Who invented the electric scoreboard

Why does pumping a soccer ball with an air pump increase the pressure inside the ball? the pump puts more gas particles inside the ball. the pump changes the gas particles into different substances. the pump increases the volume of the ball.

Nitroglycerin flows through a pipe of diameter 3.0 cm at 2.0 m/s. If the diameter narrows to 0.5 cm, what will the velocity be?

Hot coffee in a mug cools over time and the mug warms up. Which describes the energy in this system?

Identifying Correct Formulas Which formulas have been correctly rearranged to solve for radius? Check all that apply.

When attempting to solve a difficult problem, the best scientific approach would be to a. bring together a team of scientists with different backgrounds and perspectives to work together to find a solution to the problem. b.

The coloring of the blue morpho butterfly is protective. As the butterfly flaps its wings, the angle at which light strikes the wings changes. This causes the butterfly's color to change and makes it difficult for a predator to follow.

What lunar phase would be observed from the earth, if the moon were at a 90° angle with the earth and sun?

Unbalanced contact forces between several objects would result in A. one of the objects moving B. all of the objects moving C. at least one of the objects moving and possibly all of them moving D. none of the objects moving

A heat pump absorbs heat from the atmosphere at a rate of 30 kW. If work is being done to run this heat pump at a rate of 7.7 kW, what is the coefficient of performance (COP) of the heat pump? A) 2.9B) 22C) 0.26D) 3.9E) 4.9

How do astronomers think the sun may have begun