Physics, 25.10.2019 23:43 bradlenz4293
The total consumption of electrical energy in the united states is about 1.0 1019 joules per year.
(a) what is the average rate of electrical energy consumption?
b) the population of the united states is about 300 million people. what is the average rate of electrical energy consumption per person?
c) the sun transfers energy to the earth by radiation at a rate of approximately 1.0 kw per square meter of surface. if this energy could be collected and converted to electrical energy with 85% efficiency, how great an area (in square kilometers) would be required to collect the electrical energy used in the united states?
Answers: 2
Physics, 22.06.2019 02:00
The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s
Answers: 3
Physics, 22.06.2019 23:50
An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?
Answers: 2
Physics, 23.06.2019 00:10
During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.
Answers: 2
The total consumption of electrical energy in the united states is about 1.0 1019 joules per year.
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