An astronaut leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. The astronaut's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year)
According to the astronaut, how long does the trip take? A) 14.4 y
B) 22.7 y
C) 9.34 y
D) 15.0 y
E) 4.20 y
E
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How many significant figures are in 0.0067?
A) 1 B) 2 C) 3 D) 4 E) 5
The equilibrium rule states that the vector sum of all forces acting on a
A) body at rest is zero. B) body in uniform motion is zero. C) non-accelerating body is zero. D) all of the above
Two friends are standing on opposite ends of a canoe. The canoe is initially at rest with respect to the lake. The person on the right throws a very massive ball to the left, and the person on the left catches it
After the ball is caught, the canoe is (ignore friction between the canoe and the water) A) stationary B) moving to the right. C) moving to the left.
The stars found in nebulae like the Orion Nebula probably formed
A) within the last few million years. B) about 10 million years ago. C) hundreds of millions of years ago. D) billions of years ago. E) at the beginning of the universe.