Relative to the comet, the direction of the ion tail tells us
A) the direction of the Sun.
B) the direction the comet is traveling.
C) where the ecliptic is.
D) where the comet came from.
E) the velocity of the comet.
A
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As you walk away from a plane mirror on a wall, your image
A) gets smaller. B) may or may not get smaller, depending on where the observer is positioned. C) is always a real image, no matter how far you are from the mirror. D) changes from being a virtual image to a real image as you pass the focal point. E) is always the same size.
A(n) ______________ is an elementary particle with a charge of +1.6 × 10^-19 coulomb
Fill in the blank(s) with correct word
A person's eye lens is 2.8 cm from the retina, and his near point is at 25 cm. What must be the focal length of his eye lens so that an object at the far point of the eye will focus on the retina?
A) -2.8 cm B) 2.8 cm C) -2.4 cm D) 2.4 cm E) 2.2 cm
At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is
A) 25 m/s. B) 50 m/s. C) 55 m/s. D) 60 m/s. E) 100 m/s.