What happens when a star's core runs out of hydrogen and why does this occur?

A spacecraft built in the shape of a sphere moves past an observer on the Earth with a speed of 0.500c. What shape does the observer measure for the spacecraft as it goes by?

The magnetic field lines of a bar magnet spread out from the

A sprinter leaves the starting blocks with an acceleration of 4.5m/s^2. What is the sprinter's speed 2 s later

What to do if vehicle struck by lightning

One Newton is expressed in?

How long does it take the moon to go from full-moon phase to new-moon phase

What is the rule of calculation of elastic potential energy?

In 1940, the Tacoma Narrows Bridge across the Puget Sound collapsed. The bridge was a suspension bridge. The wind blowing through the narrows matched the natural frequency of the bridge.

What has more momentum: a sports car moving at 100 mph or a train that is not moving?

What is your mass in kilograms?