When two or more simple machines work together, they are called a(n)
a. compound machine
c. screw
b. effort machine
d. simple machine

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.

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?