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A solar cell generates a potential difference of 0.400 V when a 150.0 ? resistor is connected across it and a potential difference of 1.208 V when a 650.0 ? resistor is substituted.What is the internal resistance of the cell in Ohms?
What is the emf of the cell?
The area of the cell is 39.0 cm2 and the rate per unit area at which it receives light energy is 32.0 mW/ cm2. What is the efficiency of the cell for converting light energy to thermal energy in the 650.0 ? external resistor?
A particle's trajectory is described by x=(12t3?2t2)m and y =(12t2?2t)m, What is the particle's direction of motion, measured as an angle from the x-axis, at t=5.0s
What would be the equilibrium temperature when a 271 g block of copper at 280°C is placed in a 169 g aluminum calorimeter cup containing 817 g of water at 11.5°C.
A damped mass-spring system oscillates at 265 -Hz. The time constant of the system is 2.0 s. At t = 0, the amplitude of oscillation is 6.1 cm and the energy of the oscillating system is then 61.00 J.
A uniform rod of mass 3.05×10^-2?2kg and length 0.370m rotates in a horizontal plane about a fixed axis through its center, compute the angular speed of the rod after the rings leave it
The resistance of a conductor is 19.2 ohms at 1.50 degress C and 25.0 ohms 91.0 degress C. What is the temperature coefficient of the resistance
A 423 Hz sound wave travels through a substance. What is the speed of sound in the substance
A train is travelling up a 3.2 degree incline at a speed of 3.55 m/s as the last car breaks free and begins to coast. How long does it take for the last car to come to rest.
A beam of light is incident on a glass plate ( = 1.62) in air and the reflected ray is completely polarized. What is the angle of refraction for the beam
Charge is distributed with constant volume density D throughout the rectangular box with length a, width b and height c.
A power supply maintains a potential difference of 86.1 V across a 1070-? resistor. What is the current in the resistor
Light with a photon energy of 4.5 eV impinges on the surface of a material with work function 0.4 eV to eject electrons
If 20 grams of hot water at 80°C is poured into a cavity in a very large block of ice at 0°C, what will be the final temperature of the water in the cavity? How much ice should melt in order to cool the hot water down to this temerature.
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