8. A man pulls a sled at a constant velocityr across a horizontal sno'm.r surface. If a force of 30 N is being applied to the sled rope at an angle of 53\" to the ground, what is the force of friction between sled and snow? A] 56M 0} 48M 0} 40N 0} 60M E] 04N 9. A 5.0 kg dog sits on the oor of an elevator that is accelerating downward at 1.20 nifsl. What is the magnitude of the normal force of the elevator oor on the dog? A1342 N a} 45.0 N C} 45.0 N 0} 55.0 N E} :40 N 10. A 4000 kg truck is parked on a 15\" slope. How big is the friction force on the truck? A1133): 104 N a} 1.0 x 10'1 N 0} 3.5 x 10" N 0} 1.5 x 10*1 N E] 2.5 x 10*1 N 11. A 2.0 kg ball is suspended by two light strings as shown in the figure. what is the tensionT in the angled string? 019.5 N a} 15 N C} 20 N 0125 N E130 N 1'2. A string is tied to a door knob 0.?9 m from the hinge as shown in the figure. When the force applied to the sting is 5.0 N. What is the torque on the door? A] 3.3 \"'01 B} 2.2 Ntm 0} 0.40 Nom 0} 0.54 N-m E] 1.1 Ntm