Light of wavelength 659.1 nm is emitted by a star. The wavelength of this light as measured on Earth is 661.2 nm. How fast is the star moving with respect to Earth? If it is moving away from Earth, enter a negative value and if it is moving toward Earth, enter a positive answer. *need answer in km/s

1. Read and U What information are you given? Mass= m = 0.15 kg Speed of light = c = 300,000,000 m/s = 3 x 108 m/s 2. Plan and Solve What unknown are you trying to calculate? The amount of energy produced = E = ? What formula contains the given quantities and the unknown? E = mc2 Replace each variable with its known variable and known value. E = (0.15 kg)(3.00 x 108 m/s)2 E = 1.35 x 10¹6 kg.m²/s2 = 1.4 x 1016 J 3. Look Back and Check a separate In a nuclear reactor, 1.5 kilograms of plutonium-239 is completely converted to energy. How many joules of energy are produced? nits

How do I solve this equation? M = 54grams g= 980 cm/s^2 m= 9grams v= 571.20 cm/s r= 50 cm I need to find the expected value for average speed (in cm/s) by setting F=Mg and F= mv^2/r equal to each other. Can someone explain the steps to me please?

The distance from earth to the nearest star is about 4 x 1016 meters. How long would it take a radio signal traveling at the speed of light, 3.0 x 108 m/s, to make a one-way trip to this star?