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The primary coil of a transformer has 250 turns and which is surrounded by a flux of 5mWb. When the magnet moves, the flux reduced into 3mWb. If it is connected to a 220-V line, find the time interval during which the flux changes.
An 80kg painter stands on a uniform 25 kg platform board supported by two wooden poles on each side. If each of these two poles can only hold 1000N and they are located at the ends of the 4m platform, will it be safe for him to stand at 1m from one end of the platform?
An iceberg is submerged partially in the sea and remaining 1/3 part is outside the sea level. Use Archimedes' principle to determine the density of an iceberg.
Which part of the Planck radiation formula dominates in the short wavelength range.
If the piston in the hydraulic lift has a cross-sectional area of 0.10m^2, what air pressure must be produced by the compressor to support 20, 000N, the combined weight of car and lift?
1 (a) 1kg of water at a temperature of 20◦C is placed in contact with a cold reservoir held at a constant temperature of 4◦C. (i) What is the change in the internal energy of the water as it cools to 4◦C ? (The specific heat capacity of water is 4148 J K−1 kg−1 .) [1] (ii) Calculate the change in entropy of the water as it cools to 4◦C. [2] (iii)Calculate the change in entropy of the cold reservoir. [2] (iv) Is this process of cooling the water reversible or irreversible? Explain your answer. [1]
v) Assume now that rather than being placed in a direct contact with the cold reservoir the water is cooled from 20◦C to 4◦C by using the water as the heat source for a reversible heat engine. The cold reservoir still has a fixed temperature of 4◦C. How much work can be extracted from this heat engine? [6]
I need help with part (v) only, just including the above parts for context
a coin has fallen from an initial height of 5.0m. determine the coin's velocity when it is above the ground with a complete solution.
consider that we have a circuit with a potential difference of 3.2 volts with a current of 0.6 a ammeter the internal resistance of the battery at 0.5 homes use emf formula
A fan blade rotates with angular velocity given by ωz(t)= γ − β t2, where γ = 5.00 rad/s and β = 0.800 rad/s3.
a- Calculate the angular acceleration as a function of time.
b- Calculate the instantaneous angular acceleration αz at t = 3.00 s and the average angular acceleration aav-z for the time interval t=0 to t0 = 3.00 s.
How do these two quantities compare? If they are different, why are they different?
A fan blade rotates with angular velocity given by wu (t) =Y - Bt2, where Y = 5.00 rad/s and p = 0.800 rad/s3.
(a) Calculate the angular acceleration as a function of time.
(b) Calculate the instantaneous angular acceleration a z at t = 3.00 s and the average angular acceleration a avc for the time interval t = 0 to t = 3.00 s. How do these two quantities compare? If they are different, why are they different?
