Which of the following occupies the smallest percentage of the electromagnetic spectrum?
A) radio waves
B) microwaves
C) visible light
D) gamma rays
Answer: C
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The most basic difference between elliptical galaxies and spiral galaxies is that
A) elliptical galaxies lack anything resembling the disk of a spiral galaxy. B) elliptical galaxies lack anything resembling the halo of a spiral galaxy. C) spiral galaxies lack anything resembling the distribution of stars in an elliptical galaxy. D) elliptical galaxies are old and spiral galaxies are young.
A 50.0-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 26.0° below the horizontal is applied to the box
What is the minimum coefficient of static friction between the box and the surface required for the box to remain stationary? A) 0.441 B) 0.654 C) 0.375 D) 0.866 E) 0.406
In order to overcome a surface tension of a fluid, a force of 1.35 × 10^?2 N is required to lift a wire ring of circumference 13.0 cm. What is the surface tension of the fluid?
a. 0.052 N/m b. 0.104 N/m c. 0.552 N/m d. 5.19 N/m e. 17.6 N/m
Why are collisions between asteroids in the asteroid belt rare?
A) The average distance between asteroids is millions of kilometers. B) All asteroids orbit in perfect circular orbits at the same speed. C) Jupiter's gravity keeps asteroids apart. D) The gas surrounding the asteroids help them repel each other before colliding. E) There are only a few asteroids in the solar system.