A meterstick moving at 0.912c relative to the Earth's surface approaches an observer at rest with respect to the Earth's surface. What is the meterstick's length as measured by the observer?

Astronomers discover an exoplanet (a planet of a star other than the sun) that has an orbital period of 3.87 earth years in its circular orbit around its sun, which is a star with a measured mass of 3.59 x 1030 kg. find the radius of the exoplanet's orbit.

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost