Why is the crust less dense than the core

Which of the following are appropriate acceleration units? km/hr2 m/s/s ft/s miles/hr/min sec/km/m

If a spring constant is 40 N/m and an object hanging from it stretches it 0.50 m, what is the mass of the object?

List the following colors of visible light from lowest energy to highest energy: green, blue, yellow, red, violet.

Which of the following would you expect to have the highest specific heat? SC. A. 1.3.3 A) water B) aluminum C) cooper D) sand

Your boss asks you compare two sound waves and determine which has the higher frequency. Wave A has a period of 4⁄100 second and Wave B has a period of 1⁄7 second. What would you tell your boss? A. Wave B has the higher frequency.

A spring (k = 790 N/m) has a length of 48 cm when zero net force is applied to it. What will its length be when 230 N of force is applied to stretch it? Question 3 options: 3.4 m 0.77 m 3.9 m 0.29 m

Inert gas used to make bright city lights True or False

A boulder on top of a cliff has a potential energy of 12400J. How high above is the boulder?

If the graph represents speed what is measured on the x and y axes

It is difficult to lift a heavy stone than the lighter one on the earth, why?