Which of the following values represents an index of refraction of an actual material?

A. 0

B. 1 / 4

C. 5 / 4

D. 1 / 2

Sound waves travel faster through liquids than solids because the particles are more spread out. Answer True False

What is the medium that sound waves travel through when a person speaks? a. Air c. Vocal cords b. Your tongue d. It does not use a medium

An asteroid is speeding directly towards a space ship with a velocity of 255 m/s. If the asteroid is detected 8000 meters from the space ship, how long does the crew have to take evasive action before the asteroid hits the ship? A) about 22.

Use Hooke's Law to determine the work done by the variable force in the spring problem. A force of 250 newtons stretches a spring 30 centimeters. How much work is done in stretching the spring from 30 centimeters to 60 centimeters? N-cm

Which quantity can be calculated using the equation E = mc2? the energy needed to split an atom into separate protons, neutrons, and electrons the energy needed to split the nucleus into separate protons and neutrons the energy needed to remove an

Why am i not floating?

A person holds onto an object for 2 minutes, but doesn't move the object. Is work done on the object?

Warming in front of a fire while camping is an example of? A. Conduction B. Convection C. Radiation

In which medium would light travel the fastest? Question 21 options: a. across a room b. in a swimming pool c. through outer space d. through a railroad track

A 0.60 Kilo gram basketball poses on the rim of a basketball hoop that is 3.0 m high find the potential energy of the ball there (use G=10 N/KG.)