Using a lever to move a rock reduces the force a person must exert. What does it do to the work the person must do?
a. it reduces the work also b. the work stays the same
c. the work increases d. none of the above
b
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What is viscous dissipation?
What will be an ideal response?
A wave barrier is produced in water when the speed of an object
A) matches the speed of waves in water. B) exceeds the speed of waves in water. C) is less than the speed of waves in water. D) none of the above
In order, from top to bottom, in the activity series come K, Zn, Pb, H, Cu, and Au. Therefore,
a. adding Pb to ZnCl2 will release Zn. b. adding Cu to HCl will release hydrogen. c. adding Au to HCl will release hydrogen. d. adding Cu to AuCl3 will release Au.
Because of __________, ___________, and ___________, physical interstellar travel is currently impossible
Fill in the blank(s) with correct word