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    Energy Needed to Ionize a H-atom

    Homework Statement A H-atom when in its lowest energy state consiste of a proton nucelus of charge +e and an electron of charge -e and mass 9.11e-31. In the Bohr model of the atom, the electron moves around the nucleus in an aprrox. circular orbit of radius .51e-10m. The speed of the...
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    Simple problem not working out correctly and it's driving me insane. Please help.

    Homework Statement A 2.0kg (M) block hangs from the bottom of a 1kg (m), 1m (L) rod. The block and rod form a pendulum that swings on a frictionless pivot at the top end of the rod. A .01kg bullet (m') is fired into the block, where it sticks, causing the pendulum to swing out to a 30 degree...
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    Torque help, please!

    Homework Statement Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.5 diameter and a mass of 250kg. it's max angular velocity is...
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    Effort vs Work

    So, I want to understand the difference between effort and work applied to this situation: A) Lift/push 1kg a distance of one meter, repeat with 2kgs. How much more effort does it take to lift/push 2kgs instead of 1kg? B) Lift/push 1kg a distance of one meter, repeat with a distance of two...