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A 78 g ice cube at -18°C is placed in a lake whose temperature is 12°C. Calculate the change in entropy of the cube-lake system as the ice cube comes to thermal equilibrium with the lake. Th
A 2.88 mol sample of an ideal gas expands reversibly and isothermally at 286 K until its volume is doubled. What is the increase in entropy of the gas?
An 82 ohms resistor has a current of 0.73 A and is connected in series with a 140 ohms resistor. What is the emf of the battery to which the resistors are connected?
A portable CD player operates with a current of 27mA at a potential difference of 4.2 V. What is the power usage of the player?
A current of 0.83 A flows through a copper wire 0.50 mm in diameter when it is connected to a potential difference of 15 V. What is the length of the wire?
What is the minimum number of 70 ohms resistors that must be connected in parallel to produce an equivalent resistance of 12 ohms or less?
A rifle is aimed horizontally at a target 46 away. The bullet hits the target 2.5 below the aim point. (a) What was the bullet's flight time?
An electron in the hydrogen atom is in an excited state given by (n=4, l=3, ml=2, ms=1/2). List the possible final states the system could be in after the emission of photon. Include in the list the
King Arthur's knights use a catapult to launch a rock from their vantage point on top of the castle wall, 15 above the moat. The rock is launched at a speed of 26 and an angle of 32 above the horiz
Calculate the de Broglie wavelength of the electron in the n=1 state of the hydrogen atom.
The allowed energies of a simple atom are 0.0 eV, 5.0 eV and 8.0 eV. An electron traveling at a speed of 1.8×10^6 m/s collisionally excites the atom. What is the minimum speed the electron cou
What is the orbital angular momentum for the lowest electron orbit in the Hydrogen atom?
The electron and proton of a hydrogen atom are separated (on the average) by a distance of approximately 5.3 x 10-11 m. Find the magnitude of the electric force.
You are given a 10-mH inductor and 2 capacitors,of 5.0 and 2.0-MF capacitance. List the resonant frequencies that can be generated by connecting these element in various combinations.
Two small plastic spheres each have a mass of 2.0 g and a charge of -50.0 nC. They are placed 2.0 cm apart. What is the magnitude of the electric force between the spheres?
A particle is moving in a simple harmonic oscillator potential V(x) = (kx^2)/2 x <= 0, but with infinite potential barrier at x = 0 (the paddle ball potential). Calculate the allowed wave functio
Estimate the energy of a proton in the nucleus by finding the first three allowed energies of a proton in a 5.0 fm long box.
You shine red laser light with wavelength 670 nm through two narrow slits where the spacing between the slits is 0.005 mm. You use a screen placed far from the slits to detect the interference patte
Two, 2cm X 2cm plates that form a parallel capacitor are charged to + 0.708 nC. What are the electric field strength inside and the potential difference across the capacitor if the spacing between t
A 1.5 V power supply is connected to a parallel plate capacitor, each plate is 4 cm in diameter and spaced 2 mm apart. How much charge can the capacitor move from one plate to the other?
The electric potential at a point that is halfway between two identical charged particles is 300 V. What is the potential at a point 25% of the way from one particle to the other?
A transformer with a turns ratio (secondary/primary) of 1:14 is used to step down the voltage from a 120-V wall socket to be used in a battery recharging unit. What is the voltage supplied to the re
If your path difference is 1/8 of the wavelength, will this result in constructive or destructive interference? Please show mathematically and explain.
What voltage appears across the primary coil of this transformer if 140V is applied to the secondary coil?
A dinoflagellate takes 5.2 s to travel 0.6 mm. Approximate a dinoflagellate as a sphere of radius 35.0 µm. What is the power output of the flagellate?