100.0mL of 4.0°C water is heated until its temp. is 37°C. If the specific heat of water is 4.18J/g°C, calculate the amount of heat energy needed to cause this rise in temperature.

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.

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot