Josh has a toy car of mass 3 kg tied to a string of length 2 m. he ties the string to a pole and has the toy car drive in a circle around the pole at a speed of 3 m/s.

a. what is the centripetal acceleration of the car?

b. if the tension in the string exceeds 50 n, the string will break. how fast can he make the car go without breaking the string?

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.

Atoms in a molecule are bonded together by sharing gaining or losing_