According to current models, where does the element gold come from?
A) mergers of neutron stars
B) the supernova explosions of high-mass stars
C) the late stages of fusion in low-mass stars
D) the Big Bang
A) mergers of neutron stars
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Fig. 15-5 shows four Gaussian surfaces surrounding a distribution of charges. Which Gaussian surfaces have an electric flux of +q/?o through them?
(1) a.
(2) b.
(3) b and d.
(4) c.
(5) b and c.
What is the underlying cause of air motion?
What will be an ideal response?
A single crystal of BCC niobium is oriented in a tensile test so that the [001] crystal direction is parallel to the load axis.
A projectile is shot horizontally at 23.4 m/s from the roof of a building 55.0 m tall. (a) Determine the time necessary for the projectile to reach the ground below
(b) Determine the distance from the base of the building that the projectile lands. (c) Determine the horizontal and vertical components of the velocity just before the projectile reaches the ground.