Gravitational attraction / field strength increases when closer; A light dependent resistor (LDR) can be used as a sensor to detect light intensity.
When a helicopter engine spins the main rotor, it generates torque (see How a Helicopter Works), an equal and opposite reaction. Torque makes it so that the engine itself wants to spin.
Answer:
Solar Energy. The primary source of energy is the sun.
Wind Energy. Wind power is becoming more and more common.
Geothermal Energy.
Hydrogen Energy
Tidal Energy.
Wave Energy.
Hydroelectric Energy.
Biomass Energy.
Explanation:
Answer:
20.7 billion = 20.7E9 converting to units of 10
20.7E9 km = 20.7E12 m
t = S /v = 20.7E12 m / 3.0E8 m/s = 6.9E4 s = 69000 s
69000 s = 1150 min = 19.2 hrs
