Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
a. each body exerts an equal and opposite force on the other during the collision.
b. the forces act during equal time intervals.
c. the law of conservation of momentum for an isolated system is a vector equation.
d. of all of the above.
e. of only (a) and (b) above.
d
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The position of a mass that is oscillating on a spring is given by x = (17.4 cm) cos[(5.46 s-1)t]. What is the period of this motion?
A) 1.74 s B) 1.15 s C) 1.32 s D) 0.869 s E) 0.314 s
Hydrogen lines are strongest in class A stars
Indicate whether the statement is true or false
The __________ of the sun is not visible during a total solar eclipse
Fill in the blank(s) with correct word
A counterflow regenerator is used in a gas turbine power plant to preheat the air before it enters the combustor. The air leaves the compressor at a temperature of 350°C. Exhaust gas leaves the turbine at 700°C. The mass flow rates of air and gas are 5 kg/s. Take the cp of air and gas to be equal to 1.05 kJ/(kg K). Determine the required heat transfer area as a function of the regenerator effectiveness, if the overall heat transfer coefficient is 75 W/(m2 K).
GIVEN
• Counterflow air-to-gas heat exchanger
• Entering temperatures
? Ta,in = 350°C
? Tg,in = 700°C
• Mass flow rates: m a= 5 kg/s
• Specific heats: cpa = cpg = 1.05 kJ/(kg K) = 1050 J/(kg K)
• Overall heat transfer coefficient (U) = 75 W/(m2 K)
FIND
• The heat transfer area (A) as a function of the effectiveness (e)
SKETCH
