Two identical springs are attached to two identical masses. Both are resting on a frictionless horizontal surface. One of the springs is displaced a distance d from its equilibrium position, while the other is displaced a distance 2d
If both masses are released at the same instant,
which of the springs, A or B, returns to its
unstretched length first?
1.Spring A.
2.Spring B.
3.It's a tie.
4.Not enough information.
3
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Which of the following statements about various stages of core nuclear fusion (hydrogen, helium, carbon, and so on) in a high-mass star is not true?
A) Each successive stage lasts for approximately the same amount of time. B) As each stage ends, the core shrinks and heats further. C) Each successive stage creates an element with a higher atomic number and atomic mass number. D) As each stage ends, the reactions that occurred in previous stages continue in shells around the core.
X-ray bursts and gamma ray bursts have the same distribution pattern in the sky
Indicate whether the statement is true or false
Two stars, Betty and Wilma, are both on the main sequence. Betty is more luminous than Wilma
Which one has a hotter surface temperature? Which one is more massive? Which one is bigger? If they both formed at the same time, which one will evolve off the main sequence first?
A 7.0-? resistor is connected across the terminals of a battery having an internal emf of 10 V. If there is a 0.50-A current through the circuit, what is the internal resistance of the battery?
A) 13 ? B) 20 ? C) 10.8 ? D) 27.0 ?