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Consider a bright star in our night sky. Assume that its power output is 3.20 1028 W, about 80 times that of the Sun, and that its distance is 21.0 ly.
(a) Find the intensity of the starlight at the Earth.
(b) Find the power of the starlight that the Earth intercepts.
A spherical brass shell has an interior volume of 1.51 x 10-3 m3. Within this interior volume is a solid steel ball that have a volume of 0.53 x 10-3 m3. What is the volume of mercury that spills out of the hole
The three-toed sloth is the slowest moving land mammal. On the ground, the sloth moves at an average speed of 0.035 m/s, how much further would the tortoise have gone relative to the sloth
A rectangular trough, 1.9m long, 0.50m wide, and 0.30m deep, is completely full of water. at what speed does water emerge from the hole
An electric eel develops a 460V potential difference between its head and tail. What is the energy delivered by this pulse
A 40.00-W eletric motor is able to accelerate a 8755 g car from rest to 30.00 mph in 31.10 seconds. Calculate the efficiency of the motor
q1. show a analyse to find the time in years that it would take to travel to relatively nearby barnards star which is
A convex mirror has a focal length of %u221219 cm. Where is the image if the image is upright and one-half the size of the object
One side of the roof of a building slopes up at 37.0°. A roofer kicks a round, flat rock that has been thrown onto the roof by a neighborhood child.
Rank the magnitudes of the forces exerted on the following particles from largest to smallest. In your ranking, display any cases of equality. (Use only ">" or "=" symbols. Do not contain any parentheses around the letters or symbols.)
An ideal refrigerator utilizes a Carnot cycle operating between 0 degrees Celcius and 18 degrees Celcius. How much energy must be supplied to the refrigerator
What minimum constant acceleration does this need if the aircraft is to be airborne after a takeoff run of 250 m.
A horizontal beam of electrons initially moving at 4.0x10^7 m/s is deflected vertically by the vertical electric feild between oppositely charged parallel plates. the magnitude of the field is 2x10^4N/C. What is the verticle deflection d of the el..
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