Bob the American has just driven his car across the Canadian border when he sees a speed limit sign of 85 kilometers/hour. His speedometer only shows his speed in
miles/hour. Convert the kilometers to miles so that Bob doesn't get a speeding ticket.
(Conversions: 1 mile = 5280 ft; 1 foot = 12 in.; 1 inch = 2.54 cm

Contrast the force of gravity between these pairs of objects a 1 kg mass and a 2 kg mass that are 1 m apart and two 2 kg masses that are 1 m apart

Which example has gravitational potential energy? a.a horse slowing down from a run b.an apple about to fall from a tree branch c.a bicycle being pedaled down a horizontal path d.beaker sitting on the floor

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?