Mechanics | Relativity Answers

A car driving at 35.0 m/s takes 26 minutes to travel a certain distance according to the drivers clock in the car. How long does the trip take according to an observer at rest on Earth?

An astronaut at rest on Earth has a heart rate of 70 beats/min. When the astronaut is traveling in a spaceship at 0.90c, what will this rate be as measured by an observer also in the ship and an observer at rest on Earth?

A meter stick moving at 0.900c relative to the Earth's surface approaches an observer at rest with respect to the Earth's surface. What is the meter sticks length as measured by the observer? Qualitatively, how would the answer to that change if the observer started running toward the meter stick?

Imagine an astronaut on a trip to Sirius, which lies 8 light-years from Earth. Upon arrival at Sirius, the astronaut finds that the trip lasted 6 years. If the trip was made at a constant speed of 0.8c, how can the 8-light-year distance be reconciled with the 6-year duration?

List some ways or day-to-day lives would change if the speed of light were on 50 m/s.

It is said that Einstein, in his teenage years, asked the question, "What would I see in a mirror if I carried it in my hands and ran at a speed near that of light?" How would you answer this question?

A spacecraft with the shape of a sphere of diameter D moves past an observer on Earth with a speed of 0.5c. What shape does the observer measure for the spacecraft as it moves past?

a man walk 5.0m due east and then 10.0m N 30° E. find his resultant displacement.

a batsman hits a ball at 45 degree angle with horizontal and with a velocity of 20 m/s.the ball started to going over the bowler. a fielder from the mid-field ran to catch it. but the fielder could not reach in time . that's why the ball crosses the boundary line and it became a 6 run for the batsman.the ball travels 35 m at field. if the fielder is able to take catch at a height of 3 m , and if the fielder could reach in time to the boundary line, would he be able to catch the ball?

A wheel of mass 0.80kg and radius 0.30m is rolling without slipping up a plane 15 degrees to the horizontal . at some instant it has an angular speed of 12rad/s, and it comes momentarily to rest after rolling a further 2.5 revolutions up the plane. 1 Use the conservation of energy to find the moment of inertia of the wheel.