A planet has a mass of 5.4x1024kg and its single moon has a mass of 1.05x 1022kg. If the distance between the planet and the moon is 3.2x10km, what is the gravitational pull
of the planet on the moon? (G=6.67x10-11Nx mº/kg)

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)