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Science

Physics

force

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter3: Energy And Conservation Laws

Section: Chapter Questions

Problem 3P: In Section 2.4, we computed the force needed to accelerate a 1,000-kg car from 0 to 27 m/s in 10 s....

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Concept explainers

Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.

Question

A 500-kg car is moving at a velocity of 60 kph. How much force shall be applied
on the brakes in a span of 10 seconds to put it to a full stop?
2. How long shall a force of 4, 500 N shall be applied on the brakes of a 1200-kg
truck moving at a velocity of 80 kph to slow it down to 20 kph?
3. What is the mass of a bus moving at a velocity of 100 kph if it has to fully stop
before an intersection if a 6000-N of force is applied on it in 10 seconds?

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In Section 2.4, we computed the force needed to accelerate a 1,000-kg car from 0 to 27 m/s in 10 s. Compute the force using the alternate form of Newton’s second law. The change in momentum is the car’s momentum when traveling 27 m/s minus its momentum when going 0 m/s.
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