Please help me answer 5-8 its about work and torque in physics

5. A marble is rolling across a surface. The friction acting on the marble surface is 10 Newtons. If the marble has a radius of 0.02 meters, calculate the torque created by the friction. Round your answer to the nearest hundredths place (.01). Do not put units in your answer. 6. You are attempting to open a door. The door requires a torque of 73 Nm to open. If you push a distance of 0.7 meters from the hinges, how hard must you push to make the door open? Round your answer to the nearest tenths place (.1). Do not put units in your answer. 7. You are using a wrench to unscrew a bolt. You apply a force of 30 Newtons to the wrench and create a torque of 12 Newton*meters on the bolt. How far from the bolt must you have applied this force? Round your answer o the nearest hundredths place (.01). Do not put units in your answer. 8. Calculate the magnitude of the net torque acting on the block below if r, = 4.6 meters and r2 = 0.6 meters. 10 N 10 N -.............................."