Physics Questions and Answers September 09, 2022

A metal bar moves through a magnetic field. The induced chargeson the bar are? Please Explain WHY

A metal bar moves through a magnetic field. The induced charges on the bar are A. B. C. D. V E.

Match the type of system or situation to the appropriate energy level diagram.

Match the type of system or situation to the appropriate energy level diagram. de electronic states of a single atom such as hydrogen OD b 10 a electronic, vibrational, and rotational states of a diatomic molecule such as 02 vibrational states of a diatomic molecule such as 02 rotational states of a diatomic molecule such as 02 idealized

Item 4 The two circuits in (Figure 1) use identical batteries and wires of equal diameters. Figure 1 2 0 3 3 1 of 1 11, Part A Rank in order, from largest to smallest, the currents I, I2. I3. and I4 at points 1 to 4. Rank from largest to smallest. To rank items as equivalent, overlap them. Largest ILI LA I 13 Reset Smallest Help

Make a spacetime diagram and draw worldlines for each of thefollowing situations.

A person driving by at a constant velocity of 100 kmhr. No elements selected Time (minutes) 120 80 40 120 90 60 30 .............. 30 2 90 ........... 120 Space (kilometers) 0 40 80 Select the elements from the list and add them to the canvas setting the appropriate attributes. Press TAB to get to the main menu.

PHYSICAL SCIENCE WORKSHEET CONSERVATION OF ENERGY 2 KEmy GPE mgh MEKE GPE 1.01345 1. Calculate the potential energy, kinetic energy, mechanical energy, velocity, and height of the skater at the various locations.no ME 18505 loo m60 kg v8 ms m50 kg PE O KE1939 ME19205 1443 PE KE ME v PE KE ME PE 538 KE1332 ME1925 82 2. Calculate the potential

What is the magnitude of the electric force on one of the masses?

Two 2.0 kg masses are 1.1 m apart (center to center) on a frictionless table. Each has 9.9 C of charge.

a) Consider an electron in a hydrogen atom. Describe the time evolution of a hermitian operator (with no explicit time dependence), corresponding to a particular observable for this quantum system. Further, state the time evolution of its eigenkets (base kets). Please give the relevant expressions in Schrdinger picture and Heisenberg picture. b)

A lightning bolt strikes a tree, moving 20.0 C of charge through a potential difference of 1.00 x 10 2 MV. a) What energy was dissipated? b) What mass of water could be raised from 15C to the boiling point and then boiled by this energy? c) Discuss the damage that could be caused to the tree by the expansion of the boiling water.

2. The pressure at the bottom of filled glass of water (p 103 kgm) is P. the water is poured out and the glass is filed with ethyl alcohol (p 806kgm). What will happen to the pressure at the bottom

3. An apple is held completely submerged just below the surface of water in a container. The apple is then moved to a deeper point in the water. Compared with the force needed to hold the apple just below the surface, what is the force needed to hold it at the deeper point

4. Place two cans of soft drinks, one regular and one diet, in a container of water. You will find that the diet drink floats while the regular one sinks. Use Archimedes principle to devise an explanation.

7. A large block of ice of thickness 5m has vertical hole drilled through it and is floating in the middle of a lake. What is the minimum length of the rope required to scoop up a bucket full of water through the hole (Density of ice is 0.9 x 10 kgm)

8. The relative velocity between two layers of water is 8ms. If the perpendicular distance between the layers is 0.1 m, calculate the velocity gradient.

9. A container is filled to a depth of 20.0 cm with water. On top of the water floats a 30.0cmthick layer of oil with specific gravity 0.700. What is the absolute pressure at the bottom of the container

12. Water flowing through a garden hose of diameter 2.74 cm fills a 25 L bucket in 1.50 min. a) What is the speed of the water leaving the end of the hose

31.A square plate of side 20cm moves parallel to another plate of with a velocity of 20cms both plates are immersed in water. If the viscous force is 4 x 10N and the viscosity is 0.001 decapoise, what is their distance apart

30.Calculate the horizontal force required to move a metal plate of area 2 x 102m with a velocity of 4.5 x 102ms when it rests on a layer of oil 1.5 x 10m thick. The coefficient of viscosity of oil is 2 Nsm

29.A piece of gold (p 19.3gcm) is suspected to be hollow from inside. It weighs 38.250g in air and 33.865g in water. Calculate the volume of the hollow portion of the gold, if any.

