Constants A certain star is 9.50 light-years away. Part A How long would it take a spacecraft traveling 0.930c to reach that star from Earth, as measured by observers on Earth? ? years Submit Request Answer Part B How long would it take a spacecraft traveling 0.930c to reach that star from Earth, as measured by observers on the spacecraft? ? years Submit Request Answer

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* Sophie and Frieda are twins. They plan a trip to planet X which is 54 light years from Earth. They both leave Earth on their 30th birthday, but on different spacecraft. Sophie takes a spacecraft that travels at .99c, and Frieda takes a spacecraft that travels at .95c. As soon as Frieda arrives she is met at the terminal by Sophie (who was waiting there for her since she had arrived!). What are each of their biological ages (to the nearest 0.1 year) at this meeting? Earth and planet X are in the same (stationary) frame of reference here. A light year is 9.47x1015 m (but using meters will be awkward here)

9. An astronomer on earth observes two spacecraft moving away from each other along an axis that passes through the earth. The astronomer measures the speed of each spacecraft to be 0.875c relative to the earth. At what speed are the spacecrafts moving apart relative to each other? a) 0.496c b) 0.467c c) 1.750c d) 0.143c e) 0.991c 10. How far apart must two objects on the moon be to be resolved by a telescope which has a 7.80-m diameter mirror? The wavelength of the light used is A610 nm, and the distance to the moon to be 3.80 x 105 km. a) 24.4 m b) 29.7 m c) 36.3 m d) 72.5 m e) 12.2 m 11. A converging lens with a focal length of (f₁ = 32.0 cm) is placed 42.0 cm to the left of a diverging lens with a focal length of (f2 = -25.5 cm). An object is placed 40.0 cm to the left of the converging lens. What is the location of the image produced by the combination of lenses? a) 32.5 cm to the right of the diverging lens b) 32.5 cm to the left of the diverging lens c) 160 cm to the left of the…

Incorrect Question 1 1/10 pts Eitan, Haley and Anthony are working at a particle accelerator facility. In one experiment, they observe that particles A and B collide head on at relativistic speeds. If the velocity of A is 0.764c to the left, and the velocity of B is 0.324c to the right (both of these speeds are measured in Earth's rest frame), how fast are the particles moving with respect to each other? 1,088

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