A 0.16-pF parallel-plate capacitor is charged to 10 V. Then the battery is disconnected from the capacitor. When 1.00 × 10^7 electrons are now placed on the negative plate of the capacitor, the voltage between the plates changes by

a. ?5.0 V.
b. ?1.1 V.
c. 0 V.
d. +1.1 V.
e. +5.0 V.

e

Physics & Space Science

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Projectile Motion: A projectile is fired from ground level at an angle above the horizontal on an airless planet where g = 10.0 m/s2. The initial x and y components of its velocity are 86.6 m/s and 50.0 m/s respectively. How long after firing does it take before the projectile hits the level ground?

A. 5.00 seconds B. 10.0 seconds C. 15.0 seconds D. 20.0 seconds

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Physics & Space Science

Two pipe columns are required to have the same Euler buckling load Pcr. Column 1 has flexural rigidity EI1 and height L; column 2 has flexural rigidity (2/3) EI2 and height L. The ratio (I2/I1) at which both columns will buckle under the same load is approximately:

(A) 0.8
(B) 1.0
(C) 2.2
(D) 3.1

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Physics & Space Science

A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, its frequency:

1.increases. 2.decreases. 3.stays constant.

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Physics & Space Science

Which of the following statements about the atomic theory of matter is true?

Einstein helped prove the atomic theory by explaining x-ray production in 1905. The atomic theory of matter was universally accepted at the end of the nineteenth century. Proust put forth the law of definite masses, saying that a compound is made up of numbers of atoms so that the total of each element has equal mass. Dalton proposed that atoms of each element have characteristic properties. Atoms were originally thought of as particles, but the work of Dalton and Brown helped prove that atoms were waves.

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Physics & Space Science