). What direction is this force b) Use the BiotSavart Law to argue whether the force per length at point Q is greater, less, or equal to the force per length at point P.

Consider the following circuit where Rs RB 9 k2, RE RL 1.5 KM, kB 60. Assume an Early effect VA 25V, VT 25mV, and the transistor is operating in the active region. For the DC analysis assume VBE 0.7V Find the voltage gain VoutVs Vs Rs ww C RB 5V C RE 5V Vout RL

1 - An object moves in a straight line with a speed of 7.27 m/s. In how many seconds does the body travel 80.7 m? 2 - If the diameter of the first spherical object is 5 times the diameter of the second spherical object, then how many times the volume of the first object is greater than the second?

The tire has a mass of 230 kg and a diameter of 1.50 m. Your hands are a full diameter away from the contact point (the point on the tire that remains in contact with the ground). Calculate the minimum force you need to apply to the tire to start it rotating about the contact point, assuming the tire is initially horizontal. Assume the mass of the

Find the radius of the circle: a) when 0= 90, A = 20 cm b) when 0-30, A = 35 cm c) when 0= 150, A = 114 cm

A

1. Why does basketball motion show projectile motion, explain? What is acceleration in X and Y direction during projectile motion? Does final and initial velocity in X direction change during projectile motion, why or why not, explain? 2. You threw a ball at 25 o from X axis, and it has initial velocity V o = 15 m/s. Find out what are its X and Y

1. What is Newton's three laws of motion? Explain them with one example of each from your daily life. 2. You are applying a force of 250 N and surface has friction force of 30 N. If mass of the object is 10 kg, find out its weight (F g ), normal force (F n ), net force (F net ) and acceleration of movement (a). 3. The weight of a table is 981 N on

A mh = 73.0 kg bricklayer carries mb = 28.0 kg of bricks up a ladder through a vertical height of h = 4.25 m in t = 5.75 s. (a) What is the average power required? (b) What is the average useful output power?

A student throws a water balloon horizontally at 5 m/s out a 10 m high window of the dorm. What is the time of flight? What is the impact velocity? How far from the base of the dorm does the water balloon land?

A 0.120 kg ball travelling at 11.0 m/s impacts a solid massive steel wall. The ball bounces straight back at 8.9 m/s. -C Before v=11.0 m/s After v=8.9 m/s If the ball was in contact with the steel wall for 0.17 s, what is the magnitude of the force that the steel wall imparted on the ball?

A ball is kicked off a 5 m high platform at 20 m/s at 30. What is the maximum height reached? What is the time of flight? What is the distance from the platform the ball lands? What is the impact velocity?

10 kg 55 N 837 5m A string exerts a tension force of 55 N on a 10kg block as it moves a distance of 5 m up a frictionless incline, as shown. The string pulls parallel to the incline. a) Find the total external work done on the blockearth system as the block moves 5 m up the incline. b) Find the change in gravitational potential energy for the

A rope is suspended from a branch. You wish to raise yourself up off the ground by running along the ground, grabbing the rope, and letting the rope swing you upward. How fast would you have to run to be able to rise by 2 m?

You swing on a Tarzan Rope from a ledge that is 5 m above the lake. Your 5m rope is fastened to a tree limb that is 6 m above the lakes surface. When you let go, you have passed the bottom of the swing and have risen to a height of 2 m above the water. How fast are you traveling just before you finally hit the water 5 m 5m Tree limb 6 m from lakes

An extreme skier takes off from a jump and is going for height. If she leaves the jump traveling 15 ms, and is traveling 13 ms as she reaches the top of her flight, how high does she get above the top of the ramp v 15 ms z v 13 ms h

A 2000kg car crashes into a stationary power station. This brings your car to rest in 0.2 seconds. If your car was traveling at 30 m/s before the collision, calculate the magnitude of the average force the car exerts on the brick wall of the power station.

A 75kg skier starts from rest at the top of a hill that makes an angle of 35 degrees with the horizontal. The coefficient of kinetic friction is 0.1. a) How much energy is lost to friction as the skier slides 25 meters downward along the slope b) What is the speed of the skier after he has slid those 25 meters 35

A car moving at 20 km/hr skids 10 m with locked brakes before coming to rest. How far will the car skid (on the same surface) if it is traveling at 80 km/hr?

