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.
Answer: C
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You are given two converging lenses to build a compound microscope. Lens A has focal length 0.50 cm and lens B has focal length of 3.0 cm. Which one of the two lenses would you use for the objective?
A) Lens A, because it has the shorter focal length. B) Lens B, because it has the longer focal length. C) It makes no difference which lens I use for the objective. D) None, because the objective should be a diverging lens.
Which rocket would require more fuel?
A) one going from the Moon to Earth. B) one going from Earth to the Moon. C) both the same.
Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the longer sides and is parallel to the shorter sides?
a. 2.7 kg/m2 b. 3.6 kg/m2 c. 3.1 kg/m2 d. 4.1 kg/m2 e. 1.6 kg/m2
Which of the following is not an example of condensation at Earth's surface?
A) clouds B) dew C) frost D) fog