A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
a. 10 m/s; 9.8 m/s2.
b. 9.0 m/s; 9.8 m/s2.
c. 9.0 m/s; 9.0 m/s2.
d. 1.0 m/s; 9.0 m/s2.
e. 1.0 m/s; 9.8 m/s2.
a
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Series/Parallel Circuits: When unequal resistors are connected in series across an ideal battery,
A. the same power is dissipated in each one. B. the potential difference across each is the same. C. the current flowing in each is the same. D. the equivalent resistance of the circuit is less than that of the smallest resistor. E. the equivalent resistance of the circuit is equal to the average of all the resistances.
Refracting Telescope: The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm, respectively. The telescope is used to view Neptune and the final image is set at infinity. The diameter of Neptune is 4.96 × 107 m, and its distance from Earth at the time of observation is 4.4 × 1012 m. What is the angle (in milliradians) subtended by the final telescopic image of Neptune?
A. 0.90 mrad B. 1.1 mrad C. 1.3 mrad D. 1.5 mrad E. 1.7 mrad
Which of the following statements about quasars is not correct?
A. Their cores are extremely large, probably several thousand light-years across. B. Their spectra have the largest redshifts observed. C. They are probably the most distant observable objects. D. They have abnormally high luminosities. E. Sometimes they appear in pairs, due to gravitational lenses formed by intervening galaxies.
An amount of an ideal gas is taken around the process shown. Which of the following statements about the internal energy of the states is true?