Astronomers discover a planet orbiting around a star similar to our sun that is 35 light years away. How fast must a rocket ship go if the round trip is to take no longer than 70 years in time for the astronauts aboard

Explanation:

Given

Distance to the planet = 35 light years. So, the entire distance is: 2 * 35 = 70.

i.e time of travel of the ship.

For the observer on earth, the time is:

The required speed so that it does not take more than 70 years is then calculated using:

Substitute

So, we have:

Make v the subject of formula.

Square both sides

Cross Multiply

Divide both sides by

Divide through by

Make the subject

Inverse both sides

Take square root of both sides

Substitute values for and

c) up is the direction the magnetic force is acting on the charge.

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//