Concept explainers
The useful life of a machine bearing depends on its operating temperature, as shown by the following data. Plot the data and obtain a functional description of the data. Estimate a bearing’s life if it operates at 150°F.
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System Dynamics
- Which of the following does not correctly represent a dependent and independent relationship? a. Independent variable:Time of day Dependent variable: Outside temperature b. Independent variable:Number of gallons of gas in a car’s tank Dependent variable: Number of miles a car can be c. Independent variable:Number of coins put into a gumball machine Dependent variable: Number of gumballs d. Independent variable: Pace of a runner in a race Dependent variable: Time it takes to complete the racearrow_forwardWhat is the specific weight of air at a temperature of 30 degrees C and absolute pressure of 560 kPa?a. 51.45 N/m3 c. 67.56 N/m3b. 45.35 N/m3 d. 63.17 N/m3 An oil sample wight 38612.16 N and has a volume of 4.8m3. Calculate the specific gravity of the said sample.a. 0.67 c. 0.82b. 0.75 d. 0.68 An 8m3 of air at 28 degrees C and absolute pressure of 176 kPa is compressed to 4m3. What is the resulting pressure assuming isothermal condition?a. 352 kPa abs. c. 345 kPa abs.b. 423 kPa abs. d. 245 kPa abs.arrow_forwardA fixed amount of ideal gas is kept in a container of fixed volume. The absolute pressure P, in pascals, of the gas is plotted as a function of its temperature T, in degrees Celsius. Which of the following are properties of a best fit curve to the data? Select two answers. a. Having a positive slope b. Passing through the origin c. Having zero pressure at a certain negative temperature d. Approaching zero pressure as temperature approaches infinityarrow_forward
- In an experiment designed to determine the value of a parameter n, the actual value that is determined during the experiment is ln n which is determined to be ln n = –1.17828±0.07023. What is the value of n? Make sure that you quote the answer to the correct number of significant figures.arrow_forwardThe following data relate to a performance test of a single acting reciprocating air compressor. Bore = 14 cm Stroke = 10 cm Suction pressure = 1.3 bar Suction temperature = 32°C Discharge pressure = 6 bar Discharge temperature = 180°C Speed of the compressor = 1200 rpm Shaft power = 6.25 kW Mass of air delivered = 1.7 kg/min Polytropic index = 1.25 Calculate the following: (i) Volumetric efficiency (ii) Indicated power (iii) Mechanical efficiencyarrow_forwardIn a dead weight tester experiment, theoretical pressure is 4 bar, error is 0.04997% , then its approximate measured pressure is __________ A. 16 bar B. 1600000 N/m2 C. None of the answers given D. 2 bararrow_forward
- assume SI units, & 1 atm = 105 Pa; ρwater = 1000 kg/m3; ρair = 1.2 kg/m3; g = 9.8 m/s2arrow_forwardYou are abducted by aliens and find yourself locked in a large room on some strange planet. To pass the time, you decide to do some experiments using a ball-and-chain that you find on the floor. You make the following estimates: m(BALL) = 7 kg , m(CHAIN) = 0.5 kg , and l(CHAIN) = 2 m . (a) When you hold the free end of the chain above your head and allow the ball to swing like a pendulum, you use your wristwatch to measure the period as T = 4 s . What is the acceleration due to gravity on this planet?(b) If the ball accidentally hits a wall, how long does it take for this jolt in the chain to travel up to your hand?arrow_forwardAn airplane builder wants to build a scaled-down model of a real airplane in a 12:1 ratio in order to be able to perform tests in a wind tunnel. The real plane flies at 126 km/h, while the air speed in the tunnel where the model is located is given by V. The performances of the two will be equivalent for a value of V, in m/s, equal to Data: air viscosity η = 1.8 × 10-5 kg/(m.s) air density ρ = 1.3 kg/m3arrow_forward
- How is thermal energy lost when a person exits a building through an exterior door in the winter? a) Description of your level of confidence in the variable values. b) The overall level of confidence in the solution and why. Just need answers for these two questions ?arrow_forwardCalculate the pressure due to a column of 0.4 m of the following liquids (a) water (b) an oil of specific gravity 0.9 (c) mercury (d) a liquid of specific weight 46780 N/marrow_forwardTHERMODYNAMICS UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS LEGIBLY. SHOW THE STEP-BY-STEP PROCESS WITH SHORT COMMENT/EXPLANATION. ANSWER IN 3 DECIMAL PLACES. Note: Use values of MW, Cp, Cv, etc., from the Tables provided below.arrow_forward
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