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A 31.0-kg child on a 1.00-m-long swing is released from rest when the ropes of the swing make an angle of 30.0° with the vertical.
(a) Neglecting friction, find the child's speed at the lowest position.Incorrect: Your answer is incorrect.Your response differs from the correct answer by more than 10%. Double check your calculations. m/s(b) If the actual speed of the child at the lowest position is 1.40 m/s, what is the mechanical energy lost due to friction?J
A person driving her car at 48 km/h approaches an intersection just as the traffic light turns yellow. The yellow light lasts only 2.0 s before turning to red, how far will she travel before stopping
A jet engine emits sound uniformly in all directions, radiating an acoustic power of 2.91 × 105 W. calculate the corresponding sound intensity level
A conducting rod is moved in a magnetic field of 0.5T as shown. The bar is 0.4m long and has a velocity of 12 m/s. What is the induced voltage across the bar
You are at a rock concert and find that when you stand 15 m from a speaker, the intensity is so high that it hurts your ears. how far from the speaker should you stand
A small coin, initially at rest, begins falling. If the clock starts when the coin begins to fall, what is the magnitude of the coin\'s displacement
A 41.4-cm diameter disk rotates with a constant angular acceleration of 2.30 rad/s2. Find the angular speed of the wheel
An early model of the hydrogen atom viewed it as an electron orbiting a proton in a circular path with a radius of 5.29×10?11m. What would be the speed of the electron in this model
A gas is taken through the cyclic process described in the figure. (The x axis is marked in increments of 1.5 m3.) Find the net energy transferred to the system by heat during one complete cycle.
assume a charge starts at rest on an equipotential surface, is moved off that surface, and then is eventually returned to the same surface at rest after a round trip. How much work did it take to do this? Explain.
A sport utility vehicle (SUV) and a sports car travel around the same horizontal curve. The SUV has a static stability factor of 0.80 and can negotiate the curve at a most speed of 18 m/s without rolling over.
Imagine that we define the rear end of a train 120 m long to long to define the origin X'=0 in the train frame and we define a certain track signal light to define the origin X=0 in the track frame. Where does this event occur in the train frame
An ice-making machine operates in a Carnot cycle. It takes heat from water at 0.0 oC and rejects heat to a room at 24.0 oC. How much energy must be supplied to the device
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