Answer:
14.9 m /s
Explanation:
n = n° x v /[ v -v (s) ]
n is apparent frequency , n° is source frequency,v is speed of sound and v(s)
speed of source.
2300 = 2200 x 343 / [343 -v(s)]
v (s ) = 14.9 m /s.
So, the power that used by the washing machine is <u>400 Watt</u>.
<h3>Introduction</h3>
Hi ! Here, I will help you to calculate the power generated. <u>Power is work done per unit time</u>. If a person or machine can do a <u>large amount of work in the shortest possible time, it will produce or require a large amount of power</u>. The relationship between power, work, and time is expressed in the equation:
With the following condition :
- P = power that produce or require (Watt)
- W = work that had done (J)
- t = interval of the time (s)
<h3>Problem Solving</h3>
We know that :
- W = work that had done = 7,200 J
- t = interval of the time = 3 minutes = 3 × 60 = 180 s
What was asked :
- P = power that used = ... Watt
Step by step :
<h3>Conclusion :</h3>
So, the power that used by the washing machine is 400 Watt.
Answer:
Newton realized that the reason the planets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pulls on the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.
Explanation:
Kinetic energy:
1) A car traveling down the road has less kinetic energy than a semi-truck and traveling at the same speed because the car's mass is much less than the truck's.
2) A river flowing at a certain speed possesses kinetic energy because the water has a certain mass and it also has velocity.
3) An insect flying has a small amount of kinetic energy because its mass and velocity are relatively small.
Potential Energy:
1) The food we eat has chemical potential energy because as our body digests it, it provides us with energy for basic metabolism.
2) A stretched spring in a pinball machine has elastic potential energy and can move the steel ball when released.
3) When a crane swings a wrecking ball up to a certain height, it gains more potential energy and has the ability to crash through buildings.
