Which BEST describes the physical properties of the Earth's core?

A) semi-molten

B) water and organic substances

C) a solid lower part and a liquid upper part

D) contains volcanic, sedimentary and granitic rocks

Which waves in the electromagnetic spectrum are considered high energy waves? radio waves and microwaves X-rays and gamma rays sound waves and light waves microwaves and X-rays

Which object has the greatest inertia? * 6-kg bag of feathers 5-kg rock 8-kg bowling ball 7-kg bag of groceries

What is a thermostat?

When photons with a wavelength of 310. nm strike a magnesium plate, the maximum velocity of the ejected electrons is 3.45 105 m/s. calculate the binding energy of electrons to the magnesium surface?

An empty propane tank dropped from a hot air balloon hits the ground with a speed of 143.8 m/s. from what height was the tank released?

Two objects have the same momentum. Do the velocities of these objects necessarily have (a) the same directions and (b) the same magnitudes? Give your reasoning in each case.

If you keep voltage constant and increase resistance resistance, what happens to current?

A scene in a movie has a stuntman falling through a floor onto a bed in the room below. The plan is to have the actor fall on his back, but a researcher has been hired to investigate the safety of this stunt.

During energy transformation, all energy systems: are a. 100 percent efficient b. lose energy c. gain heat energy d. create energy

An apple with a mass of 0.95 kilograms hangs from 3.0 meters above the ground. What is the potential energy of the apple