Why are frames of reference important for motion

A body is suspended from the ceiling with two wires that make an angle of 40° with the ceiling. The weight of the body is 150N. What is the tension in each wire?

A fulcrum moving a resistance of 200 g has a distance to the fulcrum of 20 cm, the effort mass of 50 g has a distance to the fulcrum of 80 cm. The resistance moves 10 cm, the effort moves 40 cm. Calculate the efficiency of the lever.

A car accelerates uniformly from rest and reaches a speed of 34.3 m/s in 10.4 s. The diameter of a tire is 33.2 cm. Find the number of revolutions the tire makes during this motion, assuming no slipping. Answer in units of rev.

Which is the most accurate description of potassium (K) ? A. It is a metalloid. B. It is dull, brittle, and a poor conductor of electricity. C. It will tend to gain an electron in a chemical reaction. D.

Why can scientists ignore the gravitational force when studying the physics of an atom?

If a resource is nonrenewable, it ___ A) exists in unlimited quantities B) can be replaced within 100,000 years C) exists in limited quantities D) can be replaced within 10 years

About how long would it take a car driving at 17 m/s to travel 100 m?

What do compressions look like in a sound wave?

45 g of vinegar and 60 g of baking soda were used in a chemical reaction. What is the total mass of the products?

The maximum oxygen uptake is known as the