A flow of electricity that constantly reverses direction. In the United States it reverses itself 120 times per second.

All charged objects create an electric field around them. What two factors determine the strength of two electric fields upon the charged objects creating them?

How long have humans been migrating? А 2,000 years about 200,000 years about 60,000 years D 1,000 years

In bacteria, what is contained within the is elements?

Assume that room pressure is 97.3 kPa. Suppose you started with 15 mL of air in the syringe at room pressure. If the air is compressed to 3.0 mL, what will the new pressure be?

You are standing on the sidewalk and see a bus drive by. What would be an ideal frame of reference? A bird flying overhead A jogger running along the sidewalk A car driving alongside the bus A tree across the street

Which safety measures should you follow during a thunderstorm? Check all that apply. (A) Avoid touching anything that conducts electricity. (B) Avoid touching a person who has been struck by lightning. (C) Go outside.

1. An automobile with a mass of 1000 kg accelerates when the traffic light turns green. If the net force on the car is 4000 N, what is the car's acceleration?

Imagine that you replace the block in the video with a happy or sad ball identical to the one used as a pendulum, so that the sad ball strikes a sad ball and the happy ball strikes a happy ball.

Under what conditions will an object experience a gravitational force? Under what conditions will an object experience an electric force? Under what conditions will an object experience a magnetic force?

A basketball player pushes down with a force of 34 N on a basketball that is inflated to a gauge pressure of 9 x 104 Pa. What is the diameter of contact between the ball! and the floor?