A rugby player is tackled by another player and lands with the combined weight of both players on his knees. If the weight of the first player is 1300N and the tackler is 1100 N, and the player’s knee measures 0.1 m by 0.1 m, then 240,000Nm2 of pressure is exerted on the turf when the player lands on both his knees. Is this a realistic figure for the amount of pressure? Explain your answer.

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity