For the wave described by
, determine the x coordinate of the second maximum when t = 0.
A. 20 m
B. 18 m
C. 24 m
D. 28 m
E. 16 m
Answer: A
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In a rollercoaster, provided losses of thermal energy because of friction can be neglected because:
a. the mechanical energy increases as the car moves to the top of the slope. b. the mechanical energy decreases as the car moves to the top of the slope. c. the gravitational potential energy decreases as the car moves to the top of the slope. d. the kinetic energy decreases as the car moves to the top of the slope. e. the rollercoaster moves at constant speed as its height above the ground increases.
A spring with a spring constant of 8.0 N/m is compressed to 20 cm. If the spring is uncompressed initially, then the work done is
A. 0.12 J. B. 0.16 J. C. 0.19 J. D. 0.22 J. E. 0.26 J.
In a transformer, how many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns?
A) 458 B) 240 C) 110 D) 22 E) 4
What is the "cosmological constant?"
a. The universe has existed forever and on the average (over billions of cubic light years) does not change. b. This is the ratio between "dark energy" and "dark matter.". c. This is a quantity also referred to as "quintessence.". d. This is a self-admitted blunder in his theory of general relativity by Einstein, that might not be a blunder after all.