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A pulley of 5.0cm radius, on a motor, is turning at 30 rev/sand slows down uniformly to 20 rev/s in 2.0s. Calculate
(a) the angular acceleration of the motor,
(b) the number of revolutions itmakes in this time, and
(c) the length of belt it winds in this time.
A beam of sunlight encounters a plate of crown glass at a 52.70° angle of incidence. Find the angle between the violet ray and the red ray in the glass
Sam heaves a shot with weight 16-lb straight upward, giving it a constant upward acceleration from rest of 45.7 m/s^2 for a height 65.0 cm. What is the speed of the shot when he releases it
A mixture of ethyl alcohol (molecular mass = 46.1 u) and water (molecular mass = 18.0 u) contains one mole of molecules. What mass m of water does it contain
An ideal gas has a volume of 0.20 m3, a temperature of 30 oC, and a pressure of 1.0 atm. What is the new pressure
A boy whirls a stone using an r-m long string in a horizontal circle h m above the ground. The string broke, and the stone flies off horizontally and strike the ground x m away.The velocity with which the stone flies off the circle is? The centrip..
a point charge q1 2.40 microc is held stationary at the origin. a second point charge q2 -4.30 microc moves from the
The battery for certain cell phone is rated at 3.70V. According to the manufacturer it can produce 3.15 X 10^4 J of electrical energy, find the average current that this cell phone draws when turned on
An airplane has a speed of 285 km/h relative to the air. There is awind blowing at 95 km/h at 30.0o north of east relativeto Earth. In which direction should the plane head to land at anairport due north of it present location? What is the plane's sp..
Four identical particles, each with mass m = 10-6 kg and charge Q = 10-6 C, are initially at the four corners of a square with side-length a = 0.01 m. what is the final speed of the released particle once it is very far away
A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r, how fast is the roller coaster traveling at the bottom of the dip
An optical disk drive in your computer can spin a disk up to 10,000 rpm (about 1045 rad / s). what is the magnitude of the average angular acceleration of the disk
A proton travels with a speed of 4.90 106 m/s at an angle of 55° with the direction of a magnetic field of magnitude 0.190 T in the positive x-direction. What is the magnitude of the magnetic force on the proton
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