QUESTION 1 A driver in a car traveling at a speed of 28.8 m's sees a deer 100 m away on the road. Calculate the minimum constant acceleration that is necessary of the car to stop without hitting the deer (assuming the deer does not move). O -4.20 mis- O -1.75 m's O .2.80 m's2 O .3.50 m's2 QUESTION 2 A basketball player can jump 1.8 m off the hardwood floor. With what upward velocity did he leave the floor? O 1.4 m's O 2.8 m's 0 4.2 m's 5.6 m's QUESTION 3 Two stones are thrown from the top edge of a building with a speed of 20 m's, one straight down and the other straight up. The first one hits the street in a time ty- How much later is it before the second stone hits? 055 0 45 O not enough information. QUESTION 4 An object of what mass, acted upon by a net force of 20 N, will experience an acceleration of 10 mis-? O 2 kg O 200 kg. 1/2 kg. O 10 kg. QUESTION 5 A sled weighing 100 N is held in place on a frictionless 20 degree slope a rope attached to a stake at the top. The rope is parallel to the slope. What is the tension in the rope? 94.5 N O 47.ON O 378 N 342N QUESTION 6 Two blocks are released from the top of a building. One falls straight down while the other slides down a smooth ramp. If all friction is ignored, which one is moving faster when it reaches the bottom? O The block that went straight down. The block that went down the ramp. They both will have the same speed. O Insufficient information to work the problem. QUESTION 7 Which of the following are equivalent units for the rate of change of momentum with respect to time? O kg x mis2 O NE O N'SQUESTION & While moving in the positive-x direction, Mass 1 strikes Mass 2, which is initially at rest. After the collision Mass 2 moves off in the same direction and at the same speed Mass 1 had initially. Which of the following is true? Mass 2 is larger than Mass 1. O Mass 2 is the same size as Mass 1. O Mass 2 is smaller than Mass 1. QUESTION 9 A 75 kg swimmer dives horizontally off a 500 kg raft. If the diver's speed immediately after leaving the raft is 4.0 m's, what is the corresponding raft speed? O 0.20 m's. 0.50 m/'s. 0.60 m's. O 4.0 m's. QUESTION 10 If a two-body collision is not head-on, then which of the following may always be assumed? O Momentum is conserved. O Kinetic energy is conserved. O Both momentum and kinetic energy is conserved. O Neither momentum or kinetic energy is conserved. QUESTION 11 Mass 1 strikes Mass 2 while moving in the positive-x direction, which is initially at rest. After the collision M2 moves off in the same direction but at a greater speed. Which of the following is true? O Mass 2 is larger than Mass 1. Mass 2 is the same size as Mass 1 O Mass 2 is smaller than Mass 1. QUESTION 12 A 900 kg car travelling at 12 m/'s due east collides with a 600 kg car travelling at 24 m's due north. As a result of the collision, the two cars lock together and move in what final direction? 45.0' N of E O 53.1: N of E O 63.3" N of E O 60.5: N of E QUESTION 13 A 0.15 kg ball moving at 40 m's is struck by a bat. The bat reverses the ball's direction and gives it a speed of 50 m's. What average force does the bat apply to the ball if they are in contact for 6.0 x10 -s? 14 N 25 x 10 2 N 1.3 x 10 3N 2.3 x 10 3N QUESTION 14 A billiard bell moving at 5 m's strikes a stationary ball of the same mass. After the collision, the original ball moves at a velocity of 4.35 m's at an angle of 30" below its original motion. Find the velocity and angle of the second ball after the collision. 1.25 m's @ 31.20 1.44 m/s @ 60.00 2. 16 m/s @ 30.00 2.47 m/s @ 61.90QUESTION 15 The acceleration of an object undergoing uniform circular motion is constant in O magnitude only. direction only. D both magnitude and direction. O neither magnitude nor direction. QUESTION 16 A race car makes two laps around the track in 150 seconds (2.50 minutes). What is the car's average angular speed? O) 0.838 rad/'s. 0 0.168 rad/'s. O 0.200 rad/'s. O 0.248 rad/s. QUESTION 17 The blades of a fan running at low speed turn at 28.2 rad's. When the fan is switched to high speed, the rotation rate increases uniformly to 38.5 rad's in 5.75 seconds. What is the magnitude of the fan's angular acceleration? 