How many experiments are needed to prove a theory

a heavenly body has a mass and radius half that of the earth. find the weight of a body on its surface if its mass is 100kg.

How long can the body maintain an anaerobic burst of energy

What is loudness? a) the frequency of a sound wave b) the rate at which a wave's energy flows through a given area c) the amplitude of a sound wave d) the physical response to the intensity of sound, modified by physical factors

What is the unit for mass?

A force of 200 N is required to keep an object sliding at a constant speed of 2 m/s across a rough floor. How much power is being expended to maintain this motion?

Is electric charge a property of just electricity or is charge a property of all atoms?

Which of the gases found in the Earth's atmosphere is an important factor for weather conditions? A) oxygen B) hydrogen C) nitrogen D) water vapor

How do repeater stations improve the quality of a broadcast?

What is the total number of atoms in the following formula? CaBr2 04

The Amazon River is in Europe. True or False