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The radius of a park merry-go-round is 1.7 m. To start it rotating, you wrap a ropearound it and pull with a force of 260 N for 17 s. During this time, the merry-go-round makesone complete rotation.
(a) Find the angular acceleration of the merry-go-round(rad/s^2).
(b) What is the magnitude of the torque exerted by the rope onthe merry-go-round? (N*m)
(c) What is the moment of inertia of the merry-go-round?(kg*m^2)
a 2m long uniform bar that weighs 10n is used to hold a 3n sign. a cable is attached to one end of the bar and the
Two Styrofoam balls with the same mass m = 9.5 10-8 kg and the same positive charge Q are suspended from the same point by insulating threads of length L = 0.98 m (the figure below). The separation of the balls is d = 0.026 m. What is the charge Q?
A physics lecture room has a volume of 254 m3. For a gas pressure of 1.00 atm and a temperature of 27.0 oC, use the ideal gas law to estimate the number of air molecules in the room
Cosmic microwave background radiation fills all space with anaverage energy density of 4 X 10^-14 J/m^3. What is the minimum distance from a 10-{\rm kW} radio transmitteremitting uniformly in all directions at which you would find thisrms value of th..
Consider a systen of N non-interacting particles for which the energy of each particle can assume two and only two distinct values: 0 and E (E>0). Find the entropy of the system
On an essentially frictionless, horizontal ice rink, a skater moving at 4.1 m/s encounters a rough patch that reduces her speed by 49% due to a friction force that is 26% of her weight. find the length of this rough patch
You are pushing a 142 kg wooden crate in a straight line a distance of 5.1 m across a wooden floor. The crate is speeding up at 0.30 m/s^2. What is the work done by friction on the crate
state how much energy is transferred in each of the following casesa. 2 grams of steam at 100 degrees celsius condenses
Each is afraid that one vine will break; as a result they grab each other and hang on. They swing upward together, reaching a point where the vines make an angle of 22.1° with the vertical. Find the value of the ratio m/M.
three identical isolated capacitors each with capacitance c are connected in parallel with a 11.7 v potential
At the end of a race a runner decelerates from a velocity of 10.00 m/s at a rate of 0.400 m/s2. What is her final velocity
A wheel initially rotating at an angular speed of 2.4 rad/s turns through 30 revolutions during the time, How long did the acceleration last
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