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As per the sign convention that we follow in this class, if an electric motor is considered as a control volume then the shaft work for this control volume is positive. Similarly the shaft work for a pump is negative. Thinking on the same lines Answer the following questions.
A) What would be the sign (positive/negative) of the shaft work for a compressor? Give an explanation for your answer.
B) What would be the sign (positive/negative) of the shaft work of a wind turbine? Give an explanation for your answer.
C) Give an example of a device/control volume/system for which the electrical work is positive. Justify your example with an explanation.
D) Give an example of a device/control volume/system for which the electrical work is negative. Justify your example with an explanation.
A 5kg fish swimming 1 m/s swallows and absentmided 1kg fishswimming towards it at a velocity that brings both fish to a haltimmediately after lunch - what is the velocity (v) of the smallerfish before lunch ?
A rod (length = 80 cm) with a rectangular cross section (1.5 mm x 2.0 mm) has a resistance of 0.20 ohms. What is the resistivity of the material used to make the rod
a projectile is fired with an initial velocity of 35 m/s at an angle of 30 degrees above horizontal of a 30 feet tall building. find (a) the max height of the projectile
The human body has a surface area of approximately 1.8 m^2, a surface temperature of approximately 30 degrees celsius, how many photons per second does the body emit
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.0398 s, compute the vertical components of the launch velocity
A copper wire has a square cross section 2.7 on a side. The wire is 3.8 long and carries a current of 4.0 . The density of free electrons is 8.5*10^28 m^-3.
a piano note is compared to a tuning fork vibrating at 440 Hz. Four beats per second are discerned by the piano tuner. What was the initial frequency of the piano wire
Two spheres are launched horizontally from a 1.1m-high table. Sphere A is launched with an initial speed of 4.5 m/s. What is the time for the sphere A to hit the floor
Vectors and lie in an xy plane. has magnitude 8.40 and angle 132° from the positive direction of the x axis. has components Bx = -8.00 and By = -9.20. (Type 'undefined' for any answer if appropriate.)
If a wind begins blowing from the southwest at a speed of 110km/h (average), calculate the velocity (magnitude) of the plane
An engine takes in 8000 cal of heat and exhausts 4000 cal of heat each minute it is running. How much work does the engine perform each minute
Find out the maximum height reached by the rocket.
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