A 3.0-kg block is dragged over a rough horizontal surface by a constant force of 16 N acting at an angle of 37° above the horizontal as shown. The speed of the block increases from 4.0 m/s to 6.0 m/s in a displacement of 5.0 m. What work was done by the friction force during this displacement?
a.
?34 J
b.
?64 J
c.
?30 J
d.
?94 J
e.
+64 J
a
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Florence, who weighs 120. lbs, stands on a bathroom scale in an elevator. What will the scale read when the elevator is accelerating downward at 2.0 m/s2?
A) 86. lb B) 1.4 × 102 lb C) 1.2 × 102 lb D) 96. lb E) 1.56 × 102 lb
In the respiration reaction
A) carbon combines with such biological molecules as DNA. B) oxygen combines with the carbon in such biological molecules as glucose. C) CO2 combines with the carbon in such biological molecules as glucose. D) CO2 combines with H2O. E) oxygen combines with such biological molecules as DNA.
People can snorkel down to a depth of roughly one meter. This means that the additional pressure on the air in their lungs is roughly
a. 9800 N. b. 9800 Pa. c. 9800 ATM. d. 19,600 N. e. 19,600 N/m2.
Materials that have a large magnetic susceptibility and are insulators are _________.
Fill in the blank(s) with the appropriate word(s).