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Two wires with the same length but different cross sectional area. Which wire has a larger electric resistance?
Catching a wave, a 77-kg surfer starts with a speed of 1.1m/s , drops through a height of 1.60m , and ends with a speed of 8.4m/s. How much non conservative work was done on the surfer
If I put 40g of ice at 0°C into a perfectly insulated cup containing 250g of coffee at 90°C, what will the final temperature be when the system comes into thermal equilibrium? Suppose that the specific heat of coffee is the same as that of water.
a light ray traveling in a slab of crown glass surrounded by air. the ray is incident on the right surface at an angle
The current in a solenoid with 21 turns per centimeter is 0.45A, Find the magnitude of the net magnetic field a radial distance of 0.70 cm from the straight wire.
A sledge loaded with bricks has a total mass of 17.1 kg and is pulled at constant speed by a rope inclined at 19.9° above the horizontal. how much work is the roping doing on the sledge
A spinning wheel on a fireworks display is initially rotating in a counterclockwise direction. The wheel has an angular acceleration of -3.20 rad/s2. Find what time is required for the change in the angular velocity to occur
Calculate the focal length required of glasses to be worn, A pair of eyeglasses are designed to allow a person with a near-point distance of 2.52 m to read a road sign at a distance of 25.2 m.
A uniform magnetic field (0.20 T) is directed 35 degrees above the horizontal, penetrating a horizontal circular coil (radius 6.0 cm)
An 9 kilogram package in a mail-sorting room slides 2.50 meter down a chute that is inclined at 54.4 degree below the horizontal. Determine the work done on the package by gravity
A rainbow viewed from an airplane may form a complete circle. Where will the shadow of the airplane appear? Explain
A battery with a 12-V EMF has a terminal voltage of 11.4 V when it delivers 20A to the starter of a car. How much energy is dissipated per unit time by internal resistor
A cylinder contains 2.15 mol of helium gas at 22.5°C. Assume that the helium behaves like an ideal gas. Find the total internal energy of the system
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