
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A boy throws a steel ball straight up. Consider the motion of the ball only after it has left the boy's hand but before it touches the ground, and assume that forces exerted by the air are negligible. For these conditions, the force(s) acting on the ball is (are):
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- A black aluminum glider floats on a film of air above a level aluminum air track. Aluminum feels essentially no force in a magnetic field, and air resistance is negligible. A strong magnet is attached to the top of the glider, forming a total mass of 240 g. A piece of scrap iron attached to one end stop on the track attracts the magnet with a force of 0.823 N when the iron and the magnet are separated by 2.50 cm. (a) Find the accelerationof the glider at this instant. (b) The scrap iron is now attached to another green glider, forming total mass 120 g. Find the acceleration of each glider when the gliders are simultaneously released at 2.50-cm separation.arrow_forwardTwo objects (m1=11.0 kg and m2=3.00 kg) are separated by 40.0 cm. A third object (m3=1.00 kg) is placed at a location along the line connecting them such that the net force acting on it is zero. By considering the force vectors, this location must be between the two original objects. We will define x as the distance between m1 and m3 and y as the distance between m2 and m3. 1) Find the distance between 11.0-kg object and 1.00-kg object along the line AB where a small, 1.00-kg object could rest such that the net gravitational force on it due to the two objects shown is exactly zero. (Express your answer to two significant figures.)arrow_forwardA boy of mass m = 36 kg is standing initially at rest relative to the moving walkway, which has a constant horizontal speed u = 1.1 m/s. He decides to accelerate his progress and starts to walk from point A with a steadily increasing speed and reaches point B (a distance s = 29 m) with a speed dx/dt = v = 2.5 m/s relative to the walkway. During his acceleration he generates an average horizontal force F between his shoes and the walkway. Calculate the work done on the boy by the force F from an absolute viewpoint and then from a relative viewpoint. Explain the difference. Answers: Absolute viewpoint, Work = i Relative viewpoint, Work = i Jarrow_forward
- A toy boat is being pushed with a force of 40.0 N [W] by its engines in a pond. A strong wind blows from the north, which exerts a force of 30.0 N on the boat. What is the net force acting on the ferry? Question 1 options: a 50.0 N [W 36.9° S] b 70.0 N [W 53.1° S] c 50.0 N [W 53.1° S] d 70.0 N [W 36.9° S]arrow_forwardA freight train consists of two 8.00×104 kg5.60×104 kg engines and 45 cars with average masses of 5.50×104 kg5.50×104 kg. (a) What force must each engine exert backward on the track to accelerate the train at a rate of 4.00×10−2 m/s if the force of friction is 6.20×105 N, assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently trains are very energy-efficient transportation systems. (b) What is the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?arrow_forwardNewton's Third Law. A student in elementary physics finds himself in the middle of a large ice rink with a small but finite coefficient of friction between his feet and the ice. He has been taught Newton's Third Law. Since the law says that for every action there is an equal and opposite reaction, all forces add up to zero. Therefore he assumes that there will be no force possible to accelerate him toward the side of the rink and so he must stay at the center. (a) How do you tell him to get to the side?arrow_forward
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