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Let's say you're playing with/babysitting/watching over a child (6 - 10 years old). The child is inquisitive and asks you various questions. Your task: explain to a child what is a moment of inertia? Note that this is a child who hadn't studied physics and doesn't know things like torque, kinetic energy, integral, etc. So if your explanation will include all these terms, the child won't understand anything! You want to explain this concept without relying on these more advanced ideas, you want to do it by simpler means to get your point across.
A 0.950kg block is attached to a spring with spring constant 16N/m, What is the amplitude of the subsequent oscillations and What is the block's speed at the point where x= 0.20
The world's strongest magnet that can produce a sustained field is a 45-T device at the National High Magnetic Field Laboratory in Florida. What's the corresponding magnetic-energy density
A recording engineer works in a soundproofed room that is38.0 dB quieter than the outside. find what is the intensity outside
A 3.50-kg steel ball strikes a wall with a speed of 13.0 m/s at an angle of ? = 60.0° with the surface. what is the average force exerted by the wall on the ball
a heat engine has an efficiency of 65.0% and receives 150 J of heat per cycle. How much work does it perform in each cycle
The motion of the 3-in.-radius cylinder is controlled by the cord shown. Knowing that end E of the cord has a velocity of 12 in./s and an acceleration of 19.2 in./s^2, both directed upward, determine the acceleration (a) of point A, (b) of point B..
At 28 meter below the surface of the sea (density of 871 kg/m3), where the temperature is 5oC, determine the volume of the bubble before it breaks the surface
An object of mass 250 g is attached to the first object, after which the system oscillates with half the original frequency. What is the mass of the first object
The electric potential energy stored in the capacitor of a defibrillator is 68 J, What is the potential difference across the capacitor plates
A large 3kg object hangs from a rope wound on a 40 kg wheel. The wheel has an actual radius of 0.75m and a radius of gyration of 0.60m. Find the angular acceleration and the distance through which the weight will fall in the first 10s.
A solid disk rotates in the horizontal plane at an angular velocity of 0.042 rad/s with respect to an axis perpendicular to the disk at its center. The moment of inertia of the disk is 0.080 kg·m2.
An elevator at the CN Tower in Toronto, Canada, is able to lift 2000 kg (including the load and the car) to a height of 350 m in 60.0 s. find the minimal power required for the motor of the elevator
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