If the human eyeball is too short from front to back, this gives rise to a vision defect that can be corrected by using
A) convex-convex eyeglasses.
B) concave-convex eyeglasses.
C) cylindrical eyeglasses.
D) contact lenses, but no ordinary lenses.
E) shaded glasses (i.e., something that will cause the iris to dilate more).
A
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Star clusters are important to the study the stellar evolution because stars in a given cluster have the same
a. temperature. b. mass. c. age. d. luminosity.
An educated scientific guess is a
A) hypothesis. B) theory. C) either of these D) neither of these
A toy rocket, launched from the ground, rises vertically with an acceleration of 20 m/s2 for 6.0 s until its motor stops. Disregarding any air resistance, what maximum height above the ground will the rocket achieve?
A. 1.1 km B. 0.73 km C. 1.9 km D. 0.39 km E. 1.5 km
You see a positively charged helium ion in space, and it is at rest with respect to your spacecraft. Since you are studying for the final exam, you decide to experiment. You slowly push the N pole of a bar magnet closer to the helium ion. What happens to the helium ion?
A. It depends on whether it is a positive ion or a negative ion B. It experiences a magnetic force and moves off C. Nothing happens, because the ion is not moving