Adouble pulley with friction is being used to lift a 50kg object at constant velocity. if the force needed is 300n, what is the efficiency and the actual mechanical advantage of the pulley? 0 a. efficiency = 0.6, mechanical advantage-2 o b. efficiency-0.83, mechanical advantage-2 ° c. efficiency = 0.6, mechanical advantage = 1.67 0 d. efficiency = 0.83, mechanical advantage-1.67

The specific heat of silver is 0.057 calories/gram°c. if 10.0 grams of silver were heated and the temperature of the sample changed by 20.0°c, how many calories of heat energy were absorbed by the sample?

Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15

Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.