Okay here goes:
6) A 76 kg box slides down a 24 degree ramp with an acceleration of 3.2 m/s^2. Find the coefficent of kinetic friction between the box and the ramp.
7) What acceleration would a 161 kg mass have down this ramp?
8) A box of books weighing 346 N moves with a constant velocity across the floor when it is pushed witha force of 417 N exerted downward at an angle of 31.9 degrees below the horizontal. Find the coefficent of kinetic friction between the box and the floor.
9) A freight train has a mass of 2.3 x 10^7 kg. If the locomotive can exert a constant pull of 7.5 x 10^5 N, how long would it take to increase the speed of the train from rest to 84.9 km/h? (Disregard friction.)
10) A 3.1 kg block is pushed along the ceiling with a constant applied force of 87 N that acts as an angle of 59 degrees with the horizontal. The block accelerates to the right at 6.4 m/s^2. What is the coefficent of kinetic friction between the block and the ceiling?
11) A 4.7 kg bag of groceries is in equilibrium on an incline of 30 degrees. What is the magnitude of the normal force on the bag?
All problems use 9.81 for gravity.
Someone please help me I CANT DO IT AAAHHHH!!!