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August 29, 2015

Posted by Rebekah on Tuesday, April 16, 2013 at 11:41pm.

1. Which of the following shows the correct sequence of energy transformations when listening to the radio?
electrical; kinetic; sound; kinetic; electrical
electrical; sound; kinetic; sound; electrical
sound; electrical; kinetic; electrical; sound
kinetic; sound; electrical; kinetic; electrical

2. The graph shows the sources of electrical energy in the United States. In 2002, the total amount of electrical energy produced in the United States was 38.2 quads. How much was produced using gas?
• 7TH GRADE SCIENCE?!?! - bobpursley, Tuesday, April 16, 2013 at 11:55pm

None of the answers are correct on the first one.

Radio waves, electrical energy in radio,magnetic energy on speaker drive, kinetic motion on speaker cone, sound energy (which is a kinetic wave), to the ear drum (kinetic ear drum movement), to kinetic wave movement in the ear canal moving small cillia in the inner ear, to electrical impulese in the ear nerves transmitted to the brain.

• 7TH GRADE SCIENCE?!?! - Rebekah, Tuesday, April 16, 2013 at 11:57pm

For the 1st one I got
C. sound electrical kinetic electrical

and for the second

Is that right?

• 7TH GRADE SCIENCE?!?! - bobpursley, Wednesday, April 17, 2013 at 12:03am

I dont have the graph to answer number 2.

On the first, I must not understand the question, because the answers make no sense. See my answer for it.

• 7TH GRADE SCIENCE?!?! - keanu lemon, Tuesday, April 23, 2013 at 5:47pm

5. A and # 4 is 5.3 D

• 7TH GRADE SCIENCE?!?! - kaylee, Thursday, April 25, 2013 at 11:28am

(1 pt) electrical; kinetic; sound; kinetic; electrical

5.3

I promise.

• 7TH GRADE SCIENCE?!?! - Anonymous, Tuesday, April 30, 2013 at 11:34am

The law of conservation of energy states that _____ is never created or destroyed. (1 point)

1 /1 point
2.
Unlike other forms of energy, thermal energy is hard to _____. (1 point)

1 /1 point
3.

A _____ transforms kinetic energy into electrical energy.
(1 point)

Unselected answer (0 pts) power plant
Unselected answer (0 pts) steam line

1 /1 point
4.
The graph shows the sources of electrical energy in the United States. In 2002, the total amount of electrical energy produced in the United States was 38.2 quads. How much was produced using gas?
graph
(1 point)

1 /1 point
5.
Which of the following shows the correct sequence of energy transformations when listening to the radio? (1 point)

Unselected answer (1 pt) electrical; kinetic; sound; kinetic; electrical
Unselected answer (0 pts) electrical; sound; kinetic; sound; electrical
Incorrect Answer (0 pts) sound; electrical; kinetic; electrical; sound
Unselected answer (0 pts) kinetic; sound; electrical; kinetic; electrical

• 7TH GRADE SCIENCE?!?! - Gabby, Saturday, May 11, 2013 at 1:58pm

Anon is right. :D