Why does the number of elements vary from period to period

How much heat is needed to raise the temperature of 100 g of water from 25 c to 50 c?

What is an output force? A. the force a simple machine applies to an object B. the applied force on a system C. the net force on a system D. the force a person applies to a simple machine

Analyze how some insects are able to move around on the surface of a lake or pond

An object of mass 0.40 kg, hanging from a spring with a spring constant of 8.0 N/m, is set into an up-and-down simple harmonic motion. What is the magnitude of the acceleration of the object when it is at its maximum displacement of 0.10 m?

List several examples that show how electrical energy and light energy are useful to you

An astronaut weighs 104 newtons on the moon, where the strength of gravity is 1.6 newtons per kilogram. What would she weigh on Mars?

A chemical bond formed when Adams share three pairs of electrons is A. an ionic bond B. a single bond C. a double bond D. a Triple bond

A 1100 kg car rounds a circular turn of radius 24.6 m. Of the road is flat and the coefficient of static friction between the tires and the road is 0.59, how fast can the car go without skidding

What is the momentum of a 15 kg tire rolling down a hill at 3 m/s? 5 kg • m/s 18 kg • m/s 45 kg • m/s 60 kg • m/s

Which of Newton's laws, when combined algebraically with his law of universal gravitation, can be used to calculate Earth's mass? A) first B) second C) third