Acrate of mass 10.6 kg is pulled up a rough incline with an initial speed of 1.51 m/s. the pulling force is 93.0 n parallel to the incline, which makes an angle of 20.1° with the horizontal. the coefficient of kinetic friction is 0.400, and the crate is pulled 5.08 m.
a) how much work is done by the gravitational force on the crate?
b) determine the increase in internal energy of the crate-incline system due friction.
c) how much work is done by the 93.0 n force on the crate?
d) what is the change in kinetic energy of the crate? e) what is the speed of the crate after being pulled 5.08 m?

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

In an experiment, how can i change human errors? be specific.

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?