The speed of a motorcycle at a particular moment is it's average speed or is instantaneous speed?

When the velocity of an object is doubled, by what factor is its momentum changed? By what factor is its kinetic energy changed?

Magnetic fields are caused by? A. stationary charges B. copper wire C. only protons D. moving charges

How is that schrodinger's model of atom different than the model that bohr made of an atom?

Match the definition: 1. full moon a visible half-circle 2. first-quarter moon darkest phase of the moon 3. 13 degrees when the the Earth is between the sun and the moon 4.

A system has 410 J of potential energy and 80 J of kinetic energy. Then 90 J of the potential energy is converted into kinetic energy. How much work was done on the system?

If you do 1000j of work on a system and remove 500j of heat from it, what is the change in its internal energy

Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 4.5 m long, its mass is 0.42 kg, and the force exerted on it by the children is 71 N.

An object will only change its motion if a force is directly applied to it. is this a true statement?

Janice has just measured the density of an object. Which value is possible? (Density: D = )

Based on how the book describes a heat pump in sec 16.3 how does a heat pump prove law of conservation of energy