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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 65.0 days?
(b) How much time does the pulsar take to rotate 1.00 × 106 times and
(c) what is the associated uncertainty?
A certain ohmic resistor has a resistance of 45 ohms. A second resistor is made of the same material but is two times as long, What is the effective resistance of the two resistors in series
Expalin by how much does the potential energy of a 18.0-kg child increase when the child climbs a normal staircase to the second floor?
A 1.2m -long, 900g rope pulls a 9.0kg block of ice across a horizontal, frictionless surface. The block accelerates at 1.0m/s^2, How much force pulls forward on the block of ice
A galvanometer with a coil resistance of 14.1 is used with a shunt resistor to make a nondigital ammeter that has an equivalent resistance of 0.755. determine the full-scale current of the galvanometer
Radius=10m Vt=12.3 If at point A the track exerts a force on the car that is 2.92 × 10^4 N greater than the car's weight, what is the mass of the car.
(a) Calculate the ratio of the electric potential at the surface of the large sphere to that of the small sphere. (b) Calculate the ratio of the magnitudes of the electric fields at the surface of the large sphere to that of the small sphere.
A 65-? loudspeaker, a 8.0-? loudspeaker, and a 2.1-? loudspeaker are connected in parallel across the terminals of an amplifier. Determine the equivalent resistance of the three speakers
As it enters a pipe, a perfect fluid has spped 3.70 m/s. As it exits the pipe, the speed is 10.6 m/s. what is the radius of the pipe at the exit
A refrigerator uses an ideal Carnot cycle to cool its interior. The outside air has a temperature of 302 K and the refrigerator is kept at a temperature of 276 K. find the coefficient of performance of this refrigerator
An airtight box has a removable lid of area 1.00 10-2 m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 7.00 104 Pa. The inside of the box is completely displaced. What is the magnitude of the force es..
A gas mixture contains 2.50 mol of O2 and 3.00 mol of Ar. What is the molar specific heat at constant pressure for this mixture
A generator rotates at 95Hz in a magnetic field of 0.025T . It has 650 turns and produces an rms voltage of 180V, What is the area of each turn of the coil
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