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What is the net flow rate of energy (in watts) from the sphere to the vessel? For simplicity, assume the sphere and the vessel are both ideal blackbody radiators, with emissivity e = 1.
Consider a refrigerator that keeps its contents at 9 degrees Fahrenheit when the house temperature is 73 degrees Fahrenheit. What is the maximum theoretical coefficient of performance, CP, for this
Two stars with equal areas and emissivities have surface temperatures of 4,888 K and 5,720 K respectively. What is the ratio of the radiation power of the second star to that of the first star?
A coal-fired electric power plant has an overall efficiency of 33% and an output of 816 megawatts. How many terajoules (trillions of joules) of waste heat does it reject to the environment each day?
A young lady runs for 20 minutes, and gives off 128 kcal of heat by evaporation of water from her skin. How much water has she lost by evaporation (in kg)?
How much force is needed to stretch a spring (k = 1,000 N/m) by 8 cm? A simple pendulum has a period (T). If we double the mass of the pendulum, what is the new period? A simple harmonic oscillator
(a) what is the system's total kinetic energy (i.e. what is the sum of the kinetic energies of both particles)? (b) how fast is the electron moving? (c) how fast is the positron moving?
A 8.2 nC charge is located 1.7 m from a 4.9 nC charge. Find the magnitude of the electrostatic force that one charge exerts on the other. _______N Is the force attractive or repulsive?
A double inclined plane supports two blocks, A and B. A and B both weigh 10lb. If block A is on an incline of 60 degrees and is connected by a rope to block B, which is located on the other incline
Venus and the Sun are separated by a distance of 0.7 AU. Where along the path between these two celestial objects does their opposing gravitational forces cancel out?
A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V Volts. (C is the capacitance and U is the stored energy.
If a dielectric material with kappa = 3.60 is inserted so that it fills the volume between the plates (with the capacitor still connected to the battery), how much additional charge will flow from t
The surface charge density on an infinite charged plane is - 1.50*10^-6 Cm^2.A proton is shot straight away from the plane at 2.50 *10^6 m/s. How far does the proton travel before reaching its turni
Two circular disks spaced 0.50 mm apart form a parallel-plate capacitor. Transferring 1.60 *10^9 electrons from one disk to the other causes the electric field strength to be 3.10*10^5 N/C . What ar
If the center of mass of this system moves to the right with a speed 4/5 v0, what is the mass of the cart on the right?
If F = 29 N, the angle is 63.5 degrees, M = 2.6 kg, the coefficient of kinetic friction is 0.25, and the vertical contact surfaces between the two blocks are frictionless, what is the magnitude of t
An infinitely long line of charge has a linear charge density of 4.50×10-12. A proton is at distance 15.5 from the line and is moving directly toward the line with speed 1500 . How close does
A 75 g Frisbee is thrown from a point 0.9 m above the ground with a speed of 12 m/s. When it has reached a height of 1.9 m, its speed is 10.1 m/s. What was the reduction in Emec of the Frisbee-Earth
A 11.5 nC charge is at x = 0 cm and a -1.0 nC charge is at 6 cm. At what point or points on the x-axis is the electric potential zero? Express your answer using two significant figures. If there is
What is the minimum angular velocity w_min needed to keep the person from slipping downward? The acceleration due to gravity is 9.8 m/s^2, the coefficient of static friction between the person and t
Assuming no transfer of heat to or from the surroundings, what is the final mass (in grams) of the ice (if any) that remains in the system?
Name and describe two electrical applications where: (a) Joule heating is desirable, (b) Joule heating is undesirable.
A men holding a 10-kg block by a cord designed to withstand a tension of 150 N steps into an elevator. When the elevartor starts up, the cord breaks. What was the minimum acceleration (in m/s2) of t
A diffraction grating has 4588 lines/cm. Light that contains all wavelengths between 431 and 646 nm shines on the grating. Calculate the width of the dark area between the first and second order spe
A 20-kg mass slides along the top of the 100-kg mass and has an acceleration of 4 m/s2.(It thus slide back relative to the 100-kg mass). What is the frictional force in newtons exerted by the 100-kg