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The air inside a hot-air balloon has an average temperature of 73.7oC. The outside air has a temperature of 25.8oC.
What is the ratio of the density of air in the balloon to the density of air in the surrounding atmosphere?
Could somebody include a brief equation summary?
A solar panel measures 0.58 m by 1.1 m. In direct sunlight, the panel delivers 6.4 Amp at 6.1 Volt. compute the efficiency, as a percentage, of the solar panel in converting solar energy into electrical energy
Flux and nonconducting shells. A charged particle is suspended at the center of two concentric spherical shells that are very thin , What is the charge of the central particle
A 45.8-kg girl is standing on a 161-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat surface. What is the velocity of the plank relative to the ice surface
A 6.6 kg bowling ball is lifted 2.4 m into a storage rack. Calculate the increase in the ball's potential energy
q1. a straight 2.60 m rod pivots around a perpendicular axis so that it can swing freely in a horizontal plane. jane
consider a container of 2.0 grams of hydrogen. suppose you remove all of the electrons and moved them to the other side
Given two identical uniform bricks, each of length "L". If stacked in a staggered arrangment at the edge of a table, what maximum overhang can the two bricks have
Monkey first notices a lion attacking when the lion is 12.5 m away and moving toward the monkey at a speed of 5 m/s. How long does the monkeys escape last
A dentist uses a mirror to examine a tooth that is 0.75 cm in front of the mirror. The image of the tooth is formed 11.0 cm behind the mirror. Determine the mirror's radius of curvature
a boat crossing a wide river moves with a speed of 10 kmh relative to water. the water in the river has a uniform speed
Pelicans tuck their wings and free fall straight down when diving for fish. Suppose a pelican starts its dive from a height of 16.0 m and cannot change its path once committed. at what minimum height must it spot the pelican to escape
You are given a 9 V battery and three bulbs rated atrespectively (9V, 5 W), (9V, 2W), and (12 V, 6W). Assume that the battery has negligible internal resistance and that the three bulbsobey Ohm's law and convert energy to light with equaleffecienc..
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