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Some clocks that are powered by an AC voltage use the AC frequencyto keep time. The power company makes this possible by arranging to have precisely the correct number of cycles occur every day, whichkeeps such clocks from gaining or losing time over long periods.
a) How many cycles of AC voltage are there each week in the United States?
b) Suppose a clock designed for the United States (where the ACfrequency is 60 Hz) is taken to a different country where thefrequency is 55 Hz. After one fullweek at its new location, this clockwill be in error by an amount Δt. FindΔt.
Commercial aircraft fly near 200mb where the outside temperate is -60 degrees Celsius. Calculate the temperature of the air if compressed adiabatically to the cabin pressure of 1000mb.
A car (mass = 1100 kg)is traveling at 32 m/s when it collides head on with asport utility vehicle (mass =2500 kg) traveling in the opposite direction. In the collision, the two vehicles come to a halt. At what speed was the sport utility vehicle ..
a top view of a bar that can slide on two frictionless rails. The resistor is R = 6.20 ?,and a 2.50-T magnetic field is directed perpendicularly downward, At what rate is energy delivered to the resistor
A moving particle encounters an external electric field that decreases its kinetic energy from 9520 eV to 7060 eV as the particle moves from position A to position B. the electric potential at A is -55.0V and the electric potential at B is +27.0V.
A particle is located at r=(4.1i+3.1j+5.6k)m . A force F=(9.5j-3.5k)N acts on it. What is the torque, calculated about the origin
A person walks first at a constant speed of 4.80 m/s along a straight line from point a to point b, What is her average speed over the entire trip
a skier of mass 100 kg, starts from rest as the top of a frictionless incline of height 20 m, how far does she travel on the horizontal surface before coming to rest
In a single-slit experiment, light of wavelength 500 nm is used to produce a diffraction pattern on a screen 4.0 m away. what is the slit width
On a perfect fall day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward nor downward. What is the weight of the displaced air
In an insulated vessel, 260 g of ice at0°C is added to 630 g of water at19.0°C. What is the final temperature of the system? How much ice remains when the system reaches equilibrium?
If a force vector has a magnitude of 2.61 newtons and points 64.5 degrees south of east, then what is its x-component?
A flat sheet of ice (n = 1.309) has a thickness of 2.2 cm. It is on top of a flat sheet of crystalline quartz (n = 1.544) that has a thickness of 1.6 cm. how far (in cm) would it have traveled in a vacuum
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