how much force does the motor of an elevator need to exert to hold a 1000 kg elevator still if the counterweight weighs 7000 newtons?

It is well known that a potato bakes faster if a large nail is stuck through it. Why? Does an aluminum nail work better than a steel one? Why or why not? (Note: Don't try this in a microwave oven!

Does sunlight really take 8 minutes to reach your eyes?

What is the longest wavelength in the molecule's absorption spectrum?

What is the resistance of a 4.4-m length of copper wire 1.5 mm in diameter? The resistivity of copper is 1.68*10-8Ω⋅m.

If a windbreak can reduce the speed of wind for distances up to 30 times the height of the trees, how far would these trees reduce the wind speed? 47 m 51 m 470 m 510 m

What is s the best description of the constructive interference of light? A. two waves have the same direction of displacement. B. two waves have displacement in opposite directions. C. a longitudinal wave meets a transverse light wave D.

1875 kg car is traveling at 22 m/s. It's momentum is?

Hot air balloon rises because a) molecules become lighter when heated b) molecules move faster and farther apart when heated c) molecules are less attracted by gravity when heated d) molecules become charged and repel each other when heated

If the diameter of the space station is 730 m, how many revolutions per minute are needed for the "artificial gravity" acceleration to be 9.80m/s2?

A person who has dissociative identity disorder: O A. cannot remember who he or she is. O B. has panic attacks when confronted. C. has two or more distinct personalities OD hears voices