A large crate is pushed to the right along a rough surface by a
320 N applied force. The friction force due to the surface
is 100 N, and the mass of the box is 40 kg. Determine the
net force acting on the crate.
A. 400 N
B. 320 N
C. 100 N
D. 220 N

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

The heliocentric and the geocentric models of the solar system included these central principles

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.