When a heavy barge floats above a fish swimming in the water below, does the PRESSURE exerted upon the fish change (and why)?
What will be an ideal response?
NO. The barge displaces just enough water to equal its weight. The barge can be replaced by water up to the water surface and the weight of that overlying material is the same upon the fish.
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As the ac frequency in an RLC circuit is increased to very high values, which of the contributions to the impedance dominates?
A. the capacitive reactance B. the inductive reactance C. the resistance D. the combined capacitive reactance and the resistance E. More information is needed.
A sample of helium (He) occupies 44.8 L at STP. What is the mass of the sample?
A) 2 g B) 4 g C) 6 g D) 8 g E) 10 g
Which of the following must be true for differentiation to occur in a planet?
A) The planet must have a rocky surface. B) The planet must be made of both metal and rock. C) The planet must have an atmosphere. D) The planet must be geologically active, that is, have volcanoes, planetquakes, and erosion from weather. E) The planet must have a molten interior.
Suppose you are facing north and you see the Big Dipper close to your northern horizon, with Polaris (and the Little Dipper) above it. Where will you see the Big Dipper in six hours?
A) to the right of Polaris; that is, 90 degrees counterclockwise from its current position B) to the left of Polaris; that is, 90 degrees clockwise from its current position C) directly above Polaris D) still in the same place, below Polaris