Consider a merry-go-round which makes 20. revolutions in 4.0 minutes. (a) What is the average angular speed in radians/s? (b) For a child 3.5 m from the center, how far does he travel in the 4.0 minutes?
What will be an ideal response?
(a) 0.52 rad/s
(b) 0.44 km
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The heavier elements on Earth (those with atomic numbers greater than 5):
were in existence at the moment of the big bang. were formed immediately after the big bang. are formed by stellar nucleosynthesis during the life cycles of existing stars. are constantly being created by fusion in our Sun and blown here by the solar wind. All of the above are true statements.
What is the equivalent resistance between points A and B in the figure when R = 18 ??
A. 48 ? B. 64 ? C. 80 ? D. 96 ? E. 110 ?
Brick A is dropped from the top of a building. Brick B is thrown straight down from the same building, and neither one experiences appreciable air resistance. Which statement about their accelerations is correct?
A) The acceleration of A is greater than the acceleration of B. B) The acceleration of B is greater than the acceleration of A. C) The two bricks have exactly the same acceleration. D) Neither brick has any acceleration once it is released.
If an electron is accelerated from rest through a potential difference of 1500 V, what speed does it reach? (e = 1.60 × 10-19 C , melectron = 9.11 × 10-31 kg)
A) 2.3 × 107 m/s B) 1.9 × 107 m/s C) 1.5 × 107 m/s D) 1.1 × 107 m/s