Why athelets pushes the earth backwards with his feets and hands just before the race starts

Ionizing a ground state hydrogen atom requires 2.179 * 10-18 J of energy. What wavelength of light is required to ionize hydrogen and in what region of the electromagnetic spectrum is it?

A car is traveling 20 kilometers an hour, then changes direction at a fork in the road. The action that the car takes changes its Group of answer choices velocity, but not its speed speed, but not its acceleration. speed, but not its velocity.

To accelerate an object what has to increase the mass the weight the force

The environmental and economic benefits of hydroelectricity, giving examples from the case studies and

a group of elements that stretch bend and conduct heat and electricity

If a pressure gauge measure an increase in 3*10^ (5) Pa on an area of 0.7 m^2, calculate the increase in the force applied to the area?

Which of the following is an example of potential rather than kinetic energy? a. water rushing over Niagara Falls b. a molecule of glucose c. a crawling beetle foraging for food d. light flashes emitted by a firefly

If a force of 15 newtons [N] is applied to a surface and the pressure is measured as 4,000 pascals [Pa], what is the area of the surface in units of square milimeters [mm2 ]?

An engineer has the task of producing an aluminum alloy with a density of 3.0 grams per cubic centimeter. She comes up with the perfect alloy and saves a sample of it. Which mass and volume measurements correspond to this sample? 7 g and 2.

What must be your car's average speed in order to travel 235km in 3.25 hours?