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1. A star's temperature is 5647 K. According to the Stefan-Boltzmann law, how much energy is radiated into space per second by each square meter of the star's surface?
2. If the star's radius is 642,000 km, what is the total power output of the star?
A 5 turn loop of wire with a radius of 4cm moves toward a 0.15T magnetic field in a 3 second time interval. What is the average emf induced in the loop? If the loop has a resistance of 5 ohm, what current is generated?
The current density in a 3 μm thick × 75μm wide gold long film is 750,000 A/m2. The current flows along the length of the film. Estimate what is the current in the gold film
An object 0.600 cm tall is placed 17.0 cm to the left of the vertex of a concave spherical mirror having a radius of curvature of 24.0 cm. determine the height of the image and describe the image. upright/virtual / real/ inverted/ enlarged/ behind th..
Two blocks are connected by a light but sturdy string wrapped around a mass-less pulley. What is the magnitude N of the normal force on the block of mass m
A current of 5 A flows to the right along the x-axis through an infinitely long wire. A loop of wire with radius 25 cm is centered along the y-axis at y=1 meter. Draw the final arrangement of wires
A boy kicks a football with an initial velocity of 28.0 m/s at an angle of 30.00 above the horizontal. What is the highest elevation reached by the football
A certain string just breaks when it is under 400N of tension. At approximately what speed will the string break
point charges q1 q2 and q3 are fixed at the vertices of an equilateral triangle whose sides are 2.40 m long. find the
the electric field in an electromagnetic wave is given by the following using the standard units e20cos107x-wt where x
question during the spin cycle of your clothes washer the tub rotates at a steady angular velocity of 34.7 rads. find
A man lifts a 13 kg crate directly upwards from the floor to a shelf (6 m high) at constant speed*. What is the work done by gravity on the crate
Suppose that while moving into an apartment you move a refridgerator into place by sliding it across the floor. What is the least force you could exert on the fridge to move it
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