Which of the above images represents a solution of the strongest acid (HA)?
A) A
B) B
C) C
D) All of the above are strong acids.
E) None of the above are strong acids.
Answer: C
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Nitrogen at 30°C and atmospheric pressure enter a triangular duct 0.02 m on each side at a rate of 4 × 10–4 kg/s. If the duct temperature is uniform at 200°C, estimate the bulk temperature of the nitrogen 2 m and 5 m from the inlet.
GIVEN
• Atmospheric nitrogen flowing through a triangular duct
• Bulk inlet temperature (Tb,in) = 30°C
• Width of each side of the duct (w) = 0.02 m
• Mass flow rate (m ) = 4 × 1–4 kg/s
• Duct temperature (Ts) = 200°C (uniform)
FIND
• The bulk temperature
(a) 2 m from the inlet and,
(b) 5 m from the inlet
SKETCH
The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc
Indicate whether the statement is true or false
The hypernova model of the collapse of the core of a massive star may describe
A. the gravitational collapse of a protostar prior to the main sequence phase B. the feeding of material into a quasar C. a neutron star D. a relatively long gamma ray burst E. a black hole
A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of rotation. What is the acceleration of that point due to the spin of the wheel?
A) 0.050 m/s2 B) 1.4 m/s2 C) 48 m/s2 D) 200 m/s2 E) 0.00 m/s2