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Exam 2: Force

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Question 21

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An object with a mass of 200.0 kg is 500.0 Km above the surface of the earth.The force of gravity on the 200.0 kg mass is (G = 6.67 $\times$ 10^-11 N m²/kg²,radius of the earth is 6.38 $\times$ 10⁶ m,mass of earth is 5.98 $\times$ 10²⁴ kg)

A) 2.02 $\times$ 10³ N.
B) 1.69 $\times$ 10³ N.
C) 1.42 $\times$ 10³ N.
D) 1.28 $\times$ 10³ N.
E) 1.05 $\times$ 10³ N.

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Question 22

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The gravitational field at the earth due to the moon is (the mass of the moon is 7.35 $\times$ 10²² kg,the distance to the moon is 3.85 $\times$ 10⁸ m)

A) 2.90 $\times$ 10^-5 N/kg toward the moon.
B) 3.31 $\times$ 10^-5 N/kg away from the earth.
C) 4.01 $\times$ 10^-5 N/kg toward the moon.
D) 5.91 $\times$ 10^-5 N/kg away from the earth.
E) 7.50 $\times$ 10^-5 N/kg toward the moon.

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Question 23

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When an object is in translational equilibrium,which of these statements is not true?

A car is driving on a level highway.It is acted upon by the following forces: a downward gravitational force of 12 kN,an upward contact force due to the road of 12 kN,another contact force due to the road of 7 kN directed West,and a drag force due to air resistance of 5 kN directed East.What is the net force acting on the car?

A force of 451 N is applied to 111 kg box that has a coefficient of static friction of 0.450.What is the force of friction on the box?

The fundamental force that governs the motion of the planets is

Two dogs are pulling on opposite ends of a bone,each with a force of 150N,in opposite directions along the length of the bone.What is the tension in the bone?

A man who weighs 600 N is sitting in a chair with his feet on the floor and arms resting on the armrests.The chair weighs 100 N.Each armrest exerts an upward force of 25.0 N on his arms,and the seat exerts an upward force of 500 N.What force does the floor exert on his feet?

A person weighs 155 pounds.What is the person's weight in Newtons?

Diane (weight 255 N) is practicing on a tightrope that is 6.00 meters long and sags by 0.120 meters.When she is in the middle of the rope,what is the force on each eyebolt holding the tightrope?

The weight of a 1.00 kg on the surface of the moon is (G = 6.67 $\times$ 10^-11 N m²/kg²,R of the moon is 1.74 $\times$ 10⁶ m,mass of the moon is 7.35 $\times$ 10²² kg)

A 90.0 N crate of apples sits at rest on a ramp that runs from the ground to the bed of a truck.The ramp is inclined at $20^{\circ}$ to the ground.What is the force exerted on the crate by the ramp?

Given that a vector extends from the origin to (-5.0 cm,8.0 cm) ,find the direction of the vector from the positive x-axis.

A box is pushed across a horizontal table by a boy applying a force of 32 N to the box.A force of friction of magnitude 19 N acts opposite the direction of motion.A stiff wind also opposes the box's motion.What force does the box exert on the boy's hand?

A force of 3.8N directed along the positive x-axis combines with a second force directed along the positive y-axis to produce a total force vector of magnitude 6.1N.What is the magnitude of the second vector?

The net force on a moving object suddenly becomes zero.The object then

When a force is called a "normal" force,it is

The force that holds charged atoms together is

A 750 N box moves at a constant velocity on a floor with a coefficient of static friction = 0.800 and coefficient of kinetic friction = 0.600.What horizontal force is required to keep the box moving?

A space probe leaves the solar system to explore interstellar space.Once it is far from any stars,when must it fire its rocket engines?