Which statement is NOT true?

Light travels with or without a medium

Light travels faster than sound

Sound must have a medium to travel through

Both light and sound must have a medium to travel through

An object has a forward force of 100N and a reverse force of 25N. What is the resultant force?

In chemistry class, you are given 3 liquids: Liquid A, Liquid B, and Liquid C. They are each in their own beaker. One of these liquids is water which has a denisty of 1.0 g/mL. You also have an ice cube with a density of 0.

A 1-kg ball is thrown at 10 m/s straight upward. neglecting air resistance, the net force that acts on the ball when it is half way to the top of its path is about

Why is charge usually transferred by electrons rather than by protons?

A vehicle has an initial velocity of 30 meters per second. 30 seconds later it is travelling at a velocity of 60 meters per second. What is the acceleration of the veichel

Which of the following statements is true? A. Both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction. B. Nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not. C.

A star may form a black hole once it cannot?

Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip. Which best describes Kai's roundtrip?

The engine that powers a crane burns fuel at a temperature of 1500 oC. It is cooled by air at a temperature of 20 oC. The crane is used to lift a 1000 kg steel girder 30 m into the air.

The portion of a light ray that falls on a surface is a/an