Answer:
Explanation:
Let us calculate the average velocity .
Average velocity = total distance / total time
Time taken to drive first 15 mi
= 15 / 60 = .25 h
Time taken to drive next 15 mi
= 15 / 30 = .5 h
Total time = .25 + .5 = .75 h
Total distance = 30 mi
average speed = 30 / .75
= 40 mi / h
So average speed is 40 mph which is less than given velocity of 45 mph .
Hence if she travels at 45 mph , she will take less time .
Answer:
Explanation:
Acceleration of gravity on the surface of
Neptune is given
g' = G M/R^2,
where M is the planet's mass.
M g' will be the apparent weight registed at the poles.
G is the universal constant of gravity
The "apparent weight" at the equator will be
reduced from M g' by the centripetal force M
R w^2, where w is the rotational angular
velocity in radians/s), which you can deduce
from the 16 hour length of a day.
Answer:
Explanation:
Wind is caused by the uneven heating of the atmosphere by the sun, variations in the earth's surface, and rotation of the earth. ... Wind turbines convert the energy in wind to electricity by rotating propeller-like blades around a rotor. The rotor turns the drive shaft, which turns an electric generator
Applied Force, Gravity Force, Normal Force, Friction Force, Air Resistance Force, Tension Force, Spring Force. I know this is more than four but I hope this helps :)
<span>The energy source used to produce most of the electrical energy in the United States is Fossil fuels. Fossil fuels are generated over a long period of time by decomposition of dead flora and Fauna. Fossil fuels consists of three things- Coal, Petroleum and Natural Gas. Natural gas approx contributes 34%, Coal approx contributes 30% and Petroleum approx contributes 1% of total energy produced in US.</span>
