The nearest star to Earth is Proxima Centauri, 4.2 light-years away. ▾ Part A At what constant velocity must a spacecraft travel from Earth if it is to reach the star in 3.6 years, as measured by travelers on the spacecraft? Express your answer using two significant figures. IVE ΑΣΦ Submit Part B Request Answer → → F How long does the trip take according to Earth observers? Express your answer using two significant figures. IVE ΑΣΦΑ C ? ? years

A spaceship travels at a constant speed from earth to a planet orbiting another star. When the spacecraft arrives, 15 years have elapsed on earth, and 9.1 years have elapsed on board the ship. How far away (in meters) is the planet, according to observers on earth? Number i Earth time CH? 24% 2 Ship time A 215 Spaceship departs earth Units # Earth time 12 FAN 163 Spaceship arrives at distant planet

v2 The formula for length contraction gives the length of an interval on a ruler moving with velocity v relative to an observer as L' = L 1 where L is the length of the same interval on a ruler at rest with respect to the observer. By what fraction is the length of a meter stick reduced if its velocity relative to you is measured to be 67 percent of the speed of light? L- L'

1. Voyager rocket is traveling between Earth and Jupiter (distance  8.013x1010 m). If Voyager probe was thousand times faster and had a speed of v=17x106 m/s=0.057c calculate the Earth-Jupiter distance that instruments aboard measure.  a. What is the time of Voyager's trip measured by instruments onboard? Write your answer in seconds rounded to a whole number (for example 1234 s).   _______________  b. What is the time of the trip measured by NASA on Earth?   2. An asteroid is traveling from asteroid belt to Earth with a speed of 0.6 c. To save the Earth, group of brave men set an explosive device to explode in 138 minutes. When will the group of scientists that monitor asteroid on Earth see the explosion (if everything goes right

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Value: 3 If Superman travels at half the speed of light, 0.5 c, how tall in meters will he be? Report your answer to 2 decimal places. m How much mass in kilograms will he have? Round your answer to the nearest whole number. kg Considering there are 2.205 pounds (lbs.) per kilogram (kg), how lbs Round your answer to the much will he weigh? nearest whole number. HINT: Report your answers withOUT units Question 2 Check Answer

Aliens slowing down to observe Earth often are distracted by lighthouses. As aliens pass Earth in their spaceship they notice a lighthouse completes its circuit once every 7.0 s, however the lighthouse attendant has set the lighthouse to complete its circuit every 5.3 s from his point of view. How fast is the alien spaceship traveling in terms of the speed of light? c

Time left 0:37:58 of on The force of gravitational attraction between two objects with masses m1 and m2, at a distance r apart, is given by Gm, m2 F = 12 of The dimensions of G (the universal constant of gravitation) is O a. M1L2T 3 O b. M1L3T2 O c. M'L3T2 O d. ML3T2

1. A rocket flies toward the earth at c, and the captain shines a laser light beam in the forward direction. Which of the follow- ing statements about the speed of this light are correct? (There may be more than one correct answer.) A. The captain measures speed c for the light. B. An observer on earth measures speed e for the light. C. An observer on earth measures speed c for the light. D. The captain measures speed c for the light.

A speeder tries to explain to the police that the yellow warning lights she was approaching on the side of the road looked green to her because of the Doppler shift. How fast would she have been traveling if yellow light of wavelength 580 nm had been shifted to green with a wavelength of 560 nm? Assume c=3x108 m/s and that light was moving not the car. Write your answer in percents of c rounded to a two decimals for example 1.25