Author Question: Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 s. ... (Read 689 times)

rl

  • Hero Member
  • *****
  • Posts: 579
Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 s. How much power does the elevator use?
 
  A) 20 W
  B) 50 W
  C) 100 W
  D) 1000 W
  E) 20,000 W

Question 2

For light waves, different frequencies mean different
 
  A) colors.
  B) speeds.
  C) brightness.
  D) amplitudes.
  E) None of the above.



aliotak

  • Sr. Member
  • ****
  • Posts: 326
Answer to Question 1

Answer: B

Answer to Question 2

A



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

Did you know?

Chronic necrotizing aspergillosis has a slowly progressive process that, unlike invasive aspergillosis, does not spread to other organ systems or the blood vessels. It most often affects middle-aged and elderly individuals, spreading to surrounding tissue in the lungs. The disease often does not respond to conventionally successful treatments, and requires individualized therapies in order to keep it from becoming life-threatening.

Did you know?

The average adult has about 21 square feet of skin.

Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

For a complete list of videos, visit our video library