The momentum of an object never changes
Indicate whether the statement is true or false
F
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Although some photographs show what looks like jets of material near many young stars, we now know that these "jets" actually represent gas from the surrounding nebula that is falling onto the stars
Indicate whether the statement is true or false
Light having a speed in vacuum of 3.0 × 108 m/s enters a liquid of refractive index 2.0. In this liquid, its speed will be
A) 6.0 × 108 m/s. B) 3.0 × 108 m/s. C) 1.5 × 108 m/s. D) 0.75 × 108 m/s. E) 0.67 × 108 m/s.
In ?- decay, the number of neutrons in the nucleus is
A) decreased by 1. B) decreased by 2. C) increased by 1. D) increased by 2. E) remains unchanged.
What is an inverse-square relationship between force and distance?
a. A mathematical expression for the distance in terms of force instead of force in terms of distance, which is then squared. b. A relationship where increasing the distance by a factor increases the force by the square of the same factor. c. A relationship where one value decreases in proportion to the square of the factor by which the other value decreases. d. A relationship where the increasing the distance by a factor decreases the force by dividing it by the square of that same factor. e. A relationship where the square of force is proportional to the square of the distance.