A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 25 radians per seconds, then the tangential velocity of a point on the circumference is
A. 1.0 m/s.
B. 1.5 m/s.
C. 2.0 m/s.
D. 2.5 m/s.
E. 3.0 m/s.
B. 1.5 m/s.
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A single-shell-eight-tube-pass heat exchanger is used in a power plant to preheat 55ºF water to 80ºF by using 190ºF hot water and cooling it to 160ºF. If the overall heat exchanger conductance is 400 Btu/hr?ft^2 ?0F and if 1800 lbm/min of 55ºF water is preheated, determine (a) mass flow of the hot water and (b) surface area of the heat exchanger.
What will be an ideal response?
The speed of waves in stretched string depends on which of the following?
A. the tension in the string B. the amplitude of the waves C. the wavelength of the waves D. the frequency of the waves
The spreading of different wavelengths of light due to slightly different indices of refraction is known as
A. Refraction B. Dispersion C. Immersion D. Total internal reflection
A projectile is fired into the air at an angle of 50° above ground level and hits a target downrange. It will also hit the target if fired at an angle of
A) 40°. B) 45°. C) 55°. D) 60°. E) none of the above