1. The half-life of a certain radioactive material is 1000 years. What fraction of the original amount remains after 1500 years?
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- Material A and material B was exposed to the same change in temperature, but the heat involved with A is 3 times greater than B. If mass of A is 1 kg and mass of B is 10 kg. how do you describe their specific heat ? a. Specific heat of A is 30 times greater compared to B b. Specific heat of A is 10 times greater compared to B d. Specific heat of A is 20 times greater compared to B c. Specific heat of A is 10 times lesser compared to BThe rate of heat lost through insulation varies inversely as the thickness of the insulation. The rate of heat lost through a 3.5-inch thickness of insulation is 2200 Btu per hour. What is the rate of heat lost through a 5-inch thickness of the same insulation?Which of the following thermocouples can measure temperature in a comparatively high range? 1) iron-constantan 2) chromel-alumel 3) platinum-rhodium 4) iridium-rhodium
- A container whose temperature is kept at 200°C is located at 40 ft. above sea level. An object is placed in the said container with a temperature reading of 30°C. After 20 minutes the temperature of the object is 45°C. а. C and k b. General solution Find the temperature of the object after 30 minutes. What is object's temperature 10 minutes before the object reaches the temperature reading of 45°C? с. d.Metals A and B were taken out from a boxed furnaces both at 500 degree Celsius. The ambient temperature, weher the metals were exposed is at 25 degree Celsius. It took 1 minute for Metal A to reach 100 degree Celsius. Determine the temperature of Metal B in degree Celsius, 2 minutes after it was tak out from the furnace to the new ambient temperature. It is known that ka= 2kb.QUESTION 3 A dead body was found within a closed room of a house where the temperature was a constant 66 °F. At the time of discovery, the core temperature of the body wasdetermined to be 88 ° F. One hour later a second measurement showed that the core temperature of the body was 77 ° F. Assume that the time of death corresponds to t = 0 and that the core temperature at that time was 98.6 ° F. Determine how many hours elapsed before the body was found. Type your answer in hours in the space provided below. Round your answer to one decimal place.
- (a) A piece of unknown metal weighs 184 g. When the metal piece absorbs 482.8 J of heat, its temperature increases from 24.5