28. An object weighs 40N in air, weighs 20N when submerged in water and 30N when submerged in a liquid of unknown density. What is the density of the liquid

26.A household hot water heating system has an expansion tank of 12m above the boiler. If the tank is open to the atmosphere, calculate the gauge and absolute pressure in the boiler.

25. Two pistons of a hydraulic lift have diameters 30cm and 2.5cm. What is the force exerted by the larger piston when 50kg weight is placed on the smaller piston If the stroke of the smaller piston is 4cm, through what distance will the larger piston move after 10 strokes

24. A force of 50N is applied to the input piston of a hydraulic system. The input system has an area of 60cm and the output piston has an area of 15cm i) Find the force the output piston exerts,ii) Find the distance the output piston moves

23.Show that pressure on the bottom of a vessel filled with liquid does not depend upon the area of the liquid surface.

22. What is the weight of one litre ethanol if the specific gravity of ethanol is 0.79

21.If a 2N stone sinks after being dropped into the lake, what is the buoyant force of the stone

18. Water flows in 6 cm diameter pipe with a flow rate of 0.06ms. the pipe reduced in diameter to 2.8 cm. calculate the maximum velocity and mass flux. Assuming uniform velocity profiles.

32.The flow rate of water from a tap of diameter of 1.25 cm is 3 litres per minute. The coefficient of viscosity of the water is 10pas. Characterize the flow.

34. A pipe is running full of water. At a certain point A, it tapers from 60cm to 20cm diameter at B. The pressure difference between A and B is 100cm of water column. Find the rate of flow of water through the pipe.

35. The reading of a manometer fitted to a closed tap is 3.5 x 105 Nm. If the valve is opened, the reading of the manometer falls to 3 10 Nm. Calculate the velocity of water.

37. Water enters a house through a pipe 4cm in inside diameter at an absolute pressure of 8 x 105 pa. The pipe leading to the second flow bathroom is above 10m and it is 2cm in diameter and the flow velocity at the inlet is 8ms. Calculate

38. Water is flowing in a fire house with a velocity of 1ms and a pressure of 200000pa. at the nozzle, the pressure decreases to atmospheric pressure, there is no change in height. Find the velocity of water exiting the nozzle.

39. Water is conveyed at a volumetric rate of 4.8 x 102ms through a pipeline as shown in figure 2. The internal diameter of the pipeline at sections 2 is 5.84cm and loss in head 4m. Determine the diameter(cm) of the pipeline at section 1, if all losses encountered through the pipeline are due to kinetic head loss.,Qu Section 1 Section 2 Figure 2 A

48. Why is it difficult to stop bleeding from a cut in the body at high altitude

53.A metal plate 5 cm by 5 cm rests on a layer of castor oil 1 mm thick whose coefficient of viscosity is 1.55 Nsm Calculate the magnitude of applied force with a speed of 2cms. EN

54.A tank 5 m high is half filled with water and then filled to the top with oil of density 0.85 gcm. What is the pressure at the bottom of the tank due these liquids

55.A queens gold crown has a mass of 1.30 kg. When it is weighed while completely immersed in water, its apparent mass is 1.14 kg. Determine if crown is a solid gold.

57.A piece of wood of relative density 0.25 floats in a pail containing oil of relative density 0.81. What percentage of volume of the wood is above the surface of oil

58.At what velocity does water emerge from an orifice in a tank in which gauge pressure is 3 x 10Nm before the flow starts

59.The reading of a manometer fitted to a closed tap is 3.5 x 105 Nm. Calculate the velocity of water after the valve is opened given that the reading of the manometer falls to 3 x 10 Nm.

61.A cylindrical rest on a platform 1 m high. Initially the tank is filled with water to a height (h) of 0.5 m. A plug whose area is 104 m is removed from an orifice on the side of the tank. Calculate (i) initial speed of with which water flows from orifice and (ii) the speed with which water strikes the ground.,1.00 m 0.600 m Figure 2.

62.A water bed is 2m on a side and 30cm deep. (a) Find weight (b) Find the pressure that the water bed exerts on the floor. Assume that the entire lower surface of the bed makes contact with the floor.