3.22 rad/s 1.01 rad/s 2.01 rad/s2 O 1.79 rad/s QUESTION 18 A motor develops 56,000 watts of power when its shaft turns at 300 rad's. What is the torque on the shaft? O 30 N-m. O 187 N-m. O 17,000 N-m. O It depends on the shaft diameter. QUESTION 19 A wheel, initially at rest, has a moment of inertia of 2 kg-me. If a torque of 30 N-m is applied on the wheel for 10 seconds, how far will the wheel have turned? 750 rad. 1500 rad. 3000 rad. 6000 rad. QUESTION 20 A bucket filled with water has a mass of 23 kg and is attached to a rope, which in turn is wound around a 5 om radius cylinder at the top of a well. What torque does the weight of the water and bucket produce on the cylinder? (g = 0.81 mi's) O 33.7 N-m O 17.0 N-m O 11.3 N-m O 22.6 N-m QUESTION 21 A 40 kg boy is standing on the edge of a stationary 30-kg platform that is free to rotate without friction. The boy tries to walk around the platform in a counterclockwise direction. As he does, O the platform doesn't rotate. O the platform rotates in a clockwise direction just fast enough so that the boy remains stationary relative to the ground. " the platform rotates in a clockwise direction while the boy goes around in a counterclockwise direction relative to the ground. O both go around with equal angular velocities but in opposite directions.QUESTION 22 When an ice-skater spins and increases her rotation rate by pulling her arms and leg in, what happens to her kinetic energy? O It stays the same. It increases O It decreases QUESTION 23 A 0.400 kg mass, sitting on a horizontal frictionless surface, is attached to the end of a 0.750 m string. It is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 450 N, then what maximum velocity can the mass have if the string is not to break? O 375 m/'s O 22.4 m/s O 19.4 m/s O 20.0 m/s QUESTION 24 A grinding wheel with a moment of inertia of 2 kg-m- has a 2.50 N-m torque applied to it. What is its final kinetic energy 10 seconds after starting from rest? 312 J O 237 J 156 J O 106 J QUESTION 25 Astronauts orbiting the earth in the space shuttle experience a force of gravity that is O several times greater than the Fgrav experienced on Earth's surface. several times smaller than the Fgrav experienced on Earth's surface. a fraction greater than the Fgrav experienced on Earth's surface. O a fraction smaller than the Fgrav experienced on Earth's surface . O ... nonsense! Orbiting astronauts do not experience any gravitational pull from the earth. QUESTION 26 A space shuttle is in orbit about the earth at an altitude where the acceleration due to gravity is 8.70 m's. What is the shuttle's speed at this altitude? O 2.65 x 10 # m's 7.45 x 10 m/s O 7.68 x 10 # mis 7.91 x 10 m/s QUESTION 27 A 9 * 10 kg satellite with an orbital radius of 3.20 x 10 'm orbits the earth at an altitude of 2 56 x 10 m. What is the orbital period? 1. 11x 10 4 = O 4.12 x 104= 5.69 x 104 1.50 x 10 15 5QUESTION 28 A 50 N crate is pulled up a 5.0 m inclined plane by a worker at constant velocity. If the plane is incline at an angle of 37 to the horizontal and there exists a frictional force of 10 N between the crate and the surface, what is the force applied by the worker? O ON 20 N O 30 N O 40 N QUESTION 29 A girl and a boy pull in opposite directions on strings attached to each end of a spring balance. Each child exerts a force of 20 N. What will the reading on the spring balance be? O ON O 10 N O 20 N 0 40 N QUESTION 30 A horizontal force of 25 N is exerted on a box with a mass of 10 kg. The box accelerates at 2.0 m/'s". What is the magnitude of the frictional force acting between the box and the floor? O DON O 25 N O 5.0 N O 10 N QUESTION 31 A person lifts a heavy load to a vertical height of 2 meters in 3 seconds. If he/she had done this more slowly in 8 seconds, the work on the load would have been: O twice as great O four times as great the same O half as great QUESTION 32 A person standing on a scaffold lowers an object of weight 250 N by means of a rope, at constant speed. If the weight of the rope is negligible, the force that the person exerts is ... O constant and less than 250 N equal to 250 N O less than 250 N and decreasing O greater than 250 N QUESTION 33 A rock is thrown vertically upwards with a speed v from the edge of a cliff. At the same moment, a second rock is thrown vertically downwards with the same initial speed v. Which of the following statements regarding the motion of the rocks is true (ignore air resistance.)