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Physics Exam 1 Questions and Answers

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All except one of the following require the application of a net force. Which one is the exception?  :-- Maintaining an object in motion at a constant velocity Suppose a theory is used to make a prediction. A measurement is carried out to test the prediction. The measurement is found to ha...

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  • August 31, 2024
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Physics Exam 1 Questions and Answers
All except one of the following require the application of a net force. Which one is the

exception?


 :-- Maintaining an object in motion at a constant velocity




Suppose a theory is used to make a prediction. A measurement is carried out to test the

prediction. The measurement is found to have a value far larger than the prediction. This means


 :-- the theory might have correct elements but must be modified to account for some

unforeseen influences.




The erroneous idea that an object needs a force on it to keep moving even at constant velocity

was held by


 :-- Aristotle.




An elevator of mass 500 kg is caused to accelerate upward at 4.0 m/s2 by a force in the cable.

What is the force exerted by the cable?


 :-- 6,900 N




A new system of units is invented where the basic unit of length is the "dak." The "dak" is

defined as equal to 6 inches, and there are 2.54 centimeters in an inch. How many "daks" are

there in a centimeter?


 :-- 0.0656




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, 2
Elscores: Aug. 27, 24- 2024/2025

A quantity that is a measure of how the velocity of a body changes with time is


 :-- acceleration.




A man standing on a bridge throws a stone horizontally with a speed of 80 m/s. The stone hits

the water below 7.0 s later. The bridge is


 :-- 240.10000000000002 m high.




Suppose you throw a ball vertically downward with a speed of 50 m/s. Neglecting air friction,

what would be the speed of the ball one second later?


 :-- 60 m/s




Suppose a graph of displacement of a body versus time is constructed. The slope of the graph at

any point may be identified with


 :-- instantaneous velocity




An iron robot falls from rest at a great height. Neglecting air resistance, what is its speed after it

has fallen for 2 seconds?


 :-- 20 m/s.




A student releases a ball from rest on an inclined plane and measures that it travels a distance of

0.3 m in a time of 4.0 s. The acceleration of the ball is




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