63. In a huge oil tanker salt water has flooded on oil tank to a depth of 5m. On top of the water is a layer of oil 8m deep. The oil has a density of 0.700gcm. Find the pressure at the bottom of the tank. (Density of salt water is 1.025kgm)

64.Calculate the net force exerted on your eardrum due to the water above when you are swimming at the bottom of a pool that is 5m deep. (Assuming that the area of eardrum is 1cm)

65.A hydraulic lift has pistons with diameters 8cm and 36cm respectively. If a force of 825N is exerted at the input piston, what is the maximum mass.

67.A 1.0 kg block of aluminum with 2.1 10 kgm densities has tied with one rope and submerged into container where filled with water. Determine (a) The tension of rope while hanging freely (b) The tension of rope while submerged into container

68.A small pipe has a diameter 4cm connected to another pipe where its diameter is 4 times more than the first pipe. If the sea water flows through this small pipe with velocity 6ms and its pressure 200kPa, determine (a) Velocity and pressure at big pipe. (b) The flow rate of the sea water in the whole pipe

69. Water is flowing through a pipe of 5cm diameter under a pressure of 29.43Ncm (gauge) and with mean velocity of 2ms. Find the total head or total energy per unit weight of the water at the cross section which is 5m above the datum line.

70.A pipe through which water is flowing is having diameters 20cm and 10cm at the cross sections 1 and 2 respectively. The velocity of water at section 1 is given by 4ms. Find the velocity head at sections 1 and 2.

71. Water flows steadily along a horizontal pipe at the rate of 810 ms. If the crosssection area of the pipe is 4010 m, Calculate the (a) Flow velocity of water (b) Total pressure in the pipe if the static pressure in the horizontal pipe is 3x10pa (Density of water is 1000kgm) (c) New flow velocity if total pressure is 3.610 pa.

73.A pipe through which water is flowing is having diameters 40cm and 20cm at the cross sections 1 and 2 respectively. The velocity of water at section 1 is given by 5.0ms. Find the velocity head at the sections 1 and 2. And also the find the rate of discharge.

74.The water is flowing through a pipe having diameters 20cm and 15cm at sections 1 and 2 respectively. The rate of flow through a pipe is 40litress. The section 1 is 6m above the datum line and section 2 is 3m above the datum. If the pressure at section 1 is 24.43Ncm, Find the intensity of pressure at section 2.

75.A pipe of diameter 30cm carries water at velocity of 20ms. The pressures at the points A and B are given as 34.335Ncm and 29.43Ncm respectively, while the datum head at A and B are 25m and 28m. Find the loss of head between A and B.

76.A patient receives a blood transfusion through a needle of radius 0.20 mm and length 2.0 cm. The density of blood is 1 050 kgm. The bottle supplying the blood is 0.50 m above the patients arm. What is the rate of flow through the needle (viscosity of blood is 2.7 x 10N.sm)

77. A water hose 2.50 cm in diameter is used by a gardener to fill a 30.0liter bucket. (One liter1 000 cm.) The gardener notices that it takes 1.00 min to fill the bucket. A nozzle with an opening of crosssectional area 0.500 cm is then attached to the hose. The nozzle is held so that water is projected horizontally from a point 1.00 m above the

78.The Engineering field water tunnel at Bunda college has a circular cross section that constricts from a diameter of 3.6 m to the test section, which is 1.2 m in diameter. If the speed of flow is 3.0 ms in the largerdiameter pipe, determine the speed of flow in the test section.

79.Each second, 5 525 m of water flows over the 670mwide cliff of the Horseshoe Falls portion of Niagara Falls. The water is approximately 2 m deep as it reaches the cliff. Estimate its speed at that instant

80.A 1.0010kg cube of aluminum is placed in a tank. Water is then added to the tank until half the cube is immersed. (density of Aluminum 2.70 10 kgm) (a) What is the normal force on the cube (See Fig. 9.25a.) (b) Mercury is now slowly poured into the tank until the normal force on the cube goes to zero. (See Fig. 9.25b.) How deep is the layer

5) Ten bricks, each 6.0 cm thick and mass 1.5 kg, lie flat on table. How much work is required to stack them one on the top of another

6) A 70 kg man runs up a long flight of stairs in 4.0 s. The vertical height of the stairs is 4.5 m. Calculate his power output in watts.

