A boat that contains a heavy anchor floats in a small lake. If the anchor is thrown overboard, but the rope isn't long enough for the anchor to touch bottom, which of the following will happen?
(i) The level of the water in the lake will go down slightly.
(ii) The level of the water in the lake will go up slightly.
(iii) The level of the water in the lake will stay exactly the same.
(iv) The waterline on the boat will go up (that is, the boat will sink slightly).
(v) The waterline on the boat will go down (that is, the boat will rise slightly).
(vi) The water line on the boat will stay the same.
1.(i) and (v)
2.(ii) and (iv)
3.(iii) and (vi)
4.(iii) and (v)
4
You might also like to view...
How are wavelength, frequency, and energy related for photons of light?
A) Longer wavelength means higher frequency and lower energy. B) Longer wavelength means lower frequency and lower energy. C) Longer wavelength means lower frequency and higher energy. D) Longer wavelength means higher frequency and higher energy. E) There is no simple relationship because different photons travel at different speeds.
Two isotopes have the same __________ number
Fill in the blank(s) with correct word
Why do Venus and Earth have the youngest surfaces?
A. Mercury and Mars formed earlier than Earth and Venus. B. Both Venus and Earth have active interiors that recycle the planets' crusts. C. Both have liquid water that erode the planets' surfaces. D. Venus and Earth have been bombarded by impactors that have renewed their surfaces.
Motional Emf: A long vertical wire carries a steady 70 A current. As shown in the figure, a pair of horizontal rails are 0.20 m apart. A 20-? resistor connects points a and b, at the end of the rails. A bar is in contact with the rails, and is moved by an external force with a constant horizontal velocity of 0.90 m/s to the right, as shown. The bar and the rails have negligible resistance. At the instant that the bar is 0.20 m from the wire, what are the induced current in the resistor and its direction through the resistor? (?0 = 4? × 10-7 T ? m/A)
A. 0.63 ?A, from a to b B. 0.63 ?A, from b to a C. 0.32 ?A, from a to b D. 0.32 ?A, from b to a E. 1.9 ?A, from b to a