Which type of rock is created when lava cools and hardens?

a. metamorphic

b. igneous

c. cement

d. sedimentary

What are the 4 phases of change

The energy of a photon that has a wavelength of 12.3 nm is

A 60 kg skateboarder rider has a momentum of 580 kg-m/s in a direction 42° south of west. What is his velocity in the westward direction? A. 5.8 m/s west B. 6.5 m/s west C. 7.2 m/s west D. 9.7 m/s west

17. As the mass of an object increases, the force needed to accelerate the object a. stays the same b. decreases c. stops d. increases

Best summarizes the law of conservation of energy?

In later years, motors improved and could be run directly from a 60 Hz power supply. As a result, 25 Hz power systems shrank and disappeared.

Acceleration increases over time once a force is applied to the object. Given a force of 10.0 Newtons, which mass will have the greatest acceleration?

The transfer of energy between two objects by electromagnetic waves is called

What is the unit of k (spring constant) in SI system?

The teacher prepares 2.50 liters (L) of a salt solution for a class experiment. How many quarts (qt) are in 2.50 L? (1 quart = 0.943 liters)