College Physics

10th Edition

ISBN: 9781285737027

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 ball is falling toward the ground. Which of the following statements are false? (a) The force that the ball exerts on Earth is equal in magnitude to the force that Earth exerts on the ball, (b) The ball undergoes the same acceleration as Earth. (c) The magnitude of the force the Earth exerts on the ball is greater than the magnitude of the force the ball exerts on the Earth.

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Let us make the (unrealistic) assumption that a boat of mass m gliding with initial velocity v0 in water is slowed by a viscous retarding force of magnitude bv2, where b is a constant, (a) Find and sketch v(t). How long does it take the boat to reach a speed of v0/l000? (b) Find x(t). How far does the boat travel in this time? Let m = 200 kg, v0 = 2 m/s, and b = 0.2 Nm-2s2.

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A ball is falling toward the ground. Which of the following statements are false? (a) The force that the ball exerts on Earth is equal in magnitude to the force that Earth exerts on the ball, (b) The ball undergoes the same acceleration as Earth. (c) The magnitude of the force the Earth exerts on the ball is greater than the magnitude of the force the ball exerts on the Earth.

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A skater of mass 45.0 kg standing on ice throws a stone of mass 7.65 kg with a speed of 20.9 m/s in a horizontal direction. Find the distance over which the skater will move in the opposite direction if the coefficient of kinetic friction between the skater and the ice is 0.03.

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Two blocks of mass 3.50 kg and 8.00 kg are connected by a massless string that passes over a frictionless pulley (Fig. P4.47). The inclines are frictionless. Find (a) the magnitude of the acceleration of each block and (b) the tension in the string. Figure P4.47

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What net external force is exerted on a 1400-kg artillery shell fired from a battleship if the shell is accelerated at 300×104 m/s22.40×104 m/s2? What is the magnitude of the force exerted on the ship by the artillery shell?

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Shown are the forces acting on the box. Which of the folllowing is true:
Choices:
P = f and N = Fg
P = f and N >Fg
none of these
P >f and N f and N = Fg

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A hockey player slaps a puck into a cushion, which brings the puck to rest. If the puck's initial velocity was +40 m/s and it has a mass of 170 g, what force does the cushion apply to the puck? Assume the cushion acts on the puck for 0.03 s and the surface that the puck slides on is frictionless.

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A golf pro places a ball at rest on the tee, lines up his shot, draws back his club, and lets one rip. During the contact of the golf club with the golf ball, the force of the club on the ball is ____ the force of the ball on the club and the acceleration of the club is ____ than the acceleration of the ball.
a. greater than, greater than
b. greater than, equal to
c. greater than, less than
d. less than, less than
e. less than, equal to
f. less than, greater than
g. equal to, equal to
h. equal to, greater than
i. equal to, less than

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If the ball was in contact with the ground for exactly 0.15 seconds, which of the following gives the closest value of the magnitude of the force exerted by the ground on the ball?
111.5
50.2
63.6
141.4

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Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg, a) just after it is dropped from the window of a stationary train,
b) just after it is dropped from the window of a train running at a constant velocity of 36 km/h,

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As rockets, aircraft also satisfies Newton third law. To move in the direction of travel, the engine should push the air to the opposite direction of the aircraft's motion.
A) the force of the air and engine
b) the force of the earth on the engine
c) the force of the rocket engine on earth
d) the force of friction between the aircraft engine and air
e) the force of friction between aircraft and the engine

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