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Physics

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Nov 24, 2024

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Phy 101 Practice Exam #2 M ueller's Veggies 1.) After reaching cruising speed, the car pushing the truck now travels at a constant speed, and ________ a) the force of the car pushing against the truck is equal in amount to that of the truck pushing back against the car. b) the force of the car pushing against the truck is less than that of the truck pushing back against the car. c) the force of the car pushing against the truck is greater than that of the truck pushing back against the car d) the car's engine is running so it applies a force as it pushes against the truck but the truck's engine is not running so it can't push back with a force against the car. e) neither the car nor the truck exert any force on the other, the truck is pushed forward simply because it is in the way of the car. 2 .) How much impulse is required to stop a bowling ball (7kg) which is rolling at 3 m/s? a. 6.3 kg m/s toward the ball b. 21 kg m/s toward the ball c. 32 kg m/s toward the ball d. 147 kg m/s toward the ball e. 63 kg m /s toward the ball 3.) A rabbit (2 kg) must push down on the earth with a force of _____________ so that the earth can push back with a reaction force that allows the rabbit to jump over a water puddle in the yard. a) 20 kg d) 19.6 N b) less than 19.6 N e) more than 19.6 N c) more than 2 kg 4.) Which of the following statements about momentum is TRUE? a. If the momentum of a system is zero, nothing in the system is moving. b. A small child falling to the cement floor will experience a larger momentum change from the fall if he is wearing a padded diaper than if he is undressed. c. When a ball falls from a shelf, its momentum increases and yet it does not violate the law of conservation of momentum. d. On the rotating table, our brave student volunteers were able to make more spins with their arms and weights flung outward than when they pulled them in towards their bodies. e. A paddle boat docked at the pier has a greater momentum than a skiff motoring about the bay.

5.) Two Olympic skaters collide during practice. Bayul has a mass of 3.5 slugs and is standing still. Szewczenko has a mass of 5 slugs. If Szewczenko hits Bayul at a velocity of 5 ft/s to the left, what is the total final momentum of the two skaters as they move off together? a) 25 slugs ft/s to the left b) 17.5 ft/s to the right c) 42.5 slugs ft/s to the left d) 250 slugs ft/s to the left e) 50 ft/s to the right 6.) According to Newton's First Law of Motion, _______________ a) a body can be in motion if and only if it experiences a net external force. b) if there are any external forces acting on an object, it will not sit still. c) if the net external force acting on a body is zero, its state of motion will not change. d) if the net external force acting on a body is zero, it must be at rest. e) none of the above. V 1 = 28 cm/s V 2 = 12 cm/s v1 = ? v2 = ? Before: Collision: After: 7.) Two equal mass balls move as shown above, Ball 1 is moving at 28 cm/s to the right and Ball 2 is moving at 12 cm/s to the right. What are the velocities of the two balls after an elastic collision? a) Ball 1 moves at 28 cm/s to the right and Ball 2 moves at 12 cm/s to the right b) Ball 1 moves at 12 cm/s to the right and Ball 2 moves at 28 cm/s to the left c) Ball 1 moves at 28 cm/s to the left and Ball 2 moves at 12 cm/s to the right d) Ball 1 moves at 12 cm/s to the right and Ball 2 moves at 28 cm/s to the right e) The Balls will both come to a full and complete stop.

8.) If I hold a racquetball in my hand that weighs 9.8 N, what is the force acting on it when I release it (before hitting it with the racquet)? a) 9.8 m/s 2 e) 96 N b) 1 N c) 1 kg d) 9.8 N 9.) Two student groups are in a tug-of-war contest with a 400 kg lawnmower. If the Habitat group has 6 people pulling with 700 N each to the left and the College Students for Social Change group has 6 people pulling with 850 N each to the right, what is the lawn mower's acceleration? a) 10 m/s 2 toward the left b) 1.5 m/s 2 toward the right c) 3.0 m/s 2 toward the left d) 2.25 m/s 2 toward the right e) 0.75 m/s 2 toward the right 10.) An astronaut is in outer space and needs to fix something on the outside of the ship. He exits the ship in his space suit carrying the wrench needed for the repairs. If he is separated from his ship, how could he get back to it? a) He could "swim" through outer space kicking his feet in direction of ship. b) He could throw the wrench towards the ship. c) He could kick his feet in a direction away from the ship. d) He could throw his wrench away from the ship. e) None of the above

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