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The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 4.0 rev/s in 13.0 s. At this point, the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub slows to rest in 9.0 s. Through how many revolutions does the tub turn during this 22-s interval? Assume constant angular acceleration while it is starting and stopping.
______rev?
A rotating wheel requires 6.00 s to rotate 30.0 revolutions. Its angular velocity at the end of the 6.00-s interval is 96.0 rad/s. What is the constant angular acceleration (in rad/s) of the wheel?
_________rad/s2
A diving board of length 3{rm m} is supported at a point 1 {rm m} from the end, and a diver weighing 550 {rm N} stands at the free end. The diving board is of uniform cross section and weighs 295 {rm N}. Find out the magnitude of the force at the ..
A thin film of oil (n = 1.10) is located on smooth, wet pavement. When viewed from a direction perpendicular to the pavement, What is the minimum thickness of the oil film?
Find the minimum volume of concrete (y = 23.6 kN/m3) needed to keep the gate (1 m wide) in a closed position; l = 2 m. Note the hinge at the bottom of the gate. Explain briefly.
A ballplayer standing at homeplate hits a baseball that is caught by another player at the same height above the ground from which it was hit. The ball is hit with an initial velocity of 21 m/s at an angle of 54° above horizontal.
The rotor of a toy gyroscope consists of an annular cylinder attached to cylindrical shafts by spokes. The rotor is spun by pulling on a string wrapped around shaft.
A string 1.50 m long will break if the tension in it exceeds 2X10^2N. How fast (in m/s) can a rock of mass 1.50 kg be whirled in a circular horizontal path if the string is not to break? Assume the rock moves on a smooth horizontal surface (No fri..
A 250g steel ball and a 500g steel ball each hang from 3.0-m-long strings. At rest, the balls hang side by side, barely touching. To What angle does each ball rebound
A 4.9 kg particle and a 2.7 kg particle have a gravitational attraction with a magnitude of 2.6 ? 10-12 N. What is the gravitational potential energy of the two-particle system
A track athlete running at fast pace had an instantaneous resultant force of 2800 N acting through the heel during heel strike, what were the horizontal and vertical forces acting on the heel
Small spheres of diameter 1.03 mm fall through 20°C water with a terminal speed of 1.00 cm/s. Calculate the density of the spheres
If the hypotenuse of a right triangle is 6.00cm long, and the opposite is 4.00. What is the angle facing the opposite
A hand-driven tire pump has a 2.50 cm diameter piston and a maximum stroke of 34.0 cm. What average force do you exert on the piston, neglecting friction and gravity
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