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For the following, suppose a star is at a distance of 20 parsec from Earth. Compute the following (only numbers and units are needed):
1) What is its apparent magnitude m?
2) If the star has the same luminosity as Sun, what is its absolute magnitude M?
3) By how much (what angle) does the apparent direction (relative to the fixed background of faraway stars) to this star change over one year?
4) How far away would a 100 W light bulb have to be to have the same apparent brightness (magnitude) as this star? (Note: L sun = 3.84.1026 W and M sun = +4.74 and m2-m1 = 2.5 lg (F1/F2))
A uniform electric field, E = -50 N/C, fills a region of space. A partcicle with mass, m = 0.025 kg, bearing charge, q = 1mC, Determine where and when the particle crosses the x-axis
A motorist travels for 3.0h at 80.0 km/h and 4.0 h at 60.0km/h. What is her average speed for the trip
The earth orbits the sun once a year (3.16 x 10^7 s) in a nearlycircular orbit of radius 1.50 x 10^11 m. With respect to the sun,determine the magnitude of the earth’s centripetal acceleration.
A tire 2.00 ft in diameter is placed on a balancing machine,where it is spun so that its tread is moving at a constant speed of60.0 mi/h. What is the acceleration of the stone as the tire is being balanced
an adventurous archaeologist crosses between two rock cliffs by slowly going hand-over-hand along a rope stretched
A 50.5 g ice cube, initially at 0°C, is dropped into a Styrofoam cup containing 360 g of water, initially at 19.2°C. What is the final temperature of the water
q1. david is driving a steady 21.0 when he passes tina who is sitting in her car at rest. tina begins to accelerate at
A piano is brought upstairs by two workers. Due to a mistake by one of the workers, the piano rolls down the stairs and finally comes to rest by the outside door.
You are asked to design a cylindrical steel rod 55.0 long, with a circular cross section, What must the rods diameter be
A water droplet of radius 0.015 mm remains hanging stationary in the air. If the electric field of Earth is 100 N/C, how many electrons must the water droplet lack? In which direction the electric field of Earth must be directed for that problem to m..
q1. an airtight box has a removable lid of area 1.00 10-2 m2 and negligible weight. the box is taken up a mountain
An object with mass m1 = 5.90 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley, Find the magnitude of the acceleration of each object
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