A 2 kg box with some initial velocity slides up a frictionless ramp, which is at a 15 angle to the ground, until the box comes to rest 1 second later. Make a model of the situation and find the work done on the box using both energy and forces.

An electric field along the x-axis is given by E-1007 N/C for x>0 and E =-100 N/C for x <0. A right circular cylinder of length 20 cm and radius 5 cm lies parallel to the x-axis, with its center at the origin and one face at x = +10 cm, the other face at x = - 10 cm. Calculate the net outward flux through the cylinder.

A cirque du soleil performer is launched from a 20 m high platform at 10 m/s at 20. What is the maximum height the performer reaches? What is the position (x and y) and velocity of the performer at 0.6 s?

If a lightbulb has a power of 60 W, how much energy in Joules does it produce in 1 hour?

An evacuated cylindrical vessel of45cm diameter closed with a circular lid. Estimate the effort(force)required for lifting the lid, if the atmospheric pressure is95cm of the mercury column (Take the density of mercury is 13.6 times 103 kg/m3. Take g = 9.81 m/s2.)

1. A small block of mass m is placed on an incline with an angle with respect to the horizontal. The block begins a height h above the ground. The coefficient of kinetic friction for the two surfaces is k. a. (5 points) Draw a good physics diagram. Use a straight edge. b. (15 points) How long does it take to hit the bottom of the incline What

1. How potential energy can become kinetic energy? 2. Why potential energy and chemical energy are different? 3. How potential energy and kinetic energy are different? 4. Why molecules only store chemical energy?

a. A train has a brass band playing a song at frequency 20C Hz. As the train passes the station, a person on the platform hears a band playing a note at 1500 Hz, Vsnd 340 ms, Calculate the speed of the train b. You use a barometer made up from unknown liquid. The liquid level rises to A m when you measure the atmospheric pressure. Calculate the

2. A light, unstretchable string is attached securely at one end to a small dense ball of mass m the other end is attached to the ceiling. The ball is thrown at a speed v so that the ball executes stable circular motion of radius R in a horizontal plane. The string makes an angle with the vertical. a. (5 points) Draw a good physics diagram. Use a

In a hypothetical universe, magnetic monopoles (charge qm) were found to exist. The magnetic field due to the unit magnetic charge is given by B Ho qm 4 12 i) Determine the magnetic flux (m) passing through a closed spherical surface (radius r) enclosing the magnetic monopole. ii) Evaluate the divergence of magnetic field (Gauss law for

Consider a thin rod that lies along the xaxis and has a total length L. It is pivoted at the left end, at x 0. It has a nonuniform linear mass density given in kgm by (x) Ax Bx. What is the moment of inertia of this rod

3. A 2.40 kg puck slides on a frictionless horizontal surface. It has an initial velocity (6.20 1.20) ms. a. (05 points) Draw a clear physics diagram. Use a straight edge. b. (05 points) What is the initial kinetic energy c. (10 points) Find the net work done on the ball if it suffers a collision so that its final velocity is (8.001 4.001) ms

A collapsible plastic bag (figure below) contains a glucose solution. If the average gauge pressure in the vein is 1.20 x 103 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein Assume the specific gravity of the solution is 1.04. h h Glucose solution

Some microwaves operate using 1100 W of electrical power. If the current in the outlet is 20 A, what voltage is needed? Show your work. Give your answer with the correct units.

Calculate the mass of a solid gold rectangular bar that has dimensions wh 4.10 cm x 14.0 cm x 28.0 cm. (The density of gold is 19.3 x 10 kgm.) kg

A grindstone with I = 4,000 kg - m is rotating at an initial speed = 2.2 Friction and then brings it to rest after 9.4 revolutions. What is the magnitude of the torque exerted on the grindstone by friction? Solve this problem using work-energy methods, not angular kinematics.

Two long straight current-carrying wires run parallel to each other. The current in one of the wires is 4.8 A, their separation is 4.7 cm and they repel each other with a force per unit length of 3.0 10 -4 N/m. Determine the current in the other wire.