Which of these is NOT a characteristic of mammals? a. hair c. ectotherms b. large brain d. endotherms

A cheerleader lifts his 59.6 kg partner straight up off the ground a distance of 0.749 m before releasing her. The acceleration of gravity is 9.8 m/s 2 . If he does this 30 times, how much work has he done? Answer in units of J.

What gas is the líquid water turning intro?

If the resistance in a circuit connected to a constant current is halved, how is the voltage in the circuit affected? The voltage remains constant. The voltage is doubled. The voltage is reduced by a factor of 4.

Give an example of a contact force and a non-contact force. Explain how they are different.

Electromagnetic waves vary in a. the speed they travel in a vacuum. b. wavelength and frequency. c. the way they reflect. d. the orientation of their electric and magnetic fields.

Why is thermal energy from the Sun transferred to Earth through electromagnetic waves instead of any other type of thermal energy transfer? Electromagnetic waves can carry energy through matter. Electromagnetic waves can travel through empty space.

Why do different elements emit different colors of light

In an experiment, 108 J of work was done on a closed system. During this phase of the experiment, 79 J of heat energy was added to the system. What was the total change in the internal energy of the system?

J. J. Thomsons experiments provided evidence that an atom

How does our sun differ from most other main sequence stars?