Speed is a measure of
A.
how long an object can travel with no energy.

B.
the amount of mass per unit volume of a material.

C.
how far an object travels in a certain amount of time.

D.
the length of a moving object and the direction in which the object is moving.

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s. a. determine jay’s mass. b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity