Which substance is used to remove rust from metal?

A: lye (NaOH)

B: hydrochloric acid (HCl)

C: ammonia (NH3)

D: sulfuric acid (H2SO4)

A projectile is launched from ground level to the top of a cliff which is 195m away and 155m high. If the projectile lands on top of the cliff 7.6s after it is fired, find the initial velocity of the projectile (mag. and direction).

Assume that a friend hands you a heavy book to hold as he turns the combination lock on his locker. Which of you does more work?

It is easy to jump on a smooth surface than of cemented surface

In an isolated system, Bicycle 1 and Bicycle 2, each with a mass of 10 kg, collide. Bicycle 1 was moving to the right at 5 m/s, while Bicycle 2 was moving to the left at 3 m/s. What is the magnitude of their combined momentum before the crash?

Using Newton's Version of Kepler's Third Law II The Sun orbits the center of the Milky Way Galaxy every 230 million years at a distance of 28,000 light-years. Use these facts to determine the mass of the galaxy.

A ball is thrown horizontally from the top of a tower at the same instant that a stone is dropped vertically. Which object is traveling faster when it hits the level ground below if neither of them experiences any air resistance?

Which type of noise has sound at every frequency within the range of human hearing?

The Morpho rhetenor butterfly is shown above. The name Morpho refers to the butterfly's

What is the voltage in a circuit with a resistance of 12 ohms and a current of 20 amp?

You are about to attack a troll in a role-playing game. You will throw w with the letters A through F. In order to bear you will beat the troll? ning game. You will throw two dice, one numbered one to eight and the other gh F.