8) 100 m of water is pumped from a reservoir into a tank, 10 m higher than reservoir, in 20 minutes. If density of water is 1000kgm, find a) The increase in P.E. b) The power delivered by the pump.

10) A car of mass 800 kg travelling 54kmh is brought to rest in 60m. find the average retarding force on the car. What happened to original kinetic energy

11) A brick of mass 2.0 kg is dropped from a rest position 5.0 m above the ground. What is its velocity at a height of 3.0 m above the ground

12) A diver weighing 750 N dives from a board 10 m above the surface of a pool water. Use the principle of mechanical energy to find his speed at a point above the water surface, neglecting the air friction.

13) A 1000 kg automobile at the tip of an incline 10 m high and 100m long is released and rolls down the hill. What is its speed at,the bottom of the incline if the average retarding force due to friction is 480 N

14) A child starts from rest at the top of a slide of height 4.0 m. a) What is his speed at the bottom if the slide is frictionless,b) If he reaches the bottom, with a speed of 6ms, what percentage of his total energy at the top of the slide is lost as a result of friction

22) What power in kW is supplied to 15horse power motor having an efficiency of 90 when it is delivering its full rated output

52) A body of mass 0.3 kg is taken up an inclined plane of length 10 m and height 5m and then allowed to slide down to the bottom again. The coefficient of friction between the body and plane is 0.15. Calculate work done by the applied force over the upward journey.

56) A pump on the ground floor of a building can pump up water to fill a tank of volume 30 m in 15 min. If the tank is 40 m above the ground, and the efficiency of the pump is 30, how much electric power is consumed by the pump.

57) An engine of 98 kilowatts power is used to pump water from a mine 50 metres deep. Calculate the quantity of water in kilolitres which it can pump out in one hour.

66) Jackscrew has a lever arm of 40 cm and a pitch of 5mm. If the efficiency is 30, what force F, is required to lift a load W of 270kg

67) A student designed a jackscrew for pressing to tobacco bells. If the pitch of the screw is 4mm, the lever arm is 50 cm and the jackscrew is 80 efficient, find the values of the force required to press a 200kg load. Solution effort load oil

72) A screwjack is being used to support the axle of a lorry, the load on it being 5.6 kN The screw jack has an effort of effective radius 318.3 mm and a single start square thread, having a lead of 5 mm. Determine the efficiency of the jack if an effort of 70 N is required to raise the car axle.

74) A simple machine raises a load of 160 kg through a distance of 1.6 m. The effort applied to the machine is 200 N and moves through a distance of 16 m. Taking g as 9.8 ms2, determine the force ratio, movement ratio and efficiency of the machine.

a) work output b) power output and input c) efficiency of engine

76) A hosting machine lifts a 3000kg load a height of 8.00m in a time of 20.0s. The power supplied to the engine is 18.0hp. Compute

i) 100% ii) 60%

78) With a certain machine, the applied force moves 3.3cm to raise a load 8.0cm. Find the a. IMA

80) A certain hydraulic jack in the gas station lifts a 900kg car a distance of 0.25cm when a force of 150N pushes a piston through a distance of 20cm. Find the AMA, IMA and efficiency.

79) The screw of a certain press has a pitch of 0.20cm. The diameter of the wheel to which a tangential turning force F is applied is 55cm. if the efficiency is 40, how large must F be to produce a force of 12kN in the press.

A force 1000 N stretches the length of a hanging wire by 1 mm. What force is required to stretch a wire of the same material and length but having four times the diameter of 1 mm.

What percentage length of a wire will increase by applying a stress of 9.8 Nmm on it given that Y 1 x 1011 Nm Conversion 1mm 1 x 106 m Stress 9.8N(1 x 106 m) 9.8 x 106 Nm

10. Figure 1, shows a body of mass m lying on a smooth, horizontal surface and connected by a massless rope, which hangs over a smooth, massless pulley to a second body of mass m. Find the acceleration of the bodies and the stretching force or tension T in the string given that m 2 kg and m 3 kg

11. A 5kg block is given a shove so that it starts to slide to the right in Figure 2 across a rough, horizontal surface at an initial speed of u 4.0 ms. If the coefficient of sliding friction 0.2, what distance will it travel before coming to rest Mk N mg

