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Exam 2: Newtons Laws

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Question 31

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The acceleration of a body is

A) always in the same direction as its velocity.
B) always in the same direction as the net force on the body.
C) in the direction that the body is moving.
D) equal to the net force on the body.
E) none of the above.

F) A) and C)
G) B) and C)

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Question 32

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​Match each item with the correct statement below.​ -the volume of a 5 lb bag of sugar

A) m
B) m²
C) m³
D) s
E) Hz
F) m/s
G) m/s²
H) N
I) kg

J) A) and H)
K) A) and B)

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Question 33

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A 188-pound astronaut in a training exercise experiences an acceleration of 7.2 g's.What is the net force (in newtons) acting on the astronaut?

A 160 lb person has a mass of 160/32 = 5 slugs.A 160-lb person steps into an elevator and stands on a bathroom scale.Determine the scale reading for the given scenarios. -The elevator is accelerating downwards at 2 ft/s².

Tides are caused because different parts of the Earth's oceans are at different distances from the Moon.

A satellite orbits the Earth at a distance of 10,000 miles from the Earth's center.At this distance the force of gravity on the satellite is 90 lbs. (a)What would the force on the satellite be if the distance were 5,000 miles instead? (b)At what distance from the Earth's center would the force on the same satellite be 10 lbs?

​Match each item with the correct statement below.​ -needed to make an object move in a circle

An aircraft starts at rest and is accelerated at 10 m/s² for 30 seconds,at which time the aircraft becomes airborne.What is the distance traveled during the 30 seconds? Assume the acceleration is constant.

You stand on a bathroom scale at the equator and at the north pole.The scale reading at the equator is _______________ the scale reading at the north pole.

The SI units of acceleration are

For this situation, I push on a heavy chair. -Suppose I push moderately on the chair,and this time the chair does move.Then the strength of the force the chair exerts on me is

The horizontal speed of a projectile

The net force points downward.

A child on a merry-go-round is moving with speed 4 m/s in a circle with radius 2 m.If the child's mass is 30 kg,what is the centripetal force?

A 160 lb person has a mass of 160/32 = 5 slugs.A 160-lb person steps into an elevator and stands on a bathroom scale.Determine the scale reading for the given scenarios. -After moving upwards at constant speed,the elevator is slowing down at 2 m/s² as it is coming to rest.

An aircraft weighs 1,500 N,its mass is

Two identical airplanes are executing identical turns around a pylon.One of them is moving at 200 mph,and the other is moving at 100 mph.The centripetal force acting on the airplane moving at 200 mph is __________ the value of the centripetal force acting on the airplane moving at 100 mph.

​Match each item with the correct statement below.​ -a measure of an object's resistance to acceleration

With a fixed force,you will impart the same acceleration to a body on the Earth and on the Moon.

​Match each item with the correct statement below.​ -the quantity describing how the speed of your car changes