Why is a block of gold is more dense than a block of iron of equal size?

Describe the composition of the nucleus of an atom.

During a race, a runner runs at a speed of 6 m/s. Four seconds later, she is running at a speed of 10 m/s. what is the runners acceleration? show your work.

What is the speed of a wave, if the wavelength is 100 m and the period is 20 s? A.) 2000 m/s B.) 120 m/s C.) 80 m/s D.) 5 m/s If you could include how you solved the problem, that would be amazing!

What is the effect of sunlight on the earth? A. Sunlight warms the earth evenly. B. Sunlight warms the poles more than the equator. C. Sunlight warms the earth unevenly. D. Sunlight warms the poles first and then the equator.

A cd player uses a ___ to convert info to an electrical signal A. Neon light B. Sodium vapor light C. Laser

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