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A Cepheid variable has been found to have a period of 22 days, from this its luminosity is determined to be 2.8 x 1029 W (720 solar luminosities). The apparent magnitude of the Cepheid is 3.7 while that of the Sun is -26.74. Use this information to calculate the distance to the Cepheid.
A helicopter is rising at 4.60 m/s when a bag of its cargo is dropped. The bag falls for 2.50 s. (suppose that the positive direction is upward.)
Standing on the surface of a small spherical moon whose radius is 6.85·104 m, What maximum height above the surface of the moon will the rock reach
An airplane has a mass of 28,000 kg and takes off under the influence of a constant net force of 44,000 N
It position is xo>0 and i give it a kick so that it moves back towards the origin and executed simple harmonic motion with amplitude 2xo. Find out its position as a fuction of time in the forum of x(t)=acos(wt-&)
A lens system consists of two lenses 48.5 cm apart. The first lens is convex (converging) and has a focal length of 25.22 cm. What is the focal length of the second lens
A heat engine operates between a high-temperature reservoir at 610K and a low-temperature reservoir at 320K. What is the net change in entropy as a result of this cycle?
An ideal gas in a container is at a temperature of 92.2°C. What is the average translational kinetic energy of a gas molecule
What is the capacitance after the separation becomes 2d.
What happens to support force on the workmens feet
Suppose two identical spheres are insulated: sphere A carries +3.54Q and sphere B carries -20.2Q, What is the charge on sphere A now
A 23 kg body is moving in the direction of the positive x axis with a speed of 292 m/s when, owing to an internal explosion, it breaks into three pieces.
As observed from Earth, rocket Alpha moves with speed 0.814c and rocket Bravo travels with a speed of 0.638c. What is the speed of rocket Alpha
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