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Older freezers developed a coating of ice inside that had to be melted periodically; an electric heater could speed this defrosting process. Suppose you're melting ice from your freezer using a heating wire that carries a current of 3.0A when connected to 120 V.
part A - What is the resistance of the wire?
part B - How long will it take the heater to melt 810g of accumulated ice at -10 %u2218C? Assume that all of the heat goes into warming and melting the ice, and that the melt water runs out and doesn't warm further.
What is the flux of Zn moving down the rod? Write down all your assumptions (hint: you will need to look up the density of copper. You do not need to account for the variation in density with alloy composition). Clarify what the boundary conditions w..
If, in actuality, a 750 kg car with an initial speed of 96.0 km/h is observed to coast up a hill to a height of 17.0 m above its starting point, how much thermal energy was generated by friction
Water drives a waterwheel (or turbine) of radius R = 3.0 m as shown in the figure. The water enters at a speed v1 = 6.5m/s, What is the torque the water applies to the waterwheel
on turning a corner ,a motorist rushing at 44m/s find a child on road 100m away. he applies the brakes so as to stop the motorcar within 1m of child. calculate the time required to stop.
An airtight container having a lid with negligible mass and an area of 101 cm2 is partially evacuated. what is the air pressure in the container before it is opened
Find the acceleration of an elerton in this field. What is its speed after 50ms.
A man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless, frictionless pulley and back down to the man's hand. The combined mass of the man and chair is 86 kg. With what force magnitude should the man pull on ..
A simple pendulum is made of a small blob of mass m = 9.500 kg attached to the end of an inextensible wire. find the magnitude of the tension in the wire
A balloon with a radius of 14.00cm and an electric charge of 3.75 × 10-9 C is brought within the electric field of the larger balloon so their centres are 40cm apart. Establish the magnitude of the electric force exerted by this electric field on ..
In 1986 a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 160 km long, What is the mass of this iceberg, given that the density of ice is 917 kg/m3
Weak background noises from a room set up the fundamental standing wave in a cardboard tube length of 67.0 cm with two open ends. what fundamental frequency do you hear from the tube
What is the magnitude of the current in the wire as a function of time?
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