One possible explanation for a galaxy's type invokes the angular momentum of the protogalactic cloud from which it formed. Suppose a galaxy forms from a protogalactic cloud with a lot of angular momentum
Assuming its type has not changed due to other interactions, we'd expect this galaxy to be ________.
A) a spiral galaxy B) an elliptical galaxy
C) a torn and incoherent galaxy D) an irregular galaxy
A
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A concave mirror has a focal length of 20 cm. A paraxial beam of light coming from a distant object forms its image at the focal point
If a small plane mirror is placed at the center of curvature with its reflecting side facing the focal point, where is the final image? A) 3 cm in front of the mirror B) 40 cm in front of the mirror C) 50 cm in front of the mirror D) 60 cm in front of the mirror E) 70 cm in front of the mirror
Why is the recoil less if a person holds a gun tightly against the shoulder?
A. The recoil is not less. Since momentum is conserved, the recoil is the same whether or not the gun is held tightly B. Your mass becomes part of the system, and since momentum is conserved, the velocity of the gun/person system is reduced C. If the gun is held tightly the bullet doesn’t travel as fast so conservation of momentum leads to a smaller recoil velocity of the gun.
The spring tide can occur at either ________ or ________ phases of the Moon
Fill in the blank(s) with correct word
Saturn's bands, oval storm systems, and turbulent flow patterns are powered by
A) convective motion and rapid rotation. B) the greenhouse effect. C) a liquid metallic hydrogen interior. D) the fusion in Saturn's core. E) the tides of Titan.