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Exam 3: Newtons Laws of Motion

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Question 31

Multiple Choice

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On the surface of Jupiter, where the acceleration due to gravity is about three times that of Earth, a 100-kg rock would have a mass of about

A) 100 kg.
B) 300 kg.
C) 600 kg.
D) 900 kg.

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Question 32

Multiple Choice

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When a rock thrown straight upward gets to the exact top of its path, its velocity is

A) zero and its acceleration is zero.
B) zero and its acceleration is about 10 m/s2.
C) about 10 m/s and its acceleration is zero.
D) about 10 m/s and its acceleration is about 10 m/s2.
E) none of the above

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Question 33

Multiple Choice

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A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is

A car has a mass of 1000 kg and accelerates at 2 m/s2. What is the magnitude of the force exerted on the car?

A skydiver who weighs 500 N reaches terminal velocity of 90 km/h. The air resistance on the skydiver is then

What is the minimum amount of thrust necessary for a vertically fired rocket to leave the launching pad? Can this thrust be reduced as the rocket gains speed? Explain.

A pair of tennis balls fall through the air from a tall building. One ball is ordinary and the other is filled with lead pellets. The ball to reach the ground first is the

A bag of groceries has a mass of 10 kg and a weight of about

A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level compared to its initial speed is

If an object's mass is decreasing while a constant force is applied to the object, the acceleration

The force that allows you to walk is

Arnold Strongman and Suzie Small have a tug-of-war on a polished floor. Arnold wears socks and Suzie wears gym shoes. The likely winner is

A falling object that has reached its terminal speed continues to gain

Newton's laws would not apply to

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the

A person is attracted toward the center of Earth by a 500-N gravitational force. The force of attraction of Earth toward the person is

A skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about

A rock is thrown vertically into the air. At the very top of its trajectory, the net force on it is

A 10-kg block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block in meters per second squared is

A 10-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is