Asphere mass m1  and a block of mass m2  are connected by a light cord that passes over a pulley. the radius of the pulley is r, and the mass of the thin rim is m.. the block slides on a frictionless, horizontal surface.                               derive an expression for the linear acceleration of the two objects

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m. the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

According to the tide table below what time of day will the highest tide occur?

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n