Which telescope has the largest light-gathering power among the following telescopes?
A) A telescope of diameter 5 cm and focal length 50 cm
B) A telescope of diameter 6 cm and focal length 100 cm
C) A telescope of diameter 2 cm and focal length 100 cm
D) A telescope of diameter 3 cm and focal length 75 cm
B
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What doesn't a main sequence star collapse under its own gravity?
A. the energy generated by prominences and flares B. the outward force of gas pressure from its interior C. burning of helium to carbon in the core of the main sequence star D. the degeneracy pressure from neutrons resists collapse E. burning of iron in the core of the main sequence star
Two identical arrows, one with twice the speed of the other, are fired into a bale of hay. Compared with penetration of the slow arrow, the faster arrow penetrates
A) the same distance. B) two times as far. C) four times as far. D) more than four times as far. E) none of the above
A 350-g air track cart on a horizontal air track is attached to a string that goes over a frictionless pulley with a moment of inertia of 6.00 × 10-6 kg ? m2 and a radius of 1.35 cm
If the string is pulled vertically downward by a force of 2.50 N, (a) what is the magnitude of the acceleration of the cart, and (b) what is the tension in the horizontal string between the pulley and the cart?
Equal wavelength waves of amplitude 0.25 m and 0.10 m interfere with one another. What is the resulting minimum amplitude that can result?
a. 0.15 m c. 0 m b. 0.10 m d. –0.40 m