A transformer is to be used to step down voltage from an alternating current source from 220V to 110V. If the primary has 120 turns, then the number of turns in the secondary is.

When you are in the front passenger seat of a car turning to the left, you may find yourself pressed against the right-side door. What concept (s) explain (s) why you press against the door and why the door presses on you? 1.

A ball traveling with an initial momentum of 5.1 kgm/s bounces off a wall and comes back in the opposite direction with a momentum of - 4.3kgm/s. What is the change of momentum of the ball? What impulse is required to produce this change?

What's the relationship between voltage and current

A rock falls 30 m. Its KE before it strikes the ground is 4,392 J. What is the mass of the rock? A. 15 kg B. 146 kg C. 1.5 kg D. 3.0 kg

On the surface of the earth, you are in the process of throwing a ball straight upward. The ball has a mass of 1 kg and at a given instant, the ball and your hand are accelerating upward at 5 m/s2.

Which of the following choices best represents a potential stressor?

How do you distinguish between speed, velocity, and acceleration?

The force of friction on a sliding object is 10n. the applied force needed to maintain a constant velocity is:

What is the best hypothesis to use for this investigation

Quantum physics would most likely be needed to understand the motion of which of the following? A. an atom B. a cell C. a ball D. a galaxy