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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(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
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.
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.