A 250-kg motorcycle goes around an unbanked turn of radius 13.7 m at a steady 96.5 km/h. What is the magnitude of the net force on the motorcycle?
A) 719 N
B) 2.95 103 N
C) 1.31 104 N
D) 4.31 104 N
Question 2
Two spaceships approach each other along a straight line at a constant relative velocity of 0.9880c as measured by the captain of one of the ships. An observer on Earth is able to measure the speed of only one of the ships as 0.9000c.
From the point of view of the observer on Earth, what is the speed of the other ship in terms of the speed of light?
Evolution of the Sun's luminosity, radius and effective temperature compared to the present Sun
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