If we imagine the history of the universe compressed into one year, dinosaurs became extinct

A) about 6 months ago.
B) about 3 weeks ago.
C) yesterday morning.
D) about an hour ago.


C

Physics & Space Science

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Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The potential energy of the crate is __________

Fill in the blank(s) with correct word

Physics & Space Science

If R = 4.0 k?, C = 3.0 mF, ? = 15 V, Q = 12 mC, and I = 2.0 mA, what is the potential difference Vb ? Va?



a.
+3.0 V

b.
?19 V

c.
?3.0 V

d.
+27 V

e.
+21 V

Physics & Space Science

A helicopter stays aloft by pushing large quantities of air downward every second. What mass of air must be pushed downward at 35.0 m/s every second to keep a 1 500-kg helicopter aloft?

a. 42.9 kg b. 420 kg c. 430 kg d. 410 kg e. 415 kg

Physics & Space Science

What is the total number of individual atoms in a water molecule?

A) one B) two C) three D) four E) none

Physics & Space Science