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, 21.06.2019 20:00
When using two-wire cable to feed a 240-v appliance that does not require a neutral wire, you should a. mark both ends of the white wire green. b. use the cable as is. c. use only the black wire. d. mark both ends and any exposed area of the white wire black.
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Physics, 22.06.2019 06:00
The magnetic field inside a superconducting solenoid is 4.50 t. the solenoid has an inner diameter of 6.20 cm and a length of 26.0 cm. determine (a) the magnetic energy density in the field and (b) the energy stored in the magnetic field within the solenoid.
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Physics, 22.06.2019 12:00
For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up
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