You put a thermometer in a pot of hot water and record the reading. What temperature have you recorded? (i) The temperature of the water; (ii) the temperature of the thermometer; (iii) an equal average of the temperatures of the water and thermometer; (iv) a weighted average of the temperatures of the water and thermometer, with more emphasis on the temperature of the water; (v) a weighted average of the water and thermometer, with more emphasis on the temperature of the thermometer.
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- Convert the following to equivalent temperatures on the Celsius and Kelvin scales: (a) the normal human body temperature, 98.6F; (b) the air temperature on a cold day, 5.00F.arrow_forwarda) A thermometer is removed from a room where the temperature is 70° F and is taken outside, where the air temperature is 40° F. After one-half minute the thermometer reads 60° F. What is the reading of the thermometer at t = 1 min? (Round your answer to two decimal places.)___ ° F b) How long will it take for the thermometer to reach 45° F? (Round your answer to two decimal places.)___ minarrow_forwardA picture window has dimensions of 1.25 m by 2.6 m and is made of glass 7.5 mm thick. On a winter day, the outside temperature is 22° C while the inside temperature is a comfortable at 19° C. (k of glass =0.075W/m.K) Calculate the following:a) the area of the window in square metresarrow_forward
- A roast turkey is taken from an oven when its temperature has reached 185°F and is placed on a table in a room where the temperature is 75°F. (Round your answers to the nearest whole number.) (a) If the temperature of the turkey is 150°F after half an hour, what is the temperature after 50 minutes? T(50) = °F (b) When will the turkey have cooled to 100°? t = minarrow_forwardBob heats up a bottle of milk for his baby, Jill, every morning. Jill will only drink the bottle if it is at 98 degrees. So Bob places the bottle in a cup of hot water (170 degrees). The bottle starts off at 35 degrees. After 2 minutes the bottle is 80 degrees. Use Newton's heating-cooling law, that the rate of change in the temperature, H, is proportional to the difference between the object and the surrounding temperature, to determine how long Bob should leave the bottle in the hot water. Assume that the water stays at 170 degrees.arrow_forwardThe temperature of a cup of coffee t min after it is poured is given by the following equation where T is measured in degrees Fahrenheit. T=80 +90 e^(-0.055 t) a) What was the temperature of the coffee when it was poured? ___________________ F b) When will the coffee be cool enough to drink (say, 120 degrees F)? (Round your answer to one decimal place.) _________________ minarrow_forward
- According to the Delaware River Port Authority, the total length of the Walt Whitman Bridge is nominally 11,982 feet. Assuming that the bridge was made entirely of steel, by how many meters does the bridge’s length change as its temperature rises from a winter temperature of 5°F to a summer temperature of 105 °F? Length change = _________meters. Be sure to first convert all lengths and temperatures to S.I. unitsarrow_forwardAccording to the National Coffee Association, the best serving temperature of coffee is between 82°C to 88°C. One day you decided to take a coffee break at Falcon Garden and it was served with a temperature of 87°C and after 5 minutes you found out that the temperature of the coffee was decrease to 73°C. If the temperature at Falcon Garden is 20°C what is the temperature of your coffee after 18 minutes. (unit not needed)arrow_forwardYou stand on top of a skyscraper and drop a rubber ball from a height of 163 m. As the ball bounces off the floor it converts some of its energy into thermal energy -- it becomes warmer. Eventually, it stops bouncing and it has converted all the energy it initially had into thermal energy. How much has its temperature risen? (The specific heat of rubber is 2005 J/(kg*K).)arrow_forward
- The following heat transfer formula quantifies the radiation emitted from the Sun: P = eoA(T4 – T?) Equation 5 where: P= radiated power (Watts) e = emissivity (=1 for ideal radiator; unitless) o = Stefan-Boltzmann constant = 5.67x10-8 W/m2-K+ A = radiating area (m²) T= temperature of radiator (Kelvin) Tc = temperature of surroundings (Kelvin) Q3 Using the following values, together with equation 5, calculate the power emitted by the Sun. sun's surface temperature = 5780 K temperature of the environment that the Sun is located in = 4 K emissivity of the Sun = 1 radius of the Sun = 695,700,000 m Stephen-Boltzmann constant o = 5.67 x 10-8 W/m2-K4 Show your work below-you may use the equation editor or insert a picture of your handwritten work.arrow_forwardA body at a temperature of 50° F is placed in an oven whose temperature is kept at 150° F. If after 10 minutes the temperature of the body is 75° F, find the time (min) required for the body to attain a temperature that is within a half degree of the oven temperature. 2 decimal places(no units)arrow_forwardQ1. a) Choose which quantity/unit is fundamental, or derived quantity/unit by ticking (√ ). Sl No Quantity Fundamental Quantity Derived Quantity Fundamental Unit Derived Unit Example m/s √ 1 volume 2 J/kg 3 viscosity 4 N/m 5 Surface tension 6 Angular velocity 7 s-2 8 Heat flux density 9 V/m 10 Thermal conductivityarrow_forward
- University Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice UniversityPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning