What is the speed of light in quartz

A sample of dna contains 1000 guanine bases how cytosine bases does it contain

A boat crosses a 200m wide river at 3m/s, north relative to water. The river flows at 1m/s as shown. What is the velocity of the boat as observed by a stationary observer on the river back from the boat departed?

How would you explain a thin layer of ice breaking under your weight

Which of the following provides evidence that geologic activity occurred in the past on Earth's Moon? a) the revolution of the Moon around the Earth b) the axial tilt of the Moon c) the phases of the Moon d) the presence of solidified lava flows on

What is the principal difference between a radio wave and light?

In the heat equation, what does c represent

5. A balloon is ascending at the rate of 4.9m/s. A pocket is dropped from the balloon when situated at a height of 245m. How long does it take the packet to reach the ground? What is its final velocity?

What is the one thing you can do to control the momentum your car carries in a potential crash?

Two charges q1 and q2, that are distance d apart, repel each other with a force of 6.40 N. what would be the force between two charges q1 and = 2q and q2=3q, that are distance d apart?

How fast would a particle be traveling relative to an experimenter in order to have a measured mass that is 20 times its rest mass?