An electric winch pulls an 875 N crate up a 15° incline at 0.25 m/s. The coefficient of friction between the
crate and incline is 0.45.
a. What power does the winch develop?
b. How much electrical power must be delivered to
the winch if it is 85 percent efficient?
Please someone help...?

Explain why you think this diagram shows what happened to the carbon in the biodome.

Is the portion of the electromagnetic spectrum that has a frequency just above that of visible light.

3. a particle with initial velocity v⃗ 0=(5.85×103m/s)j^ enters a region of uniform electric and magnetic fields. the magnetic field in the region is b⃗ =−(1.35t)k^. you can ignore the weight of the particle. a. calculate the magnitude of the electric field in the region if the particle is to pass through undeflected, for a particle of charge +0.640 nc.