Find the mass m of the counterweight needed to balance a truck with mass M = 1 580 kg truck on an incline of θ = 45°. Assume both pulleys are frictionless and massless.

Idon’t quite understand this problem

Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly

What efficiency of a car's engine when heat input is 200,000 joules and waste heat is 150,000 joules? a. 75% b. 35% c. 25% d. 85%