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A narrow but solid spool of thread has a radius R and mass M. If you pull up on the thread therefore that the center of mass of the spool remains suspended in the air at the same place as it unwinds,
(a) compute what force must you exert on the thread?
(b) Compute how much work has you done by the time the spool turns with an angular velocity ω?
In the process of compressing n moles of an ideal diatomic gas toone-fifth its initial volume, 190 KJ of work is done on the gas. How much work is removed from the gas
A soccer player kicks a rock horizontally off a 34.0-m-high cliff into a pool of water. what was the initial speed given to the rock
A light bulb has a tungsten filament. When the bulb is just turned on and its temperature is 20? C, the current in the bulb is 0.86 A. What is then the temperature of the filament
a wooden box on a wooden table is pulled at constant speed by a 10n force at a 30 degree angle. what is the mass of the
In a typical television or in an older computer picture tube (CRT),the electrons that strike the screen to form an image areaccelerated between two charged plates that have a potentialdifference of 2.5×104 V. The plates are separated by adistance ..
an 830-kg race car can drive around an unbanked turn at a maximum speed of 58 ms without slipping. the turn has a
a force of 8n acts on an object on a frictionless horoizontal surface. the force acts in a vertical plane at an angle
an attacker at the base of a castle wall 3.70 m high throws a rock straight up with a speed 8.30 ms from a height of
a 15.0-m length of wire consists of 9.0m of copper followed by 6.0m of aluminum both of diameter 1.5mm . a voltage
how close can two protons get is one is at rest and the other has a kinetic energy equal to the average energy at t107
A copper rod 20 cm long having a cross-sectional area of 7.0 cm2 is used to connect a boiler maintained at 100 oC to a large block of ice at 0 oC. What is the rate of change in entropy of the boiler
A person with a near-point distance of 32 cm is able to get a usable magnification of 12 with a particular magnifying glass. What is the friend's near-point distance
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