10) On a frozen lake, the ice will break if the pressure on it is greater than 1.0 Pa. Four boys stand on the ice. Which one will fall through? *
A) Weight of boy = 200N, area of his feet = 0.027m^2
B) Weight of boy = 300N, area of his feet = 0.025m^2
C) Weight of boy = 400N, area of his feet = 0.050m^2
D) Weight of boy = 500N, area of his feet = 0.056m^2​

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Drag each tile to the correct box. tiles bra i sequence

The speed of light can be used to measure the