Into how many main groups are fish divided?

a. one

b. two

c. three

d. four

An apple falls straight down from a tree. While the apple is falling: Group of answer choices the gravitational force does positive work on the apple, and the gravitational potential energy increases.

When determining the net force given a force of 12 N and a force of 7 N, what would these forces be called?

Which law of thermodynamics would be violated if heat were to spontaneously flow between two objects of equal temperature?

A 1200-kg car, initially moving at 20 m/s, comes to a stop at a red light over a time of 3 s from the moment the driver hit the brakes.

For projectile motion on level ground assuming negligible air resistance (the initial angle being neither 0o nor 90o) : Can the speed ever be the same as the initial speed at a time other than at t = 0? a. No b.

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?

The hinge at A and cable BDC support beam ABC. Cable BDC passes over the pulley D that is pinned to the ceiling. (Assume that the + x-axis is to the right and the + y-axis is up along the page.

The "zone of avoidance" a) Accounts for the absence of any planet between the orbits of Mars and Jupiter Prevents collisions between planets in the Solar System.

Electric current is ...