Why a control is needed in a valid experiment

What is the speed of a 1.0 * 103-kilogram car that has a momentum of 2.0 * 104 kilogram∙meters per second east?

To test your FHE brother's claims about his car, you accept his offer of a ride about campus. Not wanting to exceed the speed limit, he claims he can only give a taste of the accelerating ability of his car and not the full proof.

Which is NOT true about a protostar? a. It is usually much larger than it will be as a star. b. It glows due to the heat of the gases in its core. c. It may become a brown dwarf. d. It generates pressure by fusing hydrogen.

Describe at least one technological application of radioactive decay that can benefit human health. answer - Radioisotopes are used in medicine as tracers to detect and diagnose medical problems.

Suppose you have two magnets. Magnet A doesn't have its poles labeled, but Magnet B does have a clearly labeled north and south pole. If these two are brought into contact with one another, which of the following could you expect? A.

A stone is thrown vertically upward with a speed of 12m/s from the edge of a cliff 70 m high (a) How much later it reaches the bottom of the cliff? (b) What is its speed just before hitting? And (c) what total distance did it travel? (Ans: 5.

After completing a career search, Patrick has decided that he wants to be a paralegal. Which two skills or abilities are important for him to have in order to excel in this career?

The highest peak in the vicinity (<100 kilometers) of Mt. Kilimanjaro is located to the: a. north. b. west c. east. d. south. e. northeast

Which of the following lists contains only examples of renewable sources of energy? A. wind, tidal, geothermal, and hydroelectric B. coal, solar, wind, and biomass C. fossil fuels and nuclear energy D. hydroelectric, petroleum, solar, and wind

The part of a longitudinal wave that is least dense is called a (n) rarefaction refraction contraction compression