A myopic girl wears eyeglasses that allow her to have clear distant vision. The power of the lenses of her eyeglasses is -3.00 diopters. Without eyeglasses, the far point of the girl is closest to:
A) 0.33 m
B) 0.25 m
C) 0.17 m
D) 0.42 m
E) 0.50 m
A
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A helium-filled weather balloon has a 0.50-m radius at liftoff where air pressure is 1.00 atm and the temperature is 290 K. When airborne, the temperature is 200 K, and its radius expands to 2.00 m. What is the pressure at the airborne location?
a. 0.0227 atm b. 0.172 atm c. 0.0108 atm d. 44.1 atm
An object moves with a constant speed of 30 m/s on a circular track of radius 150 m. What is the acceleration of the object?
A) 0 m/s2 B) 0.17 m/s2 C) 5.0 m/s2 D) 6.0 m/s2
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 2.0 cm from the center of the two surfaces?
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An ideal fluid, of density 850 kg/m3, flows at 0.560 kg/s through a pipe of radius 0.0250 m. What is the fluid speed?
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