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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 77.0 days? (b) How much time (in s) does the pulsar take to rotate 5.00 × 106 times and (c) what is the associated uncertainty, in s?
What must the banking angle of the curves be so that the force of the pavement on the tires of the car is in the normal direction.
Old MacDonald had a farm, and on that farm he had a gate (see below). The gate is 3m wide and 1.8m high, with hinges attached to the top and bottom. The guy wire makes an angle of 300 with the top of the gate and is tightened by a turn buckle to a..
Determine the magnitude of the force experienced.
An airplane is flying with a velocity of 86.0 at an angle of 23.0 above the horizontal. When the plane is a distance 114 straight above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
A cube of ice is taken from the freezer at -8.7°C and placed in a 97 g aluminium calorimeter filled with 351 g of water at the room temperature of 20°C. The final situation is observed to be all water at 19°C. What was the mass of an ice cube.
The fuel gage for a gasoline tank in the car reads proportional to the bottom gage pressure .if the tank is 30cm deep and accidentally contains 2 com of water plus gasoline how many centimetres of air remain at the top when gage erroneously reads ..
Light of wavelength 470 nm in air enters a fishbowl filled with water, then exits by the crown-glass wall of the container. Find the wavelengths of the light (a) in the water and (b) in the glass.
What is the magnitude of the magnitic filed.
A loudspeaker is placed between two observers who are 120 m apart, along line connecting them. If one observer records a sound level of 52.8 dB and the other records a sound level of 83.5 dB, how far is the speaker from each observer? Enter the longe..
What is effectiveness of battery as an energy storage device
define the magnitude of the initial velocity. use 9.81 m/s^2 for the acceleration due to gravity on earth.
find out the current in the loop.Determine the rate at which thermal energy is produced.
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