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Problem: A CD-ROM drive in a computer spins the 12-cm-diameter disks at 7600 rpm.
Required:
Question 1: What is the disk's period (in s)?
Question 2: What is the disk's frequency (in rev/s)?
Question 3: What would be the speed of a speck of dust on the outside edge of this disk?
Question 4: What is the acceleration in units of g that this speck of dust experiences?
A 70 kg astronaut floating in space in a 110 kg MMU (manned maneuvering unit) experiences an acceleration of 0.029 m/s2 when he fires one of the MMU's thrusters. What is the thrust of the thruster
a horizontal beam of electrons travels from north to south in a discharge tube where the earth has a downward component
uppose you are driving your car on a business trip and are travelling at 30 m/s. Your boss, who is waiting at your destination, expects the trip.
A 4.55kg block of ice at 0.00oC falls into the ocean and melts. The average temperature of the ocean is 3.55oC, including all the deep water. By how much does the melting of this ice change the entropy of the world? (J/K)
find the phase change undergone by its electric vector
a parallel-plate capacitor is made from two aluminum-foil sheets each 5.7 cm wide and 5.6 m long. between the sheets is
A copper wire with a diameter of 1.3 mm has a uniform electric field of 0.45 V/m imposed along its entire length. The temperature of the wire is 36°C. What is the current density in the wire
A ball of aluminum of radius 1cm is dropped from a height of 2 meters. How long does it take
the pilot of an airplane traveling 170 kmh wants to drop supplies to flood victims isolated on a patch of land 140 m
What must be the potential difference across the plates of the capacitor filled with a dielectric so that it stores the same amount of electrical energy?
Suppose all temperatures to be exact, and neglect important figures for small changes in dimension. An ideal gas in a cylinder is at 5c and 5.0atm. If it is heated so its rms speed increases with 20m/s, what is its new pressure?
The electric potential energy stored in the capacitor of a defibrillator is 58 J, What is the potential difference across the capacitor plates?
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