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A weight W is supported by attaching it to a vertical uniform metal pole by a thin cord passing over a pulley having negligible mass and friction. The cord is attached to the pole 40.0 cm below the top and pulls horizontally on it. The pole is pivoted about a hinge at it base, is 1.75 m tall, and weighs 55.0 N. A thin wire connects the top of the pole to a vertical wall at an angle of 37.0 degrees to the wall. The nail that holds this wire to the wall will pull out if an outward force greater than 22.0N acts on it.
a) What is the greatest weight W that can be supported in this way without pulling out the nail?b) What is the magnitude of the force that the hinge exerts on the pole?
In an amusement park water slide, people slide down an essentially frictionless tube. They drop 2.8 m and exit the slide, moving horizontally, What horizontal distance do they travel from the exit point
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
An object attached to a horizontal spring is oscillating back and forth along a frictionless surface. The maximum speed of the object is 1.75 m/s, and its maximum acceleration is 7.79 m/s2. How much time elapses betwen an instant when the object's sp..
A particular heat engine has a useful power output of 4.40 kW and an efficiency of 30.0%. The engine expels 7200 J of exhaust energy in each cycle , Find the time interval for each cycle
A box of mass 12.0 kg is sitting on the floor of an elevator which is accelerating upwards at 5.1 m/s2. If the coefficient of static friction between the box and the floor if 0.30, what is the minimum horizontal force needed to just start moving the ..
A pulley cable system on a construction site lifts 20,000 N concrete block to a height of 40 m. If this takes 2 minutes what is the power of the pulley cable system
An airplane, capable of flying at a speed of 500 miles/hr in still air (i.e., the airplane can fly with a speed of 500 miles/he relative to the air), How long does it take the plane to fly over the river
Calculate escape velocity for an object started at the surface of the earth, going straight up. Neglect any complications due to the earth turning.
a rocket of rest length 1000 meters moves with respect to us at v 35c. there are two clocks on the ship one in the
A heat pump has a coefficient of performance of 3.70 and operates with a power consumption of 7.15 103 W. How much energy does it extract from the outside air
The classroom temperature is 20 C. The relative humidity is 60%. What is the total humidity (kg of H2O vapor) in the room
A gas increases in pressure from 2.00 atm to 6.00 atm at a constant volume of 1.00 m3, How much work is done in one cycle
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