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The star Sirius has a surface temperature of 9750 K and aradius 2.4 times larger than the Sun's.
a) What is the ratio of the flux (energy per square meter persecond) emitted from the surface of Sirius to the flux emittedfrom the surface of the Sun?
b) What is the ratio of the luminosity of Sirius to the luminosity of the Sun?
Penny's eraser was accidentally dropped out of the window and falls into the street. The window is 9 m above the road. What is the speed of the eraser when it hits the floor
A hockey puck is hit on a frozen lake and starts moving with a speed of 13.4 m/s. Five seconds later, its speed is 5.40 m/s. What is its average acceleration
Gold, which has a mass of 19.32 g for each cubic centimeter of volume, is the most ductile metal and drawn out into a long fiber. what is the length of the fiber
A projectile (mass = 0.259 kg) is fired at and embeds itself in a target (mass = 1.93 kg). (The target is initially stationary). The target (with the projectile in it) flies off after being struck. What percentage of the projectile's incident kinetic..
A spherical capacitor of inner radius 10 cm stores 10nC of charge when charged with 10V. Find s capacitance, its outer radius and the volume between the two spheres
Assume a small child rolls off a bed that is 0.38m above the floor. If the floor is hardwood, the child's head is brought to rest in approximately 2.2mm. If the floor is carpeted, this stopping distance is increased to about 1.1cm.
Suppose the magnitude of the gravitational force between two spherical objects is 2000 when they are 100 apart. find the magnitude of the gravitational force between the objects
A block with mass m =7.5 kg is hung from a vertical spring. When the mass hangs in equilibrium, the spring stretches x = 0.25 m. what is the magnitude of the net force on the block
Two charges are positioned on the x axis. A charge of +4 ?C is located at x = 5 cm and a charge of +2 ?C is located at x = -5 cm. What is the direction of the electric field at the origin
A current of 0.300 A through your chest can send your heart into fibrillation, ruining the normal rhythm of heart beat and disrupting the flow of blood (and thus oxygen) to your brain. If that current persists for 2.17 min, how many conduction electr..
Two identical pith balls are hung by insulating strings, touching each other, as in the picture below. The mass of each ball is 0.002kg. Determine the charge on each ball
Copper has an electrical resistivity %u03C1 = 1.72 x 10-8 %u2126m. What is the electrical resistance of a copper wire
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