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Q. A teenager pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 20 rpm in 8.0 s. Assume the merry-go-round is a uniform disk of radius 2.5 m and has a mass of 1000 kg, and two children (each with a mass of 20 kg) sit opposite each other on the edge. Calculate the torque required to produce the acceleration, neglecting frictional torque.
What force is required at the edge?
Q. Light is an electromagnetic wave and travels at a speed of 3.00 x 10^8 m/s. The human eye is most sensitive to yellow-green light, which has a wavelength of 5.45 x 10^-7m. How you find out the frequency of this light?
A massless string runs around two massless, frictionless pulleys. An object with mass m = 12.20 kg hangs from one pulley. A force F is exerted on the free end of the string. What is the magnitude of the force F if the object is lifted at the constant..
The coefficient of static friction between the block and table's surface is &mu s = 1/3. The mass of the block that is hanging down is n1 Kg. The tangent of the angle shown in the figure is tan & theta = n2. What is the minimum value of mass, n3 Kg t..
A ladder 6.10 m long leans against the side of a building. If the ladder is inclined at an angle of 76° to the horizontal, what is the horizontal distance from the bottom of ladder to the building.
Compute the force of tension or compression
Find out kinetic energy of the merry-go-round
The bowling ball has a diameter of 20.6 {rm cm}, and the angle the stick makes with the horizontal is 30.0 {rm ^circ}. You may suppose there is no friction between the stick and the bowling ball, though friction with the floor must be taken into acco..
How much current does an immersion heater draw from the car
An oil drop whose mass is determined to be 3.3x10^-15 is held at rest between two large plates separated by 1cm while the potential difference between them is 340 V. How numerous excess electrons does this have here.
An 82 kg lumberjack stands at one end of a 355 kg floating log. Both the log and the lumberjack are at rest initially. If the lumberjack now trots toward the other end of the log with a speed of 2.70 m/s relative to the log, what is the lumberjack's ..
Find the magnitude of total displacement of the object
An object 9 cm tall is placed at the zero mark of a meterstick. A spherical mirror located at some point on the meterstick creates an image of the object that is upright, 4 cm tall, and located at the 49.0 cm mark of the meterstick.
A toy train is pushed forward and released at x_0 = 2m with a speed of 2m/s. It rolls at a steady speed for 2s, and then one wheel begins to stick. The train comes to a stop 6m from the point at which it was released. What is the magnitude of trai..
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