Which of the following has the largest momentum relative to Earth's surface?
A) a tightrope walker crossing Niagara Falls
B) a pickup truck speeding along a highway
C) a Mack truck parked in a parking lot
D) the Science building on campus
E) a mouse running across your room
Answer: B
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A single-shell-sixteen-tube heat exchanger having overall heat transfer conductance of 300 W/m^2?K is used to cool 250 kg/min of ethyl alcohol from 80ºC to 40ºC. Water at 15ºC is used as the coolant and its flow rate is 300 kg/min. Determine the required surface area.
What will be an ideal response?
LR Circuits: A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit and replaced by a wire to complete the circuit. The time constant for of the new circuit represents the time required for the current to decrease to
A. 25% of the original value. B. 37% of the original value. C. 63% of the original value. D. 75% of the original value. E. zero.
What makes carbon dioxide a highly effective greenhouse gas?
a. It easily absorbs UV radiation. b. It easily absorbs visible light. c. It easily absorbs infrared radiation. d. It easily reacts chemically with rock. e. It easily photodissociates in the upper
A sealed container holds 0.020 moles of ideal nitrogen (N2 ) gas, at a pressure of 1.5 atm and a temperature of 290 K. The atomic mass of nitrogen is 14.0 g/mol
How many molecules of nitrogen are in the container? (R = 8.31 J/mol ? K, 1 atm = 101 kPa) A) 1.5 × 1021 mol B) 3.0 × 1021 mol C) 6.0 × 1021 mol D) 1.2 × 1022 mol E) 2.4 × 1022 mol