3. There is a bell at the top of a tower that is 45 m high. The bell has 450J of energy. The bell has energy. Calculate the mass.

Aplanet of mass m 6.75 x 1024 kg is orbiting in a circular path a star of mass m 2.75 x 1029 kg. the radius of the orbit is r 8.05 x107 km. what is the orbital period (in earth days) of the planet tplanet?

How many molecules are present in 3 mols of silicon dioxide (sio2)?

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?