A mass is oscillating on a spring with a period of 4.60 s. At t = 0 s the mass has zero speed and is at x = 8.30 cm. What is its speed at t = 2.50 s?

A) 10.9 cm/s
B) 3.06 cm/s
C) 3.32 cm/s
D) 1.80 cm/s
E) 0 cm/s

B

Physics & Space Science

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Answer the following statement true (T) or false (F)

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Whitney says that Gauss's law can be used to find the electric field of a sufficiently symmetrical distribution of charge as long as over the whole Gaussian surface. Algie says that the electric field must be a constant vector over the entire Gaussian surface. Which one, if either, is correct?

A.

Whitney, because that means no charge is enclosed within the Gaussian surface.

B.
Algie, because a constant electric field means that .

C.
Both, because the conditions in (a) and (b) are equivalent.

D.
Neither, because the electric field can be found from Gauss's law only if   holds only over a portion of the Gaussian surface.

E.
Neither, because the charge distribution must be symmetric if anywhere on the surface.

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Physics & Space Science

Which of the following situations would result in the longest days during the summer? (Assume an axis tilt of 0 degrees is an axis perpendicular to the ecliptic plane.)

A) axis tilt 0 degrees B) axis tilt -10 degrees C) axis tilt 23.5 degrees D) axis tilt 90 degrees

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An electron is released from rest at a distance of 9.00 cm from a proton. If the proton is held in place, how fast will the electron be moving

when it is 3.00 cm from the proton? (mel = 9.11 x 10-31 kg, e = 1.60 × 10-19 C, k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) 75.0 m/s B) 106 m/s C) 130 m/s D) 1.06 × 103 m/s E) 4.64 × 105 m/s

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Physics & Space Science