When you drop a penny off the roof of a building, it takes 10 seconds to reach the ground. How high is the roof?

a kg object and a kg object are separated by m. find the magnitude of the net gravitational force exerted by these objects on a kg object placed midway between them.

Select the correct answer. Based on the law of conservation of energy, which statement is false? O A. Energy is lost when machines don't work right. OB. We can't add more energy to the universe. O c.

As the electric current in a lightbulb is slowly increased the filament glows kore and more brightly. Why does this happen

How many people does it take to pull a wagon?

How is the acceleration of a moving object determined?

5. A B note has a frequency of 493.88 Hz. Calculate its wavelength in meters.

When one of the electrons of a particular atom undergoes a transition to a quantum state of lower energy, it a) collides with another of its electrons b) exchanges quantum states with another of its electrons c) undergoes a transition to a quantum

What's the symbol for an ionized bromine atom?

What is the hottest layer in the Sun's atmosphere?

Which do you need to calculate the speed of a wave? A. distance and frequency B. distance and time C. time and frequency