A grasshopper of mass 0.12 g jumps vertically. It uses its back legs over a time of 0.020s to jump, leaving the ground with a velocity of 3.0 ms.
What is the average power developed by the legs of the grasshopper?
A 9.0 x 10-'W
B
1.8 x 10-2W
с
2.7 x 10-2W
D 37 W

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine