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Physics: Vehichles travelling different directions collide, what is the resulting velocity?

February 13, 2009 – 2:17 pm

Lindsey P asked: If one vehicle driving 30 meters/second collides with another travelling in the opposite directing at 20 meters/second in a front end collision, assuming they both have a mass of 1000 Kg, what is the resulting velocity?Tour guide

By imhar | Comments (1)

How long would it take for me to get to Neptune if I was travelling close to the speed of light?

January 23, 2009 – 2:26 pm

Soda Tears asked: Say 95% the speed of light. Neptune is a minimum of 4.3 billion km away from Earth.
So if I was travelling at 285 000 000 m/s, I would only need 13 seconds to reach Neptune, am I right?
oops I got the units mixed up
so its 4 hours 11 minutes 27 seconds ?Tour [...]

By imhar | Comments (5)

How does a clock go slower if it is travelling at high speed?

December 24, 2008 – 3:17 am

MajorSparky asked: Einstein says that a clock travelling at high speed (near the speed of light) will go slower than a `stationary’ clock. It has been demonstrated that a clock returning to earth from an orbiting satellite shows less time than a stationary, earth bound, clock. How come? Velocity is relative. I.e. the earth bound [...]

By imhar | Comments (11)

You are travelling downward in an elevator and are slowing to a stop. How does the normal force on your feet c

December 23, 2008 – 9:58 am

mike asked: You are travelling downward in an elevator and are slowing to a stop. How does the normal force on your feet compare to your weight at this time? How do you know?Tour guide

By imhar | Comments (2)

If you are travelling just below the speed of light and you shine a torch in front of you what happens?

December 17, 2008 – 10:48 pm

Peter D asked: If you are travelling just below the speed of light and you shine a torch in front of you what happens? Does it travel at your speed plus the speed of light or does the light appear to move very slowly away from you? Also if you turn around and shine [...]

By imhar | Comments (3)