The Physical World: Chapter 4-5
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What is the net force acting on a falling 1-kg ball if it encounters 2 N of air resistance?
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7.80 N
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A coconut and a feather fall from a tree through the air to the ground below. The amount of air-resistance force is greater on the feather. greater on the coconut. the same on each.
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greater on the coconut
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Consider a business jet of mass 28000kg in takeoff when the thrust for each of two engines is 26000N .Find its acceleration
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1.9 m/s^2
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Leroy, who has a mass of 100kg , is skateboarding at 9.2m/s when he smacks into a brick wall and comes to a dead stop in 0.2 s. find his deceleration
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46 m/s^2
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Leroy, who has a mass of 100kg , is skateboarding at 9.2m/s when he smacks into a brick wall and comes to a dead stop in 0.2 s. Find the force of impact
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4600 N
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Calculate the weight in newtons of a person having a mass of 44kg
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440 N
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If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity ANSWER: the object accelerates opposite the direction of the applied force. the object accelerates in the direction of the applied force. the friction force increases. two of the above none of the above
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the object accelerates in the direction of the applied force
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A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the ANSWER: muscular effort in the player's arms. player's grip on the glove. force the glove exerts on the ball. friction of the ground against the player's shoes. none of these
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force the glove exerts on the ball
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A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is ANSWER: 1000 N. less than 1000 N. more than 1000 N. impossible to determine.
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1000 N
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As a ball falls, the action force is the pull of Earth on the ball. The reaction force is the ANSWER: acceleration of the ball. air resistance acting against the ball. pull of the ball's mass on the Earth. none of these
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pull of the ball's mass on the Earth
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The force exerted on the tires of a car to directly accelerate it along a road is exerted by the ANSWER: engine. road. air. tires. none of these
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Road
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A piece of rope is pulled by two people in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope? ANSWER: 600 N 800 N zero 400 N none of these
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400 N
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Calculate the resultant velocity of an airplane that normally flies at 230km/h if it encounters a 52-km/h wind from the side (at a right angle to the airplane).
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240 km/h
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A boxer punches a sheet of paper in midair and brings it from rest up to a speed of 26m/s in 0.040s . what acceleration is imparted to the paper?
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650 m/s^2
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A boxer punches a sheet of paper in midair and brings it from rest up to a speed of 26m/s in 0.040s .If the mass of the paper is 0.003 kg, what force does the boxer exert on it?
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2.0 N
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A boxer punches a sheet of paper in midair and brings it from rest up to a speed of 26m/s in 0.040s . How much force does the paper exert on the boxer?
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2.0 N
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If you stand next to a wall on a frictionless skateboard and push the wall with a force of 32N , how hard does the wall push on you?
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32 N
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If you stand next to a wall on a frictionless skateboard and push the wall with a force of 32N , how hard does the wall push on you? If your mass is 78kg , find your acceleration.
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.41 m/s^2
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Forces of 3.6N and 4.0N act at right angles on a block of mass 2.2kg . Find the acceleration of the block.
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2.4 m/s^2
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A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is the same for both. greater on the bug. greater on the car.
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the same for both
