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physics/astronomy quiz 1

Question # 00601489
Subject: Astronomy
Due on: 10/08/2017
Posted On: 10/09/2017 11:08 PM

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Question 1

If an object's velocity is zero, its position will change.

Question 2

If object's acceleration is zero, its velocity will change.

Question 3

If an asteroid is moving at a constant speed in its orbit, it is not accelerating.

Question 4 

Given the steps that follow below, what is the correct sequence of steps in the scientific method?

Given steps:

I. State a problem,

II. Analyze and interpret data,

III. Develop a hypothesis,

IV. Share the results with other scientists,

V. Design and perform experiment to test the hypothesis.

I - II - III - IV - V

V - II - I - III 

Question 5 

A horizontal force of 100 N is required to push a box across a floor at a constant velocity. The net force acting on the box is ____ N.

200

50

100

0

Question 6 

A rock sitting on the surface of an asteroid is moved some distance above the surface. How is the mass of the rock affected by its change in position?

Increase 

decrease

cannot be determined

no change

Question 7 

If object's net force is zero, its velocity will change.

Question 8 

You drop two rocks. One rock has a mass of 8 kg and the other a mass of 7 kg. The 8 kg rock falls no faster than the 7 kg rock because the _____ .

higher mass rock has a larger acceleration

lower mass rock has a larger acceleration

force of gravity is the same for both

force/mass ratio is the same for both

Question 9 

You drop a bowling ball from the second floor balcony of a building. While the bowling ball falls, its speed _____ .

and acceleration both increase

and acceleration both decrease

increases and its acceleration is constant

decreases and its acceleration increases

Question 10 

Newton's law of gravity is an example of a _____ force law.

linear square

linear

inverse square

direct square

Question 11 

Which of the following the correct way to report 0.00123 in scientific notation?

12.3 x 10^-4

123 x 10^-5

1.23 x 10^-3

0.123 x 10^-2

Question 12 

The acceleration of a train that increases its velocity from 10.0 m/s to 14.0 m/s in 3.30 seconds is _____ m/s^2.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Question 13 

Preparing for a turn, a bus slows down with an acceleration of -2.0 m/s^2. Calculate how much time it takes the bus to slow down from 13.0 m/s to 5.0 m/s.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Question 14 

An 77 kg man starts from rest and after 1.40 seconds is running at a speed of 12.0 m/s. The force needed for this man to get up to this speed in 1.40 seconds is ____ N.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Question 15 

If the engines of a jet produce a force of 150,000 N, the acceleration of a 31,000 kg aircraft during takeoff is ____ m/s^2.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Question 16 

A 37 N horizontal force pushes on a 3.8 kg mass resting on a horizontal surface. The surface exerts a friction force of 21 N against the motion. The acceleration of the 3.8 kg mass is ____ m/s^2.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.


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