Arvin the Ant travels 30 cm eastward, then 25 cm northward, and finally 10 cm westward. In what direction is Arvin now in with respect to his starting point?
a. 59° N of E b. 29° N of E
c. 29° N of W d. 51° N of E
d
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Significant Figures: Express the sum of 420.77, 13.821, and 2317.8 to the correct number of significant figures.
Fill in the blank(s) with the appropriate word(s).
An instructor fires an arrow into a wooden block suspended by strings, as shown. If the mass of the arrow is 1/10 the mass of the block, what is the momentum of the arrow relative to the momentum of the block after the arrow has fully penetrated the block and is moving with it?
a. The same. b. The momentum of the arrow is 1/10 that of the block. c. The momentum of the arrow is ten times that of the block. d. The momentum of the arrow is 100 times that of the block because the kinetic energy is ½mv2. e. The momentum of the arrow is 1/100 times that of the block because the kinetic energy is ½mv2.
Should we expect to find abundant amounts of gold and other rare-earth elements elsewhere in the universe?
What will be an ideal response?
A rock suspended by a weighing scale weighs 3 N when submerged in water and 5 N out of water. What is the buoyant force on the rock?
A) 8 N B) 5 N C) 3 N D) 2 N E) none of the above