When two or more materials combine chemically they form a

a mass of 0.400 is raised by a vertical distance of 0.450m in the earths growth gravitational field. what is the change in its gravitatioanal potential energy? show your work

A boy on a skateboard moving at a speed of 3 m/s drops a rock from a height of 1.2 m. A girl sitting still on top of a slide will see the rock

How do insulators prevent heat loss?

Why wouldn't a person weigh as much on the moon as on Earth? A. The moon makes a person weightless. B. The moon has less mass than the earth. C. The earth supports a person's weight. D. There is no atmosphere on the moon.

How does crushing a cube of solute increase the rate of dissolving? A) By increasing the amount of solvent. B) By decreasing the amount of solvent. C) By increasing the surface area of the solute.

Heat that is transferred by the movement of currents within a fluid is called?

5. What is the percent composition of sulfur in H2SO4? A. 32.7% B. 65.2% C. 98.1% D. 2.1%

A 0.8kg object accelerate at a rate of4 m/s2. What is the net force acting on a object

Which of the following is the best definition of an isotope? A. elements of the same kind with different numbers of neutrons B. elements of the same kind that have lost electrons C. elements of the same kind that have different electrical charges

Two cars approach each other; both cars are moving westward, one at 85 km/h, the other at 54 km/h. what is the magnitude of the velocity of the first car relative to (in the frame of reference of) the second car? answer in units of km/h.