A rifle is aimed horizontally at the center of a large target 60 m away. The initial speed of the bullet is 240 m/s. What is the distance from the center of the target to the point where the bullet strikes the target?
a. 48 cm
b. 17 cm
c. 31 cm
d. 69 cm
e. 52 cm
c
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Magnifying Glass With the Image at Infinity: What type of lens is used to make a magnifying glass?
A. converging B. diverging C. Either type would work equally well.
Size of the Nucleus: Estimate the mass of a nucleus with radius 2.8 ×10-15 m. (1 u = 1.6605 × 10-27 kg)
A. about 2.1 × 10-26 kg B. about 7.5 × 10-27 kg C. about 2.3 × 10-26 kg D. about 4.7 × 10-26 kg
A projector lens is needed to form an image on a screen 6 times the size of its corresponding object. The screen is located 8.65 m from the lens. What is the required focal length of the lens?
a. 1.44 m b. 7.41 m c. 1.24 m d. 0.721 m e. 1.73 m
After our Sun dies, will it ever undergo a nova explosion? Why or why not?
A) no, because it does not have a close binary companion B) no, because our Sun will become a neutron star, not a white dwarf C) yes, because our Sun will become a white dwarf D) yes, because all stars undergo novae explosions after they die