An RLC circuit is connected across an AC power source. Which statement is correct?
a. The voltage across the inductor lags the current by 90°.
b. The voltage across the capacitor is in phase with the current
c. At resonance, the phase angle / between the current and the voltage is 0
d. None of the above statements are correct.
c
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Estimate (a) the heat transfer coefficient for a spherical fuel droplet injected into a diesel engine at 80°C and 90 m/s. The oil droplet is 0.025 mm in diameter, the cylinder pressure is 4800 kPa, and the gas temperature is 944 K. (b) Estimate the time required to heat the droplet to its self-ignition temperature of 600°C.
GIVEN
• An oil droplet injected into a diesel engine
• Initial droplet temperature (To) = 80°C
• Injection velocity (Ud) = 90 m/s
• Droplet diameter (D) = 0.025 mm = 2.5 × 10–5 m
• Cylinder pressure = 4800 kPa
• Gas temperature (T?) = 944 K = 671°C FIND (a) The heat transfer coefficient ( h c) (b) The time (t) required for the drop to reach 300°C ASSUMPTIONS
• Radiative heat transfer is negligible
• The gas has the properties of air and behaves as an ideal gas
• Only the density of the gas is affected by pressure
• Variation of the thermal conductivity of the oil with temperature is negligible
• Fuel has the same properties as unused engine oil
SKETCH
If a reaction involving hadrons were written at the quark level as , what is the quark composition of the unknown last particle?
A. udd
B. 
C. uds
D. 
E. More information is needed.
The longer the wavelength of the photon, the ________ the energy it carries
Fill in the blank(s) with correct word
The average radiation dose received from radon in the home is ________
a. less than a dental x-ray dose. b. comparable to that from a nuclear plant c. very dependent upon local geology d. larger in older homes