Aspaceship is built to reach a star system 15 light-years away.
(a) how fast must the spaceship move (in units of c) so that the round trip time experienced by the crew is 20 years?
(b) how much time would the round trip take as measured by observers on earth?
Solved
Show answers
More tips
- S Style and Beauty Autotanning: Harmful or Safe?...
- A Art and Culture The History and Characteristics of Jazz Bands: A Deep Dive...
- F Food and Cooking From Latte to Espresso: Which Coffee Drink is the Most Popular on Earth?...
- C Computers and Internet How to Set Up Internet on iPhone? Detailed Guide with Step-by-Step Instructions...
- F Family and Home How to Teach Your Child to Speak: Tips and Recommendations...
- P Philosophy Agnosticism: Opinion or Belief?...
- S Style and Beauty How to choose the best mascara for your eyelashes...
- F Food and Cooking Discover Delicious Recipes You Can Make with Ground Meat...
- C Computers and Internet Google Search Tips and Tricks: Everything You Need to Know...
- S Science and Technology Why is there no gravity on other planets?...
Answers on questions: Physics
- P Physics What brings greater concentration of dissolved nutrients to ocean surface upwelling warmer water salinity photosynthesis...
- P Physics What is potential energy? Energy of velocity. Energy of motion. Energy that is stored. Energy that is uncontrollable....
- P Physics Usain Bolt is notoriously the fastest man on Earth. When he broke the world record, he had a mass of 94kg and ran at a speed of 10.44 m/s. What would be his Kinetic Energy?...
- P Physics A baseball player hits a pop up that launches 45m vertically in the air. If a baseball has a mass of 0.145kg. What would be the Gravitational Potential Energy (GPE) of...
- P Physics How much force is applied to the left side of an object (pushing right- ) if a 95 N force is applied to the right side (pushing left -) and the net force is 52 N - pushing...
- P Physics (2 Passengers with an unknown total mass climb into the lift. The lift accelerates upwards at 1.25 m.8, while the cable that supports the lift exerts a constant upward...
- P Physics Three vectors 3ms-1 N45 W, 12ms-1 W, and 5m-1 act at a point Sketch a vector diagram to illustrate the given information Calculate the resultant of the vector...
- P Physics Weight of a body is 100N, it s weight on the moon is...
- P Physics Suppose that 2 J of work is needed to stretch a spring from its natural length of 32 cm to a length of 40 cm. (a) How much work is needed to stretch the spring from 34...
- P Physics A yoyo toy is released from rest while the top of the string remains stationary. The mass of the toy is 0.081 kg, its radius is 0.053 m and its moment of inertia is 2.4...
Ответ:
a) 0.72c b) 57.63 years
Explanation:
First you need to know that 1 light year is equivalent to 9.46*10^15m, so 15 light years are 1.374*10^17 m. Now 20 years are equivalent to (20)*(365)*(24)*(60)*(60) seconds = 6.3*10^8 seconds. So dividing the distance by the time you have 2.18*10^8 m/s. And you know that c = 3*10^8, so dividing the velocity by c, you have that the spaceship travels at 0.72c. With the dilation time factor you can calculate (b), the equation is t/sqrt(1-(v^2/c^2)). where t is the time (40 years) and v the velocity (0.72c), so substituting you have 57.63 years, that is the time observed in the earth.
Ответ:
myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.