A 40-kilogram crate is at rest on a level surface. If the coefficient of static friction between the crate and the surface is 0.69, what horizontal force is required to get the crate moving?

Which of the following should maintain the appropriate temperature and humidity levels and provide closed-loop recirculating: a. Air-conditioning, b. Positive pressurization c. Ventilation

A neutral atom has the same number of electrons as it does neutrons. O A. True O B. False

In the sky, you see a red star and a blue star. Which one is hotter? A. The red star B. They are probably the same temperature C. The blue star D. The answer will depend on how far away the stars are

A ball rolls off of a table (take v0 as 0m/s) that is 1.25m tall. How long does it take for the ball to hit the floor?

An engine with an electronic fuel injection system has high fuel pressure at idle. This could be caused by a: A. low manifold vacuum B. leaking fuel pump check valve C. plugged fuel injection valve D. high manifold vacuum

Which of the following is ignored when determining the relative mass of atoms? protons nucleus electrons. neutrons

Gamma radiation can be significantly reduced by ... A sheet of paper Air A 3 mm thickness of aluminium Several cm of lead

Why is it possible to remove a paper without moving the object on it. (apply newton's law)

If you had a trapped gas and continued to cool it until the lowest possible temperature is reached the temperature is called

Which layer of the atmosphere has the air we breathe?