What does the variable a meand in physics

Suppose the null hypothesis, H0, is: a weightlifting bar can withstand weights of 800 pounds and less. What is the Type I error in this scenario?

How are sound energy and light energy similar? A. They both need a medium to travel through. B. They both have a wavelength and a frequency. C. They are both kinds of mechanical energy. D. They are both carried from place to place by particles.

Reggie and Charlotte are baking oatmeal cookies. They dip the baked cookies in melted chocolate. The chocolate cools to form a hardened coating. Reggie argues the entire chocolate-covered cookie has undergone a chemical change.

The water in a river flows uniformly at a constant speed of 2.27 m/s between parallel banks 69.3 m apart. You are to deliver a package directly across the river, but you can swim only at 1.58 m/s.

A dancer moves 5 meters toward the left of the stage over the course of 15 seconds. What is her velocity for this time?

The force of attraction between 2 objects is called gravity. Why do you think that an object, like your notebook, pulled towards you? Explain your reasoning. I don't need the answer I just don't understand what this question is asking.

Two planes leave wichita at noon. One planes flies east 30m/h faster than the other plane, flying east at what time will they be 1200 mi apart?

Red, blue, and green are called a __ __ __ __ __ __ __ primary colors because when they are added together, they form all of the colors of the spectrum.

What is it called after data is collected they are often arranged in a what?

If you have a pci express version 2 video card, how many pins will the power connector have if the card requires extra power?