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
(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?
Answer: (a) 600 N (b) 1.2 × 105 Pa
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Astronomers have found evidence that the expansion of the Universe is accelerating. Such acceleration
A. is deduced because distant galaxies are receding faster than expected from the Hubble law. B. was predicted by the Big Bang model in cosmology. C. is evidence for a cosmic repulsion related to the cosmological constant of relativity theory. D. is deduced because nearby galaxies are receding faster than expected from the Hubble law.
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A sample of matter that contains atoms that all have the same number of protons is
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