A tired squirrel (1kg mass) does push-ups by applying a force to elevate its chest by 5 cm. Estimate the number of push-ups that a tired squirrel must do in order to do approximately 5J of work.

State the right hand rule of the direction of magnetic field in a conductor carrying current

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?

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m