A ball is thrown upward with a speed of 30 mps as it leaves the hand (a) How long will it rise? (b) How high will it rise?

When a volleyball coach releases a volleyball from a height of 2 m above the gym floor, it falls to the floor and bounces back to two-thirds the same height. When it is in contact with the floor, the lower side of the ball is temporarily flattened. Suppose the maximum depth of the dent is 1 cm. (Assume the positive direction is upward.)1. Determine the acceleration of the ball (in m/s2) while it is in contact with the floor and compressing. (Indicate the direction with the sign of your answer.) 2. Determine the velocity of the ball (in m/s) as it leaves the floor on the rebound. (Indicate the direction with the sign of your answer.) 3. What If? If instead of dropping the ball, the coach throws it down (from some unknown height) with such a speed that it bounces back up to a height three times its original height, determine the new acceleration of the ball (in m/s2) while in contact with the floor and expanding. (Indicate the direction with the sign of your answer.)

2.24 A block 0.1 m square, with 5 kg mass, slides down a smooth incline, 30° below the horizontal, on a film of SAE 30 oil at 20°C that is 0.20 mm thick. If the block is released from rest at t = 0, determine its initial acceleration. Derive an expression for the speed of the block as a function of time. Plot the curve for V(t). Find the speed after o.1 s. If we want the mass to instead reach a speed of 0.3 m/s at this time, find the viscosity u of the oil we would have to use.

In 1589, the Italian scientist Galileo Galilei is said to have dropped two spheres of different masses from the Leaning Tower of Pisa to demonstrate that their time of descent was independent of their mass. His experiment is faulty because he neglected: (i) The body force due to gravity. The surface force due to pressure. The surface force due to friction. (ii) (iii) (A) (B) (C) (D) (i) and (ii) (i) and (iii) (ii) and (iii) All of the above

360 N marine in basic training climbs a 15 m vertical rope at uniform speed in 8 minutes. His output power

6.2 In class we noted that the potential energy of a spring is given by Vsp (2) and k the spring constant. Now consider an object of mass m (not attached to the spring) that drops from rest, from a height z; > z0; onto the spring (which is initially in equilibrium at its rest length). Both the gravitational force and the spring force now contribute to the potential energy, initial final k(z – zo)²/2, where zo is the spring's equilibrium point E Zo Z=0 Vgrav Vgrav + Vsp if z z0 V (2) = (1) (a) Sketch (by hand, but carefully) a potential energy diagram for V(2) as a function of height z. (b) Include (and mark) the object's initial energy in the sketch of part (a), then include a horizontal line for the object's conserved total energy E. Also mark the turning point zf for z < zO. (c) Calculate the turning point position zf where the object momentarily comes to rest." (d) Your graph of part (a) should have an equilibrium point. Mark this equilibrium point in your graph, then calculate its…

I need the answer quickly