A light bulb has a resistance of 144 Ω and is designed for use with a 120 V power supply. What is the power output of the light bulb? If the bulb is accidentally connected to a 240 V power supply, what would be the power output of the light bulb? Why might this be dangerous? What resistance would be needed in a light bulb that works on 240 V so that it would have the same brightness as the original light bulb?

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

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.

The starship enterprise is caught in a time warp and spock is forced to use the primitive techniques of the 20th century to determine the specific heat capacity of an unknown mineral. the 125-g sample was heated to 96.3°c and placed into a calorimeter containing 85.9 g of water at 20.0°c. the heat capacity of the calorimeter was 14.2 j/k. the final temperature in the calorimeter was 24.5°c. what is the specific heat capacity (in j/g°c) of the mineral? enter to 4 decimal places.