The earth exerts a gravitational force of F(r)=2.99×1016r2 (in Newtons) on an object with a mass of 75 kg, where r is the distance (in meters) from the center of the earth. Find the rate of change of force with respect to distance at the surface of the earth, assuming the radius of the earth is 6.77×106 m.

1.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the mass defect of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev 2.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the binding energy of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev 3.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the binding energy per nucleon of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev

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

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?