A 1.4 kg water balloon is swung in a vertical circle of radius 0.6m. The balloon rotates at a constant speed in a circle and takes 0.75s to complete one full rotation. a) What is the force of the rope on the water balloon at the top of the swing?

b) What is the force of the rope on the water balloon at the bottom of the swing?

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A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.

What happens when the number of protons in an atom changes