How do we know the universe is a closed system?

A student is turning the handle of a generator. another student connects a Bulb to the generator. the bulb lights up. The first student continues to turn the handle of the generator at the same speed, but finds it harder to turn.

Which object is largest? star galaxy globular cluster planet?

Describe the energy transformation that occurs in a digital clock.

a 20 kg sig is pulled by a horizontal force such that the single rope holding the sign make an angle of 21 degree with the verticle assuming the sign is motionless find the magnitude of the tension in the ropend the magnitude of the horizontal force?

Lc circuit consists of a 20.0 mh inductor and a 0.400 µf capacitor. if the maximum instantaneous current is 0.500 a, what is the greatest potential difference across the capacitor

In vacuum, red light travels at a greater speed than blue light does. a. true b. false?

When the sun is directly overhead, a hawk dives toward the ground with a constant velocity of 5.35 m/s at 52.0° below the horizontal. Calculate the speed of its shadow on the level ground. M/s?

How do the tension of the cord and the force of gravity affect a pendulum? A. They are the competing forces that act on a pendulum as it swings. B. They are the two factors that affect the period of a pendulum. C.

What is an example of static friction

What is the configuration of NE