In a certain electroplating process gold is deposited by using a current of 14.0 A for 19 minutes. A gold ion, Au+, has a mass of approximately 3.3 × 10-22 g. How many grams of gold are deposited by this process?
A) 28 g B) 22 g C) 16 g D) 33 g E) 97 g
D
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From a particular location on Earth, why can we see many more total eclipses of the Moon than total eclipses of the Sun?
What will be an ideal response?
A parallel plate capacitor is connected to a battery and charged to voltage V. Leah says that the charge on the plates will decrease if the distance between the plates is increased while they are still connected to the battery. Gertie says that the charge will remain the same. Which one, if either, is correct, and why?
A. Gertie, because the maximum voltage is determined by the battery. B. Gertie, because the capacitance of the capacitor does not change. C. Leah, because the capacitance decreases when the plate separation is increased. D. Leah, because the capacitance increases when the plate separation is increased. E. Neither, because the charge increases when the plate separation is increased.
Because almost all galaxies show redshifted spectra, we know that
A) the sky must be dark at night. B) the universe is expanding. C) our understanding of redshift is wrong. D) we must be at the center of the universe. E) the universe is closed.
A student kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory:
A) both velocity and acceleration of the soccer ball are zero. B) neither the ball's velocity nor its acceleration is zero. C) the ball's acceleration is zero but not its velocity. D) the ball's acceleration points upwards. E) the ball's velocity points downwards.