A small glass bead has been charged to 1.9 nC. What is the strength of the electric field 2.0 cm from the center of the bead? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 4.3 × 104 N/C
B) 8.5 × 102 N/C
C) 8.1 × 10-5 N/C
D) 8.5 × 10-7 N/C
A
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A balloon inflated with helium is able to float toward the ceiling because
A. the balloon and the gas it contains weigh less than the air displaced by the balloon. B. the density of the gas inside the balloon is greater than the density of the atmosphere. C. the pressure of the gas inside the balloon is greater than the atmospheric pressure. D. the pressure of the gas inside the balloon is less than the atmospheric pressure. E. the weight of the balloon is greater than the weight of the air displaced by the balloon.
_____ is a process by which an organism extracts energy from the surroundings, maintains itself, and modifies the surroundings to foster its own survival and reproduction
A) Fission B) Life C) Fossilization D) Mineralization
Diffraction Gratings: When light illuminates a diffraction grating with 7000 lines per centimeter, its second order maximum is at 62.4°. What is the wavelength of the light?
A. 336 nm B. 363 nm C. 633 nm D. 752 nm
A 3.0-kg and a 5.0-kg box rest side-by-side on a smooth, level floor. A horizontal force of 32 N is applied to the 5.0-kg box pushing it against the 3.0-kg box, and, as a result, both boxes slide along the floor
How hard do the two boxes push against each other? A) 12 N B) 20 N C) 24 N D) 32 N E) 0 N