A child starts out at rest at the top of a 45slide having a total length of 7.0 meters as shown in Figure 3. If the coefficient of friction between the child and the slide is 0.15, calculate the 12.,Figure 3 a. Childs acceleration down the plane,b. Childs velocity at the bottom

b. 90 O

13. A force of 36 N is applied to a particle located at 0.15m from the axis of rotation. What is the magnitude of torque about the axis, if the angle between the direction a. 60 of the applied force and the radius vector is

A metre stick is balanced on a knife edge at its centre. When two coins, each of mass 5 g are put one on top of the at the 12.0 cm mark, the stick is found to be balanced at 45.0 cm. What is the mass of the metre stick 15. 0cm 0cm 12cm 33cm 10g 50cm 5cm, 45cm 50cm 100cm 100cm

Electric Power is the product of Electric Current and Voltage, ???? = ????????. Show that Electric Power is also given as the product of Force and velocity of the electric charges, ???? = ???? v

A gardener moves a lawn roller through a distance of 50 m with a force of 50N inclined at an angle of 60 to the direction of motion. Calculate his wages of doing the above work, if he is to be paid K200 on every 25J of work.

How much work is needed to push a 1250kg cart 11.5 m up the inclined plane at 13.5 at constant velocity, if the coefficient of friction is 0.09

. Consider a 10 gram bullet passing through a 3.0 kg block resting on a table. The velocity of the bullet is 400 ms on entering the block and 250 ms on exit. Calculate a. The energy lost by the bullet in passing through the block.,b. If 30 of the energy lost is used to move the block along a surface with coefficient of friction 0.80, how far will

The efficiency of a Carnot cycle is 16. If on reducing the temperature of the sink 75 C, the efficiency becomes 13, determine the initial and final temperatures between which the cycle is working.

A student is trying to decide what to wear. His bedroom is at 20.0 C. His skin temperature is 35.0 C. The area of his exposed skin is 1.50m. People all over the world have skin that is dark in the infrared, with emissivity about 0.900. Find the net energy transfer from his body by radiation in 10.0 min

A 25 kg box is placed at rest on a horizontal surface. Now, 100 N force is applied on the box in direction of 30 degrees below horizontal. If the coefficient of kinetic friction is 0.2, determine time it takes to move 55m.

Q. When Zload 5050j and ZT.L 155 ohm 1) Find Normalization ZI and YI 2) Find Distance VL 3) Find Distnce IL Using Smith chart Show all works

1. The fundamental problem in harnessing nuclear fusion is getting the two particles (say, two deuterons) close enough together for the attractive (but shortrange) nuclear force to overcome the Coulomb repulsion. The brute force method is to heat the particles to fantastic temperatures and allow the random collisions to bring them together. A more

2) A ball is thrown up with initial velocity and initial angle toward the wall.it hits the wall with only tangent velocity. The horizontal distance from projected point to the wall is 13.0 m and the height from the ground and hitting point on the wall is 15 meters. What is initial velocity and initial angle of the ball

Determine the deflection and slope at point C. Consider El is constant. a. Using Castiglianos Theorem (10pts.) b. Using Virtual Work Method (10pts.) A TATT 6m B 1.5 kNm TI II 4m H

9.1. Consider a single runway airport whose most demanding aircraft are in FAA approach category D and airplane design Group V. It has a long linear passenger building running parallel to the runway, with contact stands on the side of the building facing the runway. There are 14 contact stands 5 can accommodate the Boeing 747400, 4 the Boeing

Question A jet aircraft is travelling at 228 ms in horizontal flight. The engine takes in air at a rate of 47.8 kgsec and burns fuel at a rate of 3.12 kgs. The exhaust gases are ejected at 631 ms relative to the aircraft. a) b) Find the thrust of the jet engine. Find the delivered power.

Consider the following application of monopolistic competition in trade. Firms in an industry face monopolistic competition and the (residual) demand function facing a firm is: where Q is the quantity of output demanded, S is the total output of the industry, n is the number of firms in the industry, b is a positive constant term representing the

xS0 bx (PP)

Heat amounting to 845 J is added to a 0.200 kg block of aluminum at 312.00 K. How high will the temperature of the aluminum rise (specific heat of aluminum 903JkgK) 4.68 K

5. How much energy does it take to turn 15 kg of ice at 10C into steam Consider heats as Lf333 kJkg and Lv 2256 kJkg. Ans 45 MJ