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A Styrofoam box has a surface area of 0.85 m2 and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 25°C. If it takes 8.3 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam.
W/m · K
welding machine draws a 18A of current at 240V. When it is inadvertently connected to a 120V outlet, the current in it is 10A. Is the machine's resistance ohmic
Two 29.0%u2212cm -focal-length converging lenses are placed 14.0cm apart. An object is placed 39.0cm in front of one lens. Where will the final image formed by the second lens be located
An object is recovered from under the sea. Its weight is measured to be 71.5 lb and its volume 2.5 ft3. What is the object%u2019s weight density
A 57-kg pole vaulter running at 1.1 m/s vaults over the bar. Her speed while she is above the bar is 1.0 m/s. Avoid air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
Suppose a bat uses sound echoes to locate its insect prey, 3.00 m away. What is the percent uncertainty does this cause for the bat in locating the insect
When the switch was first closed to charge the capacitor, what was the effective resistance of the capacitor when it was fully charged
A series RCL circuit contains a 48.0-? resistor, a 2.70-?F capacitor, and a 3.75-mH inductor. When the frequency is 2590 Hz, what is the power factor of the circuit
four charges, given in multiples of 1.00×10-5 C form the corners of a square and four more charges lie at the midpoints of the sides of the square. find the direction of the electric field at the center of the square
A bungee jumper undergoes simple harmonic motion with amplitude 7.9m and frequency 0.110Hz. Determine the bungee jumper's velocity
. Once the crate has started to move, expalin how large must F be in order to keep the crate moving at a constant speed?
You have three resistors with values 3.7?, 2.8?, 5.1?, and a battery of 3.6V. You begin by connecting the three resistors in parallel, What is the magnitude of the current in the 2.8 resistor
A motorcycle is travelling at a constant velocity of 30ms. The motor is in high gear and emits a hum of 700Hz. find the period of the sound waves emitted from the motorcycle
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