A parallel-plate capacitor has a capacitance of 25 µF. What potential difference across the plates is required to store 7.2 × 10^?4 C on this capacitor?
a. 2.9E+1 V
b. 3.6E+1 V
c. 4.5E+9 V
d. 2.9E–1 V
e. 4.5E+5 V
a
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How do we learn the chemical composition of the interstellar medium?
A) We make an educated guess based on the Sun's composition. B) By studying spectra of interstellar gas clouds. C) We collect samples of gas and dust from interstellar space. D) We use computer simulations of the interstellar medium.
Stefan's law notes that total energy radiated is proportional to the ________ power of the temperature of the blackbody
Fill in the blank(s) with correct word
Suppose that a grandfather clock is calibrated correctly at sea level and is then brought up to the top of a tall mountain. What would need to be done to calibrate the clock at the top of the mountain?
1.Nothing, it should work fine since it was already calibrated at sea level. 2.The bob of the pendulum should be slid slightly down the rod. 3.The bob of the pendulum should be slid slightly up the rod. 4.It cannot be calibrated at the top of the mountain.
Which of the following statements is not a prediction of the general theory of relativity?
A) Time runs slightly slower on the surface of the Sun than on the surface of Earth. B) The Universe has no boundaries and no center. C) The curvature of spacetime can distort the appearance of distant objects. D) Different observers can disagree about the fundamental structure of spacetime. E) A binary star system with two stars orbiting each other rapidly emits gravitational waves.