When a body moves in circular motion at constant speed the velocity and acceleration point in opposite directions

a. True
b. False
Indicate whether the statement is true or false


False

Physics & Space Science

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Describe the three sources of internal heat of the terrestrial planets.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

Since it was first predicted in the 1970s, scientists have observed the evaporation of about a dozen black holes

Indicate whether the statement is true or false

Physics & Space Science

A 2.4-kg ball falling vertically hits the floor with a speed of 2.5 m/s and rebounds with a speed of 1.5 m/s. What is the magnitude of the impulse exerted on the ball by the floor?

A.

9.6 Ns

B.
2.4 Ns

C.
6.4 Ns

D.
1.6 Ns

E.
1.0 Ns

Physics & Space Science

Atoms of materials that are good conductors of electricity have

A. only electrons, and so these electrons are easily moved. B. mostly protons; thus, the negative charges jump easily from atom to atom. C. outer electrons which are loosely bound and thus easily moved. D. no electrons; thus, any that are given to them are easy to move about.

Physics & Space Science