A boy kicks a football with an initial velocity of 20 m/s at an angle of 25° above the horizontal. If we neglect air resistance, the magnitude of the acceleration of the ball while it is in flight is
A) 25 m/s2.
B) 18 m/s2.
C) 9.8 m/s2.
D) 8.5 m/s2.
E) 0 m/s2.
C
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Resolution: A certain astronomical telescope has a diameter of 5.60 m. What is the minimum angle of resolution for this telescope when it is forming images using light of wavelength 620 nm?
A. 1.11 × 10-7 rad B. 3.11 × 10-7 rad C. 2.70 × 10-7 rad D. 1.35 × 10-7 rad E. 4.05 × 10-7 rad
The power rating of a 400-? resistor is 0.800 W. (a) What is the maximum voltage that can be applied across this resistor without damaging it? (b) What is the maximum current this resistor can draw without damaging it?
What will be an ideal response?
A single convex spherical mirror produces an image which is
A) always virtual. B) always imaginary. C) always real. D) real only if the object distance is less than f. E) real only if the object distance is greater than f.
Why do strange particles have long lifetimes compared to other strongly interacting particles?
a. No one knows—this is why they are called "strange.". b. They only decay via the weak interaction. c. They are more massive. d. none of the above