A hypothesis that is scientific must have a test for proving it
A) right.
B) wrong.
C) either.
Answer: B
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A 0.20-m radius grinding wheel starts at rest and develops an angular speed of 12.0 rad/s in 4.0 s. What is the average tangential acceleration of a point on the wheel's edge?
a. 0.45 m/s2 c. 28 m/s2 b. 0.60 m/s2 d. 14 m/s2
The sun has apparent brightness B at the earth, which is 1.5 × 108 km away
What would be the apparent brightness of the sun at Pluto, which is 6.0 × 109 km from the sun? A) 0.063 B B) 0.00063 B C) 0.025 B D) 0.25 B
You take a roundtrip to a star located 1000 light-years away (so the roundtrip distance is 2000 light-years in Earth's reference frame) at an average speed of 0.99c. Based on the time dilation formula below, about how many years will pass on Earth while you are gone?
t' = t A) 2.8 years B) 10 years C) 28 years D) 2000 years E) 280 years
Process of Science: Think about some ways in which we might figure out how old things are that last for much longer than a human lifetime. What about for things that last longer than humans have existed?
What will be an ideal response?