A star begins fusing hydrogen to helium the moment it leaves the main sequence
Indicate whether the statement is true or false
F
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Which of the fields are physically impossible and why?
A. This field violates the Ampere-Maxwell law. B. This field violates Gauss’s law for the magnetic field. C. The field violates both of the above laws. D. This field is physically possible.
(a) A force of 15 N applied to a spring compresses it by 4 cm. What is the potential energy of the spring in the compressed position?
(b) A force of 15 N applied to a spring stretches it by 4 cm. What is the potential energy of the spring in the stretched position?
You have discovered a new asteroid, which has a moon in an elliptical orbit around it
From a series of observations, you establish that the closest approach occurs when the moon is 51,000 m from the asteroid, the furthest separation is 102,000 m, and the speed of the moon at the point of closest approach is 7.50 m/s. What is the mass of the asteroid? G = 6.67 x 10-11 N•m2/kg2.A) 4.25 × 1016 kg B) 9.87 × 1016 kg C) 3.22 × 1016 kg D) 2.04 × 1016 kg E) 5.05 × 1016 kg
In the case of constant acceleration, the average velocity equals the instantaneous velocity:
a. at the beginning of the time interval. b. at the end of the time interval. c. half-way through the time interval. d. three-fourths of the way through the time interval.