A baseball with a mass of 0.15 kg falls towards the surface of the Earth. Just before the apple hits the ground it has a speed of 6.64 m/s. How much Kinetic Energy does the baseball have before it hits the ground?

You carry a 7.0-kg bag of groceries 1.2 m above the ground at constant speed across a 2.7m room. how much work do you do on the bag in the process? (a) 157j (b) 0.00j (c) 185j (d) 82j

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Which notation is used to represent an alpha particle? a. b. c. d.