An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 107 m/s. What is the radius of the circle? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A) 1.5 mm
B) 0.22 mm
C) 2.2 mm
D) 0.39 mm
E) 3.9 mm
E
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Projectile Motion: A cat leaps to try to catch a bird. If the cat's jump was at 60° off the ground and its initial velocity was 2.74 m/s, what is the highest point of its trajectory, neglecting air resistance?
A. 0.29 m B. 0.58 m C. 10.96 m D. 0.19 m
Process of Science: How can we test hypotheses about something that is postulated to exist in the past but that no longer exists today, such as free-flowing water on Mars?
What will be an ideal response?
The pupil of a cat's eye narrows to a slit width of 0.5 mm in daylight. What is the angular resolution of the cat's eye in daylight (? = 500 nm)?
A. 0.01 rads B. 10?5 rads C. 10?3 rads D. 10?4 rads E. 0.1 rads
Which of the following might explain the lack of "water worlds" (planets made mostly of water or other hydrogen compounds) in our own solar system?
A) In our solar system, the solar wind did not clear out gas until relatively late. B) There was not enough water in our solar system. C) Small worlds in our solar system formed only close to the Sun, where it was too hot for hydrogen compounds to condense. D) Water worlds can form only in systems in which all planets have highly elliptical (eccentric) orbits. Fill in the blank(s) with the appropriate word(s).