Physics, 28.09.2019 18:30 xelynncaldera
Time standards are now based on atomic clocks. a promising second standard is based on pulsars, which are rotating neutron stars (highly compact stars consisting only of neutrons). some rotate at a rate that is highly stable, sending out a radio beacon that sweeps briefly across earth once with each rotation, like a lighthouse beacon. pulsar psr 1937+21 is an example; it rotates once every 1.55780644887275 ± 3 ms, where the trailing ±3 indicates the uncertainty in the last decimal place (it does not mean ±3 ms). (a) how many times does psr 1937+21 rotate in 39.0 days? (b) how much time does the pulsar take to rotate 3.00 × 106 times and (c) what is the associated uncertainty?
Answers: 1
Physics, 22.06.2019 13:00
Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg
Answers: 1
Physics, 22.06.2019 21:00
On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?
Answers: 3
Physics, 22.06.2019 22:00
On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2.
Answers: 2
Physics, 23.06.2019 01:30
The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656(red) and 486 (blue). light from a hydrogen lamp illuminates a diffraction grating with 500 lines per mm, and the light is observed on a screen 1.50 behind the grating. what is the distance between the first-order red and blue fringes?
Answers: 3
Time standards are now based on atomic clocks. a promising second standard is based on pulsars, whic...
Computers and Technology, 12.12.2019 02:31
Physics, 12.12.2019 02:31