The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III

?

The object’s acceleration is zero only in region II.



a.

True



b.

False


b

Physics & Space Science

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Particles (mass of each = 0.20 kg) are placed at the 40-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the initial angular acceleration of the body?

a. 12 rad/s2 b. 5.9 rad/s2 c. 8.4 rad/s2 d. 5.4 rad/s2 e. 17 rad/s2

Physics & Space Science

Length Contraction: A spaceship with a constant velocity of 0.800c relative to Earth travels to the star that is 4.30 light-years from Earth. What distance does the space ship travel as measured by a passenger on the ship?

A. 2.58 light-years B. 3.52 light-years C. 4.12 light-years D. 4.30 light-years

Physics & Space Science

A marble moving 1.48 m/s rolls off the top edge of a 125-cm high table in a room where there is no appreciable air resistance and the acceleration due to gravity is 9.80 m/s2

(a) How far from the base of the table will it strike the floor? (b) How long will it be in the air?

Physics & Space Science

An unfilled electron state in the valence band is called

A) a hole. B) a positron. C) an empty electron. D) a conduction electron. E) an empty positron.

Physics & Space Science