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A heavy flywheel rotating on itscentral axis is slowing down because of friction in its bearings.At the end of the first minute of slowing, its rotational speed is0.70 of its initial rotational speedof 175 rev/min. Assuming a constantrotational acceleration, find its rotational speed at the end ofthe second minute.
A lead bullet (? = 11.3 X 103 kg/m3) is placed in a pool of mercury (? = 13.6 X 103 kg/m3). What fractional part of the volume of the bullet is submerged
A 74 kg man in a 5.0 kg chair tilts back so that all the weight is balanced on two legs of the chair. find the pressure exerted by each leg on the floor
An amusement park roller coaster starts out on a level track 50.0 m long and then goes down a 50.0-meter incline at an angle of 30° to the vertical. It then goes up a 20.0-meter ramp with an incline of 20° to the horizontal.
Find the energy transferred in 1 h by conduction through a concrete wall 2.2 m high, 3.90 m long, and 0.20 m thick if one side of the wall is held at 20°C and the other side is at 5°C
In a Young's experiment using sodium light (λ = 589 nm), the slits are 1.2 µm wide. You notice that fringes 4, 8, etc. are missing. How many fringes appear on the screen
a snowboarder moves along a horizontal ramp before going off of the edge of the ramp. 1.8s after leaving the ramp, find the snowboarders speed at the moment she leaves the ramp
An ideal gas consists of n moles of diatomic molecules that rotate but do not oscillate. What is the change in the mean free path of the molecules
When a 2.50 kg object is hung vertically on a certain light spring described by hooke's law, the spring stretches 2.76 cm. What's the force constant of the spring?
Two small plastic spheres, one charged to 18nC and the other to ? 18nC , are connected by a 30-mm-long insulating rod. What is the maximum possible torque on the dipole
a 100.0 pf air-filled capacitor consists of two circular plates of radius 0.40 mm. how far apart are the
An electron and a positron have masses of 9.11 10-31 kg. They collide and both vanish, with only electromagnetic radiation appearing after the collision. determine the energy of the electromagnetic radiation
a 210 g bucket containing 12.5 kg of water is hanging from a steel guitar string with mass m 8.58 g density p 7750
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