PHYSICS HIGH SCHOOL

Which is 20 miles per hour north an example of?A.acceleration
B.Direction
C.Speed
D.Velocity

Answers

Answer 1
Answer: D. Velocity because it describes a speed and direction
Answer 2
Answer: D. Velocity
This is because velocity is the speed of something in a specific way. 

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How do wind turbines pollute their environment?

Answers

Although the wind turbines do not pollute the environment directly, it is still able to pollute the environment indirectly. The maintenance, construction, and the assembly of the wind turbines would make use of equipment or machines that would emit some harmful substances. For example, the delivery of the materials, the turbine parts, and the other equipment would entail a lot of back and forth trips. The deliverer, from his vehicle, would sometimes emit smoke or gas from his vehicle that is dangerous to health. 
Wind turbines in fact to pollute the environment. They pollute the environment because when they are being built or manufactured, pollution is produced. Wind power does produce pollution. It also takes up space in land. In farms they take up a lot of space so then we cannot grow crops and animals cannot live there. One turbine can give electricity to about 400 homes. Imagine how many you will need to power a whole country! The turbines are also very loud. It can damage peoples ears when they are near one.

Question on attachment

Answers

The idea that Jacob uses photocells for all the energy need in the park is a good idea. In this way, he is saving so much electricity because photocells are renewable source of energy. The energy can be used for a lifetime, however, its main disadvantage is that no electricity will be produced if sunlight is not present.

While skiing, Ellen encounters a ledge that sends her flying horizontally at a rate of 12 m/s. How far away will she land if the ledge is 7 meters high? ...?

Answers

In this problem, we must first calculate that Ellen will be on air. Using the equation of a free-falling body,

y = -g/2*t^2 + y0

When she hits the ground, y = 0. With y0 = 7 and g = 9.80,
0 = -4.90*t^2 + 7
t = 1.20 s

Thus, her horizontal displacement is then
x = vt
x = (12)(1.20)
x = 14.3 m

An automatic response to a stimulus is called a reflex.

Answers

If you are asking if it is true or false, the correct answer is true. Reflex is an automatic response to a stimulus. Reflex is a stimulus that will allow an individual to respond to an event in which an organism will need to do in order for survival.

When an automotive battery is fully charged, the sulfuric acid and water mixture will have a specific gravity of abouta. 1.0.
b. 0.15.
c. 2.5.
d. 1.3.

Answers


When an automotive battery is fully charged, the mixture of water
and sulfuric acid in it has a specific gravity of about  1.3 .

Answer:1.3

Explanation:

Took the test on Penn foster

Measuring the amount of deuterium in the universe allows us to set a limit on _________.

Answers

Answer:

the density of ordinary (baryonic) matter in the universe

Explanation:

 Deuterium detection is of interest because the amount of it may be related to the amount of dark matter in the universe, but precise measurements have been difficult to obtain. Due to the way in which deuterium was created in the Big Bang, an exact measurement of the amount of deuterium would allow scientists to set limits on the models of the great explosion.

Also, an exact measure of deuterium would be an indicator of the cosmic density of barions (ordinary matter), and that density of barions would indicate whether ordinary matter is dark and is found in regions such as black holes, gas clouds or brown dwarfs, or it is bright and can be found in the stars. This information will help scientists who try to understand the very beginning of our universe.
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