Pascal's Principle: The small piston of a hydraulic lift has a diameter of 8.0 cm, and its large piston has a diameter of 40 cm. The lift raises a load of 15,000 N. Assume the pistons each have negligible weight.(a) Determine the force that must be applied to the small piston.(b) Determine the pressure applied to the fluid in the lift.
What will be an ideal response?
(a) 600 N (b) 1.2 × 105 Pa
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When a planet moves closer to the Sun in an elliptical orbit, its rotational inertia about the sun
A. gets smaller because its distance from the Sun is smaller. B. gets larger because the angular momentum must be conserved. C. gets smaller because the lever arm is shorter. D. gets larger because the planet has more angular acceleration. E. does not change because the mass of the planet is constant.
Which of the following developed the theory that the planets circle the sun rather than circling Earth?
A) Copernicus B) Kepler C) Ptolemy D) Brahe E) Galileo
You have a parallel circuit in a house that operates on 120 V with several outlets for plugging in appliances and it has a 20 A fuse in the circuit. What is the maximum number of 600-W appliances that can be plugged into the outlets without "blowing" the fuse? Assume that if the current flow exceeds the rating of the fuse, it will blow
a. 2 b. 4 c. 5 d. 7
How do the size and mass of Jupiter's core compare to the size and mass of Earth?
A) It is the same size and mass.
B) It is about 10 times larger in size and the same mass.
C) It is about the same size but is 10 times more massive.
D) It is about 10 times larger both in size and mass.
E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.