Why isn't solar energy usually the only power source for a region

A cat weighs 8.5 pounds on Earth. how much would this cat weigh on Neptune?

480 vibrations in 4 minutes whAts the period in seconds?

A child sets off the firecracker at a distance of 100 m from the family house. what is the sound intensity β100 at the house?

Three ways to increase the potential difference across a lamp without changing the power supply.

An automobile can be considered to be mounted on four identical springs as far as vertical oscillations are concerned. The springs of a certain car are adjusted so that the oscillations have a frequency of 4.42 Hz.

A pilot flies horizontally at 1300 km/h, at height h! 35 m above initially level ground. However, at time t! 0, the pilot begins to fly over ground sloping upward at angle u! 4.3° (Fig. 2-38).

A helicopter flies 30 km 30 degrees north of east, drops of the supplies to a research team; it then heads 50 degrees north of west traveling 70 km to drop the supplies to a filming crew. What is the resultant displacement of the helicopter?

Plaskett's binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. This statement implies that the masses of the two stars are equal (see figure below).

Is mercury (the planet) rocky or gaseous (meaning relating to or having the characteristics of a gas.)

What does one prolonged blast emitted by boat a using an efficient sound producing device indicate?