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Exam 2: Motion in One Dimension

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Question 1

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John throws a rock down with speed 14 m/s from the top of a 30-m tower.If g = 9.8 m/s² and air resistance is negligible,what is the rock's speed just as it hits the ground?

A) 12 m/s
B) 28 m/s
C) 350 m/s
D) 784 m/s

E) A) and C)
F) All of the above

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Question 2

Multiple Choice

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Consider the magnitude of the average speed, ,and the magnitude of the average velocity, ,for the same trip.Which of the following is always true?

A)
B)
C)
D) none of the above

E) B) and C)
F) C) and D)

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Question 3

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In one-dimensional motion where the direction is indicated by a plus or minus sign,the average velocity of an object has which of the following properties?

A strobe photograph of a car moving along a straight road shows the interval between each successive image to be diminishing.If the direction of motion of the car is taken as positive,which of the following are negative?

A baseball catcher throws a ball vertically upward and catches it in the same spot when it returns to his mitt.At what point in the ball's path does it experience zero velocity and non-zero acceleration at the same time?

A strobe photograph shows equally spaced images of a car moving along a straight road.If the time intervals between images is constant,which of the following cannot be positive?

A truck moves 70 m east,then moves 120 m west,and finally moves east again a distance of 90 m.If east is chosen as the positive direction,what is the truck's resultant displacement?

A bird,accelerating from rest at a constant rate,experiences a displacement of 28 m in 11 s.What is the final velocity after 11 s?

At the top of a cliff 100 m high,Raoul throws a rock upward with velocity 15.0 m/s.How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff?

An object is dropped from a height.Once it is moving,which of the following statements is true,at least at one point?

Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground.If air resistance is negligible,which statement best applies?

A vehicle designed to operate on a drag strip accelerates from zero to 30 m/s while undergoing a straight line path displacement of 45 m.What is the vehicle's acceleration if its value may be assumed to be constant?

Jeff throws a ball straight up.For which situation is the vertical velocity zero?

Mt.Everest is more than 8 000 m high.How fast would an object be moving if it could free fall to sea level after being released from an 8000-m elevation? (Ignore air resistance. )

A water rocket,launched from the ground,rises vertically with acceleration of 30 m/s² for 1.0 s when it runs out of "fuel." Disregarding air resistance,how high will the rocket rise?

The distance of the Earth from the sun is 93 000 000 miles.If there are 3.15 ´ 10⁷ s in one year,find the speed of the Earth in its orbit about the sun.

The value of an object's acceleration may be characterized in equivalent words by which of the following?

A ball of relatively low density is thrown upwards.Because of air resistance the acceleration while traveling upwards is -10.8 m/s².On its trip downward the resistance is in the opposite direction,and the resulting acceleration is -8.8 m/s².When the ball reaches the level from which it was thrown,how does its speed compare to that with which it was thrown?

A rock is thrown straight up with an initial velocity of 24.5 m/s.What maximum height will the rock reach before starting to fall downward? (Take acceleration due to gravity as 9.80 m/s². )

Displacement is which of the following types of quantities?