What do asteroids and comets have in common?
A) They have similar densities.
B) They have similar orbital radii.
C) Most are unchanged since their formation in the solar nebula.
D) They have a similar range of orbital inclinations.
E) They have nothing in common with each other.
C
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Why is the angular magnification of a microscope negative?
A. The image is smaller than the object. B. The image is inverted. C. The focal length is negative D. The eyepiece focal length is less than the objective focal length.
What was the primary role of dust in the formation of the solar system?
A) Dust formed the rings around Uranus, Neptune, and Jupiter. B) Dust veiled the process by which our solar system formed. C) Dust acted as condensation nuclei; platforms to which other particles could attach and form larger particles of matter. D) The Sun formed from a vast spinning cloud consisting only of dust. E) Dust provided the radioactive elements that initially heated the Sun.
In an experiment to measure the thermal conductivity of a certain material, a slab of material 10.0 mm thick separates a steam chamber from a block of ice with a square cross-section of 8.00 cm × 8.00 cm
In 5.00 minutes of running the experiment, 64.0 g of ice have melted. What is the coefficient of thermal conductivity of this material? The latent heat of fusion of water is 33.5 × 104 J/kg. A) 0.130 W/m/K B) 0.250 W/m/K C) 0.440 W/m/K D) 0.620 W/m/K E) 1.10 W/m/K
A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about the circuit?
A) Once the capacitor is essentially fully charged, there is no current in the circuit. B) The potential difference across the resistor is always equal to the potential difference across the capacitor. C) Current flows through the circuit even after the capacitor is essentially fully charged. D) The capacitor charges to its maximum value in one time constant. E) The capacitor charges to its maximum value in two time constants.