Based on this graph, which statement below most accurately describes the impacts we should expect on Earth during the coming year?
A. Only objects smaller than 1 meter across will hit Earth.
B. Earth will be hit by at least one object a few meters in diameter, along with many smaller objects.
C. Earth will be hit by one object that is a few meters in diameter, but no larger or smaller objects.
D. Earth will be hit by one object about 100 meters in diameter and several objects of about 10 meters in diameter.
Ans: B. Earth will be hit by at least one object a few meters in diameter, along with many smaller objects.
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In beta minus 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.
The Sun's average surface (photosphere) temperature is about ________
A) 1,000 K B) 5,800 K C) 1,000,000 K D) 37,000 K
In a certain nuclear reactor, neutrons suddenly collide with carbon nuclei, which have 12 times the mass of neutrons
In a head-on elastic collision with a stationary carbon nucleus, what fraction of its initial speed does the neutron have after the collision? A) 11/13 B) 11/12 C) 10/13 D) 1/12 E) 5/6
Simple harmonic oscillations can be modeled by the projection of circular motion at constant angular velocity onto a diameter of the circle. When this is done, the analog along the diameter of the acceleration of the particle executing simple harmonic motion is
a. the displacement from the center of the diameter of the projection of the position of the particle on the circle. b. the projection along the diameter of the velocity of the particle on the circle. c. the projection along the diameter of tangential acceleration of the particle on the circle. d. the projection along the diameter of centripetal acceleration of the particle on the circle. e. meaningful only when the particle moving in the circle also has a non-zero tangential acceleration.