Glass is mostly made of silica, which is found in sand. if lead is added to silica to make a crystal vase, the lead is known as the

How do nuclear power plnts generate the heat energy to turn water into steam?

A carte with a mass of 155 kg sitting on a flatbed truck which is moving at an acceleration of a = 2.78 m/s2. Suppose that the crate does not slip as the truck undergoes a displacement, whose magnitude is r = 111 m.

When you kick a soccer ball, you apply a force f1 to the ball. what force f2 does the soccer ball exert on your foot? 1. there is no force f2. 2. f1 = f2, acting in the same direction 3. f1 = f2, acting in opposite directions 4. f2 < f1 5. f1 < f2?

One of the four wave interactions is very important to how plants use light to grow. guess which interaction this is

What kind of thermal energy that flows between objects due to a difference in temperature?

A battery applies 45 volts to a circuit, while an ammeter reads 10 ma. later, the ammeter reading drops to 7 ma. assuming the resistance has not changed, the voltage must have

A 150-kg object takes 1.5 minutes to travel a 2,500 - meter straight path. It begins the trip traveling 120 m/s and decelerates to a velocity of 20 m/s. What is the acceleration?

Lava is rock that has undergone a physical change and has liquefied. What is known about this change?

At what temperature did the substance in the test tube into a solid?

What occurs when the velocity of Earth is doubled? a. The orbit of Earth around the Sun becomes smaller b. The orbit of Earth does not change c. The Earth escapes the Sun d. The orbit becomes more elliptical