An office worker uses an immersion heater to warm 237 g of water in a light, covered, insulated cup from 20°c to 100°c in 6.00 minutes. the heater is a nichrome resistance wire connected to a 120-v power supply. assume that the wire is at 100°c throughout the 6.00-min time interval. (a) calculate the average power required to warm the water to 100°c in 6.00 min. (the specific heat of water is 4186 j/kg · °c.)

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great. d) about 10 times as great.

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.

Part of a control linkage for an airplane consists of a rigid member cb and a flexible cable ab. if a force is applied to the end b of the member and causes it to rotate by θ = 0.5°, determine the normal strain in the cable. originally the cable is unstretched.