6. If a lever has an effort arm of 80 cm and a resistance arm of 20 cm, how much force is need to lift a mass of 100 kg ? of 150 kg ?

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.