Physics, 19.01.2021 19:10 21hendlill
In a relay race, each contestant runs a distance 26.0 m while carrying an egg balanced on a spoon, turns around, and comes back to the starting point. Edith runs the first distance 26.0 m in a time t1 = 20.7 s . On the return trip she is more confident and takes only time t2 = 14.8 s .
a. What is the magnitude of her average velocity for the first distance 25.3 m ?
b. What is the magnitude of her average velocity for the return trip?
c. What is her average velocity for the entire round trip?
d. What is her average speed for the round trip?
Answers: 1
Physics, 21.06.2019 18:20
The extremely high temperatures needed to trigger nuclear fusion are proposed to be generated by laser irradiating a spherical pellet of deuterium and tritium fuel of diameter 1.8 mm. (a) determine the maximum fuel temperature that can be achieved by irradiating the pellet with 200 lasers, each producing a power of 550 w. the pellet has an absorptivity 0.3 and emissivity 0.8.
Answers: 2
Physics, 22.06.2019 02:30
The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.
Answers: 1
Physics, 22.06.2019 03:50
The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle ΞΈ=0β with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle ΞΈ=30β with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle ΞΈ=45β with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle ΞΈ=60β with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle ΞΈ=90β with the plane of polarization?
Answers: 1
Physics, 22.06.2019 07:10
Road users moving into your lane, brake lights, and abrupt changes in road surface are a. rare at night b. indicators of potential hazards c. not worth worrying about before you reach them d. no problem for experienced drivers
Answers: 1
In a relay race, each contestant runs a distance 26.0 m while carrying an egg balanced on a spoon, t...
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