john is trying to measure the pressure acting on a square platform. He has placed a mass of 20 kg on the disk and he measures the length of one side of the square as 15 cm. What is the pressure john should measure?

You exert 375 J to move a 45-kg object 5 m. How much force is required?

A mechanical wave generally does NOT A. move through a medium. B. move the medium from one place to another. C. move through solids. D. disturb the medium.

Why do you want the water to drip off the metal before it is placed in the calorimeter? (A) The mass and the initial temperature of the calorimeter water will be incorrect and affect the calculation of the specific heat capacity of the metal.

What color will a star be with a surface temperature of 5000-6000 K? A. blue B. red C. yellow D. white

A boy jogs 250 meters in 110s what is the average speed

It is epistemically possible that a completed physics might include which of the following propositions? O Souls and other spiritual substances exist O God created the universe O Matter is unreal O All of the above

The weight of an object varies inversely with the second power of the distance from the center of Earth. The radius of Earth is approximately 4000 miles.

The chemical reaction of oxygen with other substances is called A. erosion. B. oxidation. C. exfoliation. D. acidification.

Find the net charge of a system consisting of 6.16*106 electrons and 7.68*106 protons. Express your answer using three significant figures. Qnet = 2.43*10-13 C

A motorist is driving at 20m/s when she sees that a traffic light 200m ahead has just turned red. She knows that this light stays red for 15s, and she wants to reach the light just as it turns green again. It takes her 1.