Which is the formula for baking soda?
a. NaHCO3
b. NaOH
c. (NH4)2 SO4
d. HC2H3O2
a
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Based on our current understanding of physics, we can understand the conditions that prevailed in the early universe as far back in time as about
A) 380,000 years after the Big Bang. B) one ten-billionth of a second after the Big Bang. C) 10-45 seconds after the Big Bang. D) 10 billion years ago.
Can an object's velocity change direction when its acceleration is constant?
A) Yes, this is possible, and a rock thrown straight up is an example. B) No, this is not possible because it is always speeding up. C) No, this is not possible because it is always slowing up. D) Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example. E) No, this is not possible because it is always speeding up or always slowing down, but it can never turn around.
Inelastic collisions occur when
A. The masses are all the same B. There is no compression during the collision C. Bonds between the objects are broken D. The objects stick together
If you draw a spacetime diagram, how will the worldline of an object that is accelerating away from you appear?
A) vertical B) horizontal C) slanted D) curved E) a circle