A 0.20-kg block rests on a frictionless, level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. A frictional force of 0.3 N exists between the block and surface. What is the speed of the block when it passes through the equilibrium
point after being released from the 4.0-cm displacement point?
a. 0.45 m/s
c. 0.72 m/s
b. 0.63 m/s
d. 1.2 m/s
C
You might also like to view...
Buoyancy: A spherical ball of lead (density 11.3 g/cm3) is placed in a tub of mercury (density 13.6 g/cm3). Which answer best describes the result?
A. The lead ball will float with about 83% of its volume above the surface of the mercury. B. The lead ball will float with its top exactly even with the surface of the mercury. C. The lead ball will float with about 17% of its volume above the surface of the mercury. D. The lead will sink to the bottom of the mercury.
How have astronomers discovered planets orbiting a star beyond the Sun?
A. They can see the planet brighten as it passes in front of its parent star. B. They have bounced radar off them. C. They can be detected by the slight gravitational tug that they exert on their parent stars. D. So far, no planets have been discovered around any other stars.
Why do astronomers narrow their search to the "habitable zone" of other star systems?
a. the most likely place to support planets with thick atmospheres b. the least likely place to have zero ultraviolet radiation c. the most likely place with liquid water, and extraterrestrial life d. the most likely place to have oxygen in the atmosphere e. the least likely place to have wide temperature ranges on the surfaces of planets
Thin Films: Two very flat glass plates, 16 cm long, are in contact at one end and separated by 0.020 mm at the other end. The space between the plates is occupied by oil with index of refraction 1.45. The refractive index of the glass plates is 1.55. The plates are illuminated at normal incidence with monochromatic light, and fringes are observed. When the monochromatic light has a wavelength of 580 nm, how many bright fringes are visible in the pattern?
A. 60 B. 70 C. 80 D. 90 E. 100