A 5.0-kg box slides on the surface on a ramp that rises at 37 ...

[nenivikky]

A 5.0-kg box slides on the surface on a ramp that rises at 37 above the horizontal. The coefficient of kinetic friction between the box and the surface of the ramp is 0.60.
 
  What are the magnitude and direction of the acceleration of the box if it is sliding (a) up the ramp, (b) down the ramp?

Question 2

At 10 cents per kilowatt-hour, how much does it cost to run a 100 watt lightbulb for 200 hours every month?
 
  A) 20 cents per month
  B) 20 per month
  C) 2 per month
  D) impossible to determine because we don't know the voltage
  E) impossible to determine because we don't know the power

[bubulittle310@msn.cn]

Answer to Question 1

(a) 11 m/s2 down the ramp (b) 1.2 m/s2 down the ramp

Answer to Question 2

C

[nenivikky]

Gracias!

[tanna.moeller]

Excellent