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A superheater brings 2.5 kg/s saturated water vapor at 2 MPa to 450oC. The energy is provided by hot air at 1200 K flowing outside the steam tube in the opposite direction as the water, which is a counter flowing heat exchanger. Find the smallest possible mass flow rate of the air so the air exit temperature is 20oC larger than the incoming water temperature (so it can heat it).
Two circular disks spaced 0.50 mm apart from a parallel-plate capacitor. What are the diameters of the disks
At time t=0 a grinding wheel has an angular velocity of 27.0rad/s, At what time does the wheel stop
A tuning fork of unknown frequency is noted to be higher than one marked 512 hz and lower than one marked 1000 hz. You discover resonance points at .11 m and .53 m. Using 347 m/s for speed of sound what is the frequency of the new fork.
A helicopter lifts a 75 kilogram astronaut 12 meter vertically from the ocean by means of a cable. The acceleration of the astronaut is g/13. Find how much work is done on the astronaut by the force from the helicopter
If a lab student determines the coeffient of linear expansion of aluminum is 26.4 x 10-6, what is that student's percent error for the experiment
A child wishes to determine the speed a slingshot imparts to a rock, how can this be done using only a meter stick, a rock, and the slingshot?
a cylindrical tank is 50.0 ft deep 31.0 ft in diameter and filled to the top with water. a flashlight shines into the
a skateboarder starting from rest rolls down a 13.0 m ramp. when she arrives at the bottom of the ramp her speed is
A projectile is fired at an angle of 45° with initial kinetic energy E0. At the top of its trajectory, What is the speed of the first fragment
Metal sphere 1 has a positive charge of 7.00nC . Metal sphere 2, which is twice the diameter of sphere 1, is initially uncharged. What are the final charges on each sphere.
A disk of mass M and radius R rolls back and forth on avertical track of radius a. Obtain the equation of motion
Two protons are released from rest, one from location 1 and another from location 2. When these two protons reach location 3, what is the electric potential at location 3
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