how fast is a ball going when it hits the ground after being dropped from a height of 16m the acceleration of gravity is 9.8

When Plutonium-239 undergoes alpha decay, it becomes A) curium-241 + an alpha particle B) uranium-235 + an alpha particle C) neptunium-237 + and alpha particle D) plutonium-237 + and alpha particle

1. which of the following are true. a. theories turn into laws with enough proof. b. A hypothesis can be proven incorrect through experimentation. C. A theory describes a natural phenomenon but offers no explanation for how it occurs. D.

Newton's first law of motion applies to what?

Examples of stored energy

What pressing problem did the invention of the cotton gin solve? A. removing seeds from cotton fiber B. efficiently harvesting raw cotton C. quickly plowing the cotton fields D. irrigating the fields of cotton plants the answer is A.

34. A steam engine operates between 300K and 600K, the maximum possible efficiency of this engine is a. 100% b. 75% c. 50% d. 25%

How many moles of phosphorus trichloride are in 200 grams of the molecule? 62.67 mol 27,466.6 mol 1.46 mol 0.69 mol

A starship passes Earth at 80% of the speed of light and sends a drone ship forward at half the speed of light rela - tive to itself. Show that the drone travels at 93% of the speed of light relative to Earth.

Rubies are used in electronics

Two kids are on a merry-go-round that is turning at a constant rate. ariel is near the outer edge, and bob is closer to the center. ariel has answer (smaller, the same, or greater angular speed?