Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Chapter 25, Problem 4Q
To determine
The reason for which the ambient temperature cannot be taken as zero degrees. The reason for which the resistance is written as
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The resistance RT of a platinum varies with temperature T (0C), as measured on the constant-volume gas thermometer according to the equation RT = R0(1+AT+BT2). Where A=3.8 × 10-3 0C-1 and B= -5.6×10-7 0C-2. Calculate the temperature that would be indicated on a platinum thermometer, when the gas scale reads 2000C.
The resistance of a cylindirical wire is measured as R = 2002 at 24°C. At what temperature will the resistance be increased by 15%, assuming that the length and the cross-sectional area does not change. (Give your
answer without units)
( The temperature coefficient a = 0.03(°C)-1)
Answer:
The resistance of the platinum wire of a platinum resistance thermometer at the ice point is 5 Ω and at steam point is 5.39 Ω. When the thermometer is inserted in a hot bath, the resistance of the platinum wire is 5.795 Ω. Calculate the temperature of the bath.
Chapter 25 Solutions
Physics Laboratory Experiments
Ch. 25 - Prob. 1ASACh. 25 - Prob. 2ASACh. 25 - Distinguish between a positive and a negative...Ch. 25 - Are the of a metal conductor and the of a...Ch. 25 - What are the circuit conditions when a Wheatstone...Ch. 25 - Prob. 6ASACh. 25 - What is the value of for copper in terms of...Ch. 25 - Prob. 3QCh. 25 - Prob. 4QCh. 25 - Prob. 5Q
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- A two-dimensional conduction resistance and heat rate may be expressed as 1 Rt = and q = SAT₁-2 respectively. Sk No O yesarrow_forwardConsider the circuit shown below. (Due to the nature of this problem, do not use rounded intermediate values in your calculations-including answers submitted in WebAssign.) R₁ =70 467 137 V. 13 V R₂ 30 www 1/2 www R₁-20 www 13 R₂ = 20 (b) Find the power supplied by the voltage sources (in W). W (c) Find the power dissipated by the resistors (in W). W V₂ = 5V Tis (0) Find 1₁₂ and 75 (all in A). (Indicate the direction with the signs of your answers.) 45 12- wwwarrow_forwardThe resistance of the platinum wire of a platinum resistance thermometer at the ice point is 5 2 and at steam point is 5.39 Q. When the thermometer is inserted in a hot bath, the resistance of the platinum wire is 5.795 Q. Calculate the temperature of the bath.arrow_forward
- A heater is placed in 5 liters of ethanol, which has a specific heat capacity of 2.44 joules per gram kelvin and a specific gravity of 0.7893. Assume the initial temperature of the ethanol is 70 degrees Fahrenheit, the heater is powered by a voltage of 240 volts at a current of 500 milliamperes, and the transfer of energy to the ethanol as heat has an efficiency of 45%. How long must the heater operate to raise the temperature of the ethanol to 95 degrees Fahrenheit? Express your answer in units of minutes.arrow_forwardA rectangular bar of iron is 2.0 cm by 2.0 cm in cross-section and 40 cm long. Calculate its resistance if the resitivity of iron is 11 x 10*Qm.arrow_forwardIn one form of plethysmograph (a device for measuring volume), a rubber capillary tube with an inside diameter of 1.41 mm is filled with mercury at 20°C. The resistance of the mercury is measured with the aid of electrodes sealed into the ends of the tube. If 100.00 cm of the tube is wound in a spiral around a patient's upper arm, the blood flow during a heartbeat causes the arm to expand, stretching the tube to a length of 100.08 cm. From this observation, and assuming cylindrical symmetry, you can find the change in volume of the arm, which gives an indication of blood flow. Take PHg = 9.4 x 10-7. m. (a) Calculate the resistance of the mercury. Ω (b) Calculate the fractional change in resistance during the heartbeat. Hint: Because the cylindrical volume is constant, V = A;L; = AƒLƒ and Aƒ = A;(L;/Lf). % increasearrow_forward
- In one form of plethysmograph (a device for measuring volume), a rubber capillary tube with an inside diameter of 1.30 mm is filled with mercury at 20°C. The resistance of the mercury is measured with the aid of electrodes sealed into the ends of the tube. If 100.00 cm of the tube is wound in a spiral around a patient's upper arm, the blood flow during a heartbeat causes the arm to expand, stretching the tube to a length of 100.20 cm. From this observation, and assuming cylindrical symmetry, you can find the change in volume of the arm, which gives an indication of blood flow. Take ?Hg = 9.4 ✕ 10−7 Ω · m. (a) Calculate the resistance of the mercury. (b) Calculate the fractional change in resistance during the heartbeat. Hint: Because the cylindrical volume is constant, V = Ai Li = Af Lf and Af = Ai(Li/Lf).arrow_forwardQuestion 3: A platinum resistance thermometer is a device that allows us to determine the temperature by measuring the resistance of a piece of pure platinum wire. In the interval between the freezing point of water and 700.0°C, the relationship between the resistance and the Celsius temperature Tc is accurately captured by the formula R = Ro (1 + A Tc + B (Tc)²) where A and B are constants determined by measurements at the ice point of water, the steam point of water, and the melting point of zinc (419.514°C). (a) If R equals 10.000 ohms at the freezing point of water, 13.946 ohms at the boiling point of water, and 24.174 ohms at the melting point of zinc, find RO, A, and B (b) If the resistance is measured to be 17.7 ohms, what is the temperature? (c) Plot R versus Tc in the range from 0°C to 700.0°C. Math tip: When we have several equations for several unknown variables, we can use the first equation to solve for one of the variables in terms of the others and then replace that…arrow_forwardIn one form of plethysmograph (a device for measuring volume), a rubber capillary tube with an inside diameter of 1.00 mm is filled with mercury at 20°C. The resistance of the mercury is measured with the aid of electrodes sealed into the ends of the tube. If 100.00 cm of the tube is wound in a spiral around a patient’s upper arm, the blood flow during a heartbeat causes the arm to expand, stretching the tube to a length of 100.04 cm. From this observation, and assuming cylindrical symmetry, you can find the change in volume of the arm, which gives an indication of blood flow. (a) Calculate the resistance of the mercury. (b) Calculate the fractional change in resistance during the heartbeat. Take ρHg = 9.4 × 10−7 Ω m. Hint: Because the cylindrical volume is constant, V = AiLi = and Af = Ai(Li/Lf )arrow_forward
- Digital thermometers often make use of thermistors, a type of resistor with resistance that varies with temperature more than standar resistors. Find the temperature coefficient of resistivity (in (°C)-1) for a linear thermistor with resistances of 56.2 Q at 0.00°C and 274 at 522°C. HINT Lan 1arrow_forwardA 13-V storage battery delivers current at the rate of 59 A. In a 25 min period, the heat lost from the battery is 98.61 kJ. What is the change in internal energy in kJ of the battery for the discharging period? Answer in 3 decimal places.arrow_forwardUsing the drain characteristic of Fig. a. What is the value of ra for VGs = -1 V? b. What is the value of gm0 at Vps = 10 V? I, (mA) 10- VGs=0 V -1 V -2 V 2 -3 V -4 V 1 2 3 4 6. 7 9 10 11 12 13 14 15 16 17 18 19 20 Vps (V)arrow_forward
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