? O The rock which was thrown upwards reaches the bottom of the cliff with a higher velocity. O The rock which was thrown downwards reaches the bottom of the cliff with a higher velocity. O Both rocks reach the bottom of the cliff with the same velocity at the same time. O Both rocks reach the bottom of the cliff with the same velocity but at different times. QUESTION 34 A stone dropped from the top of a 80m high building strikes the ground at 40 m/'s after falling for 4 seconds. The stone's potential energy with respect to the ground is equal to its kinetic energy ... (use g = 10 m/s-) O at the moment of impact. O 2 seconds after the stone is released. O after the stone has fallen 40 m. O when the stone is moving at 20 m/'s.QUESTION 35 A stone is thrown with an initial speed of 12 m/s at an angle of 30% above the horizontal from the top edge of a cliff. If it takes the stone 5.8 s to reach the bottom, how far does the stone travel horizontally? Neglect air resistance. O 58 m 120 m D 150 m 200 m QUESTION 36 An object is suspended from a spring balance in a lift. The reading of the balance is 200 N when the lift is at rest. If the balance reading is 190 N, the lift is moving ... O downward at constant speed. downward and increasing in speed. O upwards at constant speed. O downward and decreasing in speed. QUESTION 37 At what height above the ground must a mass of 10 ky be to have a potential energy equal in value to the kinetic energy possessed by a mass of 10 kg moving with a velocity of 20 m's? (use g = 10 m/s-) O 10 m O 20 m ) 50 m O 100 m QUESTION 38 From which of the following may the acceleration of a body be calculated? O The change in position of a body when a resultant force acts on it. The rate of change in position of a body with time when a resultant force acts on it. O The change in velocity of a body when a resultant force acts on it. O The rate of change in velocity of a body with time when a resultant force acts on it. QUESTION 39 If during a given physical process the only force acting on an object is friction, which of the following must be assumed in regard to the object's kinetic energy? O It decreases. O It increases. O It remains constant. O It cannot be determined. QUESTION 40 The work done in lifting 80 kg of bricks to a height of 30 m on a building under construction is O 180 J O 1800 J O 1770 J O 17,700 J QUESTION 41 When an apple falls from a tree, it drops to the ground because of the gravitational force between the apple and Earth. Fy is the magnitude of the force exerted by the Earth on the apple and Fy is the magnitude of the force exerted by the apple on the Earth, then ... O they have equal inertia. O Fy is greater than F2 O Fy is smaller than F2. O Fy and Fy are equal.QUESTION 42 When we jump straight up, why do we land in our footsteps rather than at a location equal to the distance the Earth moves during our jump? O Actually, we do but the distance is too small to notice. () By Newton's First Law, we are already moving with the Earth before the jump and continue to move with the Earth during our jump. O By Newton's Third Law, we are pushing on the Earth, so it has to come back to us with the same amount of force. O The conservation of energy means there can be no motion because that would result in a change in the energy after we jump relative to our energy before we jump. QUESTION 43 Which one of the following expressions has the same units as power? force x distance work x time O force x acceleration O force x velocity