What is the source of all magnetism?

Gravitational waves

Sound waves

The core of the Earth

Electric current

A horizontal line on a displacement-time graph means the object is

Rainbow cannot be seen at midday even in the rain why?

Where do television waves come from? Where do radio waves come from?

What causes an object to slow down after no longer being pushed

A solid concrete block weighs 140 N and is resting on the ground. Its dimensions are 0.370 m x 0.150 m x 0.0820 m. A number of identical blocks are stacked on top of this one.

They are generally thought to be blank naturally occurring emotions that are present from birth

If an aircraft is loaded 90 pounds over maximum certificated gross weight and fuel (gasoline) is drained to bring the aircraft weight within limits, how much fuel should be drained?

3. Shortwave radio is broadcast between 3.50 and 29.7 MHz, To what range of wavelengths does this correspond? Why do you suppose this part of the spectrum is called shortwave radio?

How does a star's temperature change as the star ages from a main sequence star to a red giant and from a red giant to a white dwarf?

What factors in the atmosphere seem to have the greatest effect in the amount of radiation received from the sun?