| 1. |
the speed of light is 3x10 5 km s. A star 4.3 light years away. If you have a spacecraft which travels 500 km h, how long would it take you to get from earth to the solar system |
|
Answer» ht year is the distance TRAVELED by light in 1 year.SPEED of light = 3 × 10⁸ m/s = 3 × 10⁸ km/hr × 18/5 = 54/5 × 10⁸ km/hr = 10.8 × 10⁸ km/hrIn 1 hr , it travels 10.8× 10⁸ km .In 1 year , there are 24 × 365 hrs = 8760 hrsSo light travels 8760 × 10.8 ×10⁸ km in 1 year.Distance of 1 light year = 94608 × 10⁸ km = 94.608 × 10¹¹ kmNow distance of 4.3 light years means :94.608 × 10¹¹ km × 4.3= 406.814 × 10¹¹ kmDistance = 40.681 × 10¹² km .Speed = 500 km/hrSpeed = distance / time= > time = distance / speed = 40.861 × 10¹² / 500 hr = 0.8136 × 10¹² hr = 8.136 × 10¹⁰ hr ANSWER:8.136 × 10¹⁰ hours will be TAKEN . |
|