A virtual image occurs when
A. Light rays appear to come from a point they did not pass through
B. Light rays converge to form an image on a screen
C. The object is further from a converging lens than its focal point
D. None of the above
Ans: A. Light rays appear to come from a point they did not pass through
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From observations made of Uranus, scientists have discovered that belt-zone circulation is dominated by what planetary characteristic?
a. rotation b. orbital period c. direction of sunlight d. atmospheric elements e. interior heating
Do you think it is possible that a carbon star could harbor an advanced civilization? Explain your reasoning
What will be an ideal response?
A projectile is shot horizontally at 23.4 m/s from the roof of a building 55 m tall and experiences negligible air resistance
(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.
A spherical interplanetary grain of dust of radius 0.2 mm is at a distance r1 from the Sun. The gravitational force exerted by the Sun on the grain just balances the force due to radiation pressure from the Sun’s light. Suppose the grain is compressed so that it crystallizes into a sphere with significantly higher density, still at a distance r1. What is the net force exerted on the grain?
1.toward the Sun 2.away from the Sun 3.zero 4.impossible to determine without knowing the mass of the grain