FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 2: Motion in One Dimension

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 31

Multiple Choice

Review LaterAdd Note

Review Later

A package is dropped from a helicopter moving upward at 15 m/s.If it takes 16.0 s before the package strikes the ground,how high above the ground was the package when it was released? (Disregard air resistance. )

A) 1000 m
B) 1500 m
C) 810 m
D) 1200 m

E) A) and B)
F) B) and C)

Correct Answer

verified

Show Answer

Question 32

Multiple Choice

Review LaterAdd Note

Review Later

A test rocket is fired straight up from rest with a net acceleration of 20 m/s².After 4 seconds the motor turns off,but the rocket continues to coast upward.What maximum elevation does the rocket reach?

A) 487 m
B) 327 m
C) 320 m
D) 408 m
E) 160 m

F) C) and D)
G) B) and D)

Correct Answer

verified

Show Answer

Question 33

True/False

Review LaterAdd Note

The equation sf = si + vis Δt + as (Δt)² is valid for all types of motion because it is a fundamental equation of physics.

You go on a long trip and try to determine your average velocity by using the miles on your car's tripometer and the time the trip required.Why would the answer using this information most likely not be correct?

A bicyclist starts a timed race at 6.0 mi/h.In order to win,he must average 21 mi/h.Assuming constant acceleration from the start,how fast must he be traveling at the end of the race?

An airplane needs to reach a velocity of 203.0 km/h to take off.On a 2000 m runway,what is the minimum acceleration necessary for the plane to take flight?

A motorist makes a trip of 180 miles.For the first 90 miles she drives at a constant speed of 30 mph.At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?

A ball is projected upward at time t = 0.0 s,from a point on a roof 60 m above the ground.The ball rises,then falls and strikes the ground.The initial velocity of the ball is 28.4 m/s.Consider all quantities as positive in the upward direction.At time t = 4.3 s,the acceleration of the ball is closest to:

Two identical objects A and B fall from rest from different heights to the ground.If object B takes twice as long as A to reach the ground,what is the ratio of the heights from which A and B fell? Neglect air resistance.

It is physically impossible for an object to have a negative acceleration and yet be speeding up.

A dragster travels 1/4 mi in 6.7 s.Assuming that acceleration is constant and the dragster is initially at rest,what is its velocity when it crosses the finish line?

The motions of a car and a truck along a straight road are represented by the velocity-time graphs below.The two vehicles are initially alongside each other at time t = 0. At time T,what is true of the distances traveled by the vehicles since time t = 0?

A baseball is hit with a bat and,as a result,its direction is completely reversed and its speed is doubled.If the actual contact with the bat lasts 0.45 s,what is the ratio of the acceleration to the original velocity?

A toy rocket is launched vertically from ground level (y = 0 m) ,at time t = 0.0 s.The rocket engine provides constant upward acceleration during the burn phase.At the instant of engine burnout,the rocket has risen to 64 m and acquired a velocity of 60 m/s.The rocket continues to rise in unpowered flight,reaches maximum height,and falls back to the ground.The time interval,during which the rocket engine provides upward acceleration,is closest to: