What was the Law of Triads? A. Elements were arranged into three rows. B. Elements were arranged in groups of three. C. Elements were arranged into three periods. D. Elements were arranged into three periods and three groups.

A firework is ignited, and explodes with a flash and a loud bang as it is blown apart. The system consists of: the firework, the Earth, and the air. Which choice best describes how energy is transformed in the system?

As a longitudinal wave travels through a medium, it displaces the particles. parallel to the direction which the wave travels. b. along the opposite plane of travel. c. vertically along the direction that the wave travels. d.

The only force acting on a 3.1 kg body as it moves along the positive x axis has an x component fx = - 8x n, where x is in meters. the velocity of the body at x = 2.0 m is 11 m/s. (a) what is the velocity of the body at x = 4.

Which of the following statements about the measurement of electrical quantities is correct? A. Electrical pressure is measured in units called watts. B. Resistance is measured in units called ohms. C. Current is measured in units called volts. D.

Mary is trying to determine the charge of an object in the lab. She observes that it is repelled by a positively charged rod. What can you say about the charge of the object?

Measurements of the earth's magnetic field have been recorded since?

What are some things cyclists do to reduce friction?

A person with his ear to the ground, sees a huge stone strikethe concrete pavement. A moment later two sounds are heard from theimpact: one travels n the air and the other in the concrete, andthey are 2.2 s apart.

An athlete on a sled is moving with a speed of 3.0 m/s across a pond covered with ice. If the total mass of the sled-athlete system is 95.0 kg, what magnitude of the average force is required to bring the sled to rest in 15.0 s

What device is used for side mirrors on automobiles