In a ballistics test, a 28-g bullet pierces a sand bag that is thick
If the initial bullet velocity was and it emerged from the sandbag moving at what was the magnitude of the friction force (assuming it to be constant) that the bullet experienced while it traveled through the bag? A) 130 N
B) 38 N
C) 13 N
D) 1.3 N
A
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Two bodies with masses m1 and m2 are both moving east with velocities of magnitudes v1 and v2, where v1 is less than v2. The magnitude of the velocity of the center of mass of this system of two bodies is
A. less than v1. B. equal to v1. C. equal to the average of v1 and v2. D. greater than v1 and less than v2. E. greater than v2.
Basalt is a common type of
A) meteoritic rock B) sedimentary rock C) igneous rock D) metamorphic rock
What is the average distance between the Sun and Earth?
a. 20 AU b. 10 AU c. 5 AU d. 2 AU e. 1 AU
Refer to the figure above. What can you conclude from the data shown on this graph alone?
A) The carbon dioxide concentration varies naturally, but is much higher today than it has been in the past 800,000 years. B) Human activity has caused the carbon dioxide concentration to rise and fall many times in the past 800,000 years. C) Changes in the carbon dioxide concentration are the causes of ice ages. D) If current trends continue, carbon dioxide will soon be the most abundant gas in Earth's atmosphere.