In a ballistics test, a 28-g bullet pierces a sand bag that is 30cm thick
If the initial bullet velocity was 55m/s and it emerged from the sandbag moving at 18m/s what was the magnitude of the friction force (assuming it to be constant) that the bullet experienced while it traveled through the bag?
A) 1.3 N B) 130 N C) 38 N D) 13 N
B
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Add the following lengths, each obtained from a different measuring instrument, and round off the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m
What will be an ideal response?
An individual's eye pupil changes from a diameter of 1.5 mm to 3.5 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
a. 2.0 c. 0.43 b. 2.3 d. 0.65
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Answer the following statement true (T) or false (F)
Which of the following is true of the scientific names of constellations?
A) They are in Latin or Greek. B) They are in French or Italian. C) They are in Hebrew or Arabic. D) They are in Sumerian or Mayan.