Grade 11Mechanics

The longer the board and the shallower the water, the farther will a surfboard skim across the water. Explain. (See The Surf Skimmer, by R. D. Edge, American Journal of Physics, July 1968, p. 630.)

1 Answer

The shallow water exerts less pressure to the board. Thus, the pressure difference just above the surfboard and below the water us also less. The lift force acting on the board is pressure times the area of the board. A longer board has less cross-sectional area. The effect is that the lift force acting on the board is less. This makes the board to offer less resistance. Therefore, the surfboard skim can move farther across the water.

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The longer the board and the shallower the water, the farther will a surfboard skim across the water. Explain. (See The Surf Skimmer, by R. D. Edge, American Journal of Physics, July 1968, p. 630.)

Radhika Batra

1 Answer

Kevin Nash

O
│
/ |
/ |
/θ |
●----+
r

Find the value of K if work done is zero for the force
F= =2i+5j and displacement
d = si-Kİ (Kis positive

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

11
21
31
41

The longer the board and the shallower the water, the farther will a surfboard skim across the water. Explain. (See The Surf Skimmer, by R. D. Edge, American Journal of Physics, July 1968, p. 630.)

Radhika Batra

1 Answer

Kevin Nash

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