The apparent motion of an object when it is viewed from two different positions against a fixed background is called
a. Hubble's effect.
b. parallax.
c. paradox.
d. Brighton's effect.
b
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Which of the following statements is not true about the sky at Earth's equator?
A) Over the course of the year, all 88 constellations will at some point be visible in the evening sky. B) There are no circumpolar stars in the equatorial sky. C) The Sun will pass directly overhead around noon each day. D) The north celestial pole is directly on your horizon, due north (with Polaris quite nearby).
A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction. What is the tension in each cable?
A) 231 N B) 400 N C) 800 N D) 2560 N E) 3920 N
In what part of Earth's atmosphere do we live?
a) the heterosphere b) the stratosphere c) the ionosphere d) the troposphere
Because of the equivalence of mass and energy, an electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass
Indicate whether the statement is true or false