Kepler developed his model of elliptical orbits because of an 8-arcminute discrepancy between observations and a model of planetary motion with circular orbits
Indicate whether the statement is true or false
TRUE
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Latent Heats: Heat is added to a 3.0 kg piece of ice at a rate of 636.0 kW. How long will it take for the ice at 0.0°C to melt? For water LF = 334,000 J/kg and LV = 2.246 × 106 J/kg.
A. 1.6 s B. 640,000 s C. 0.0 s D. 1000 s
Double-Slit Interference: In a two-slit experiment, monochromatic coherent light of wavelength 600 nm passes through a pair of slits separated by 2.20 × 10-5 m. At what angle away from the centerline does the second dark fringe occur?
A. 4.70° B. 3.51° C. 3.94° D. 1.17° E. 2.34°
What is the main energy transformation (input and useful output) for a person speeding up while riding a bicycle?
A) kinetic E ? chemical E B) thermal E ? kinetic E C) chemical E ? elastic E D) elastic E ? kinetic E E) chemical E ? kinetic E
A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 37.0° above the horizontal. The mass of the box and the books is 40.0 kg. (a) Draw the free-body diagram for the box
(b) Calculate the acceleration of the box. (c) Calculate the normal force acting on the box.