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The hot, glowing surfaces of stars emit energy in the form of electromagnetic radiation. It is a better approximation to suppose that the emissivity equals 1 for these surfaces. Consider a star with a surface temperature of 6060 Kelvin, equal to our sun. If it radiates at a rate of 1.29×1026 Watt, determine what is the radius of the star?
A sailboat is running along a straight course with the wind providing a constant force of 55 lb. The only other force acting on the boat is resistance as the boat moves through the water. The resisting force is numerically equal to five times the boa..
An electric field of 16000 N/C is directed along the positive x-axis. What is the electric force on an electron in this field
On a frictionless track, a 0.55 kg cart is traveling at 0.70 m/sec when it runs into a spring that is anchored to the end of the track. what is the original kinetic energy of the cart as it approached the spring
a 4 microf capacitor is charged by a 200 v supply. it is then disconnected from the supply and is connected to another
hree thin rods are formed into a right triangle. Each of the sides has mass M and length L, and the hypotenuse is of mass 2 M. find the center of mass of the triangle
A coffee cup heater and a lamp are connected in parallel to the same 120-V outlet. Find the resistance of the lamp
A helium-neon laser (?=633 nm) illuminates a diffraction grating. What is the spacing between slits of the grating
q1. a water-skier is moving at a speed of 14.7 ms. while she skis in the same direction as a travelling wave she
Two identical sinusoidal traveling waves are moving in the same direction along a stretched string. The amplitude of the resultant wave is 1.80 times that of the common amplitude of the two combining waves. What is the phase difference between the..
a car travels 20km at 15degrees north of west then turns and goes 30km at 10degrees east of south . find the carss
A source of sound waves of frequency 0.7 kHz is traveling during the air at 0.45times the speed of sound. What is the frequency of the sound received by a stationary observer if the source moves toward her?
The edge of a cube consist of equal resistors of resistance R, that are joined at the orners, let a battery be connected to two opposite corners of a face of cube. what is the efective resistance.
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