The disk's average angular speed during those 5 seconds was
(1/2) (100 + 300) rad/s = 200 rad/sec
Spinning for 5 sec at an average angular speed of 200 rad/s, the disk turned
(200 rad/s) x (5 s) = <em>1,000 radians</em>
(That's 500/pi revolutions = roughly 159.2 revolutions.)
Hydroelectric power is generated from moving water is true.
Option A.
<h3><u>Explanation:</u></h3>
Hydroelectric power is the type of renewable source of energy which is obtained from turning a turbine through a running source of water like river or waterfall and producing the electrical energy from it. Running source of water is a must need for a hydroelectric power.
Oil or gasolene is actually petroleum which is mined from under the earth surface which is then burnt to obtain energy. Its used to produce jet fuel, but isn't a renewable source of energy.
Propane is also a byproduct of gasolene which is non renewable source of energy.
Geothermal energy is renewable source of energy, but it doesn't require a solar cell to produce the power.
Can you please help me with my school troubles
Answer:
The Moon does not fall towards Earth right now because Earth rotates itself. The energy from the Earth's own rotation around its axis is gradually tranferred into energy of the Moon's orbital motion. That's why the Earth's rotating speed decreases but the distance to the Moon increases.
Answer:
C
Explanation:
- Let acceleration due to gravity @ massive planet be a = 30 m/s^2
- Let acceleration due to gravity @ earth be g = 30 m/s^2
Solution:
- The average time taken for the ball to cover a distance h from chin to ground with acceleration a on massive planet is:
t = v / a
t = v / 30
- The average time taken for the ball to cover a distance h from chin to ground with acceleration g on earth is:
t = v / g
t = v / 9.81
- Hence, we can see the average time taken by the ball on massive planet is less than that on earth to reach back to its initial position. Hence, option C
