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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))
An object carries a charge of -6.6 µC, while another carries a charge of -2.0 µC. How many electrons must be transferred from the first to the second object
A 0.800 m long solenoid is formed by wrapping 740 turns of wire around a hollow cylinder with a radius of 0.160 m. calculate the energy stored in the field
A parallel-plate vacuum capacitor, with its plates separated by a distance of x1 has an amount of energy equal to U stored in it. The separation is then decreased to X2
A certain solid-propellant model rocket engine releases a total of 6000 J of energy as it burns. what fraction of the chemical energy released by the engine
given the indices of refraction and of material 1 and material 2 respectively rank these scenarios on the basis of the
In exercising, a weight lifter loses 0.123 kg of water through evaporation, find the change in the internal energy of the weight lifter
A jet flying at 136 m/s banks to make a horizontal circular turn. Calculate the magnitude of the necessary lifting force
to get off a frozen frictionless lake a 71.0 kg person takes off a 0.170 kg shoe and throws it horizontally directly
a 69 kg short track ice skater is racing at a speed of 11 m/s when he falls down and slides across the ice into a padded wall that brings him to rest. how much work is done by the all while stopping the ice skater
A 1.10 liter flask contains a certain quantity of ideal gas at 320 K. Then an equal number of molecules of the same gas is added to the flask, after which the absolute pressure is 1.35 times its original value. Define is the final temperature?
A diving bell with interior air pressure equal to atmospheric pressure is submerged in Lake Michigan. At what depth is the diving bell
Can someone help me solve problem 181, chapter 12 from Engineering Mechanics statics and dynamics, 13th edition. The question is, simply, r = 4sin(2theta), theta = (3t^(3/2))rad. Determine the velocity and acceleration when theta = 60 degrees.
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