What can be said about the tonight's night sky in these two places?

a. The sky will have completely different sets of constellations.
b. The sky will look about the same.
c. The sky will have partially different sets of constellations.


Answer: b. The sky will look about the same.

Physics & Space Science

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Energy in Capacitors: Two parallel circular plates, each with a radius of 7.0 mm and carrying equal-magnitude surface charge densities of ±3.0 ?C/m2, are separated by a distance of 1.0 mm with only air between them. How much energy is stored in these plates? (?0 = 8.85 × 10-12 C2/N ? m2)

A. 78 nJ B. 25 nJ C. 7.9 nJ D. 250 nJ

Physics & Space Science

Two circus clowns (each having a mass of 50 kg) swing on two flying trapezes (negligible mass, length 25 m) shown in the figure. At the peak of the swing, one grabs the other, and the two swing back to one platform. The time for the forward and return motion is ? ?

A. 10 s. B. 50 s. C. 15 s. D. 20 s. E. 25 s.

Physics & Space Science

Cart A with momentum p (in magnitude) and speed 2v collides with cart B at rest. After the collision, cart A has speed v and cart B has speed 3v, as shown. What can you say about the momentum of cart B after the collision?

Physics & Space Science

The free-stream flow outside a boundary layer is:

(A) Either laminar or turbulent, depending on the Reynolds number (B) A smooth flow free of disturbances (C) An irrotational flow (D) Neither laminar nor turbulent

Physics & Space Science