What is meant by NTU?
What will be an ideal response?
The NTU is an abbreviation for Number of Thermal Units, and is a dimensionless
parameter which is the ratio of the overall conductance/heat exchanger surface
to the minimum fluid flow rate/specific heat product. It is sometimes
abbreviated further as just N, and is an analytic approach to quantifying the
heat exchanger effectiveness.
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Indicate whether the statement is true or false
In coming to the conclusion that lightbeams are bent by gravity, Einstein reasoned that
A) increased mass at higher velocities causes increased gravitational effects, so lightbeams moving at lightspeed should have gravitational effects. B) since all observers experience the same laws of physics, Newton's theory of gravity must apply to lightbeams. C) since lightspeed is the same for all observers, moving observers would observe that lightbeams bend. D) fast-moving observers would find that lightbeams bend, so gravity must also bend lightbeams. E) accelerated observers would find that lightbeams bend, so gravity must also bend lightbeams.
What is the angular separation of two spectral lines of wavelengths 497 nm and 251 nm formed in the third order with a grating having 587 lines per millimeter?
A) 34.8° B) 24.8° C) 41.3° D) 29.4° E) 4.21°
Two charges lie on the x axis, +3q at the origin, and -2q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is
a. 1.0 m. b. 2.0 m. c. 2.5 m. d. 3.0 m. e. 4.0 m.