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A 50.0 g silver spoon at 20.0 oC is placed in a cup of coffee at 90.0 oC. The spoon heats while the coffee cools. The final temperature of the spoon and the coffee is 89.2 oC. The coffee cools while the spoon heats. Assuming the specific heat of coffee to be the same as the specific heat of water (4.19 J/g.oC) and knowing the specific heat of silver to be 0.235 J/g.oC, what is the mass of the coffee?
A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 53.0-gram mass is attached at the 27.0-cm mark, What is the mass of the meter stick
A thin double convex glass lens with an index of 1.56 while surrounded by air has a 10 cm focal length. what is the focal length of the lens in water
The total current delivered to a number of devices connected in parallel is the sum of the individual currents in each device. Obtain the total current delivered by the source
Johnie wants to go sailing, but their is no wind. Johnie mounts an Industrial Fan on his sail boat with a 40 N force. What is the speed of the boat
A typical adult ear has a surface area of 1.49 × 10-3 m2. The sound intensity during a normal conversation is about 2.11 × 10-6 W/m2 at the listener's ear. How much power is intercepted by the ear
a uniformly charged conducting sphere of 1.22 m radius has asurface charge density of 8.13 X 10^-6 C/m^2. Calculate the electric field at the surface of the sphere
The hole on a level, elevated golf green is a horizontal distance of 125 m from the tee and at an elevation of released 10.4 m above the tee, What was the initial speed of the ball
An electron is moving at a speed of 8.0 103 m/s in a circular path of radius of 2.0 cm inside a solenoid. Find the strength of the magnetic field inside the solenoid
a narrow slit is illuminated with light of wavelength 590 nm. a diffraction pattern is produced on a screen positioned
You and your friend throw balloons filled withwater from the roof of a several story apartmenthouse. You simply drop a balloon fromrest. A second balloon is thrown downwardby your friend 3.7 s later with an initial speedof 72.52 m/s. They hit the gro..
Consider a horizontal square plate capacitor of area 1*1m2, capacitance in vacuum 4 μF, which contains a dielectric material by dielectric constant K=3. The dielectric slides frictionless and is attached via a mass less string and a mass less pulley ..
A current I flows down a wire of radius a. If it is uniformly distributed over the surface, what is the surface current density K
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