What is a critical angle

Neglecting the effect of air resistance a stone dropped off a 175-m high building lands on the ground in: A) 3s B) 4s C) 6s D) 18s E) 36s

The asteroid belt is a region between Mars and Jupiter that contains a multitude of large rocks and planetary fragments called asteroids. Most asteroids are about 3 AU from the Sun.

A sample of a radioactive substance is reduced to 1.0 gram after 4 half-lives. Determine the mass of the original sample before it decayed. A 1/16 grams B 16 grams C 8 grams D 1/8 grams

Which element is the most prevalent in the human body? nitrogen hydrogen carbon oxygen

An object that is in free fall seems to be

A plane is sitting on a runway, awaiting takeoff. On an adjacent parallel runway, another plane lands and passes the stationary plane at a speed of 40 m/s. The arriving plane has a length of 40 m.

How much time does it take for a car travelling at 5m/s in 21 metres

Finley is trying to transmit a sound wave that will travel continuously, but he is frustrated by the excess noise. What kind of signal is Finley sending?

The isotope of an atom contains 40 protons and 51 neutrons suddenly has two neutrons added to it. What isotope is created? 1. Antimony-39 2. Zirconium-93 3. Antimony-53 4. Zirconium-53

Choose all that apply. Which are phases of matter? Steam, Plasma, Solid, Liquid, Gas, Water