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.
Answer:
2.8 N
Explanation:
Fp = 7.7 N
mA = 12.1 kg
mB = 7 kg
Let a be the acceleration and Fc be the contact force between A and B.
By the free body diagram, use Newton's second law
Fp - Fc = mA x a ..... (1)
Fc = mB x a ..... (2)
Adding both the equations
Fp = (mA + mB) x a
7.7 = (12.1 + 7) x a
a = 0.4 m/s^2
Substitute this value in equation (2), we get
Fc = 7 x 0.4 = 2.8 N
Thus, the contact force between the two blocks is 2.8 N.
Explanation:
Answer:

Explanation:
<u>Work and Kinetic Energy
</u>
The work an object does due to its motion is equal to the change of its kinetic energy. Being ko and k1 the initial and final kinetic energy respectively and m the mass of the object, then

Since

We have

The truck has a mass of 60,000 kg and is moving at 27 m/s. The runaway truck ramp must stop the truck, so the final speed is 0. Thus


