A pulley system is used to lift a 52 kg crate. They system's mass is negligible. What is the force required to lift the crate with constant speed? Note. the system has two pulley's, one attached to the ceiling and the other to the crate. Students are introduced to three of the six simple machines used by many engineers: lever, pulley, and wheel-and-axle. In general, engineers use the lever to magnify the force applied to an object, the pulley to lift heavy loads over a vertical path, and the wheel-and-axle to magnify the torque applied to an object. The mechanical advantage of these machines helps determine their ability to. The man tells him that he sold the bomb to Olson, the arms dealer. A CIA hacker is able to penetrate Olson's computer and link him to Dressler. Racing against time as missile silos are opened and strategic bombers are launched, Ryan gets a policeman to drive him to the Pentagon.
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A Man Is Attempting To Lift A Crate
Here's the problem:
A crate is pulled up using frictionless pulleys in the manner shown in the figure. The angle is 45 degrees. The masses are, for the small pulley, m1=3.5 kg, for the traveling pulley, M2=6.3 kg, and for the crate, MC=37.4 kg. What is the tension with which the operator must pull on the cable (assume the cable is of neglible mass) in order to raise the crate at a constant speed?
Here's the illustration.
A Man Is Attempting To Lift A Crate
Here's the problem:
A crate is pulled up using frictionless pulleys in the manner shown in the figure. The angle is 45 degrees. The masses are, for the small pulley, m1=3.5 kg, for the traveling pulley, M2=6.3 kg, and for the crate, MC=37.4 kg. What is the tension with which the operator must pull on the cable (assume the cable is of neglible mass) in order to raise the crate at a constant speed?
Here's the illustration.
A Man Is Attempting To Lift A Crate Using A Two Part Pulley System
The pulley system in Figure 6-18 is used to lift a crate of mass m = 52 kg. Note that a chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume that the masses of the chains, pulleys, and ropes are negligible.
(a) Determine the force F required to lift the crate with constant speed.
N
(b) Determine the tension in each chain when the crate is being lifted with constant speed.
N (top chain)
N (bottom chain)
The answers in the back of the book are 260 N for part A and 510 N for part b for both chains.
The 510 part is easy. f=ma f=52*9.81 = 510. Each chain should have 510N of tension. No reason to divide it into half the tension for each chain.
But the first part? Where'd they get 260 from? Gravity is pulling down with f=ma or 510N. So if you don't pull the rope with at least 510N, you're not going to lift the box. Shouldn't 260N of force on the rope just put 260N of tension on the chains while not budging the box one bit? 260 is approximately but not exactly half of 510. I don't know if that yields a clue?
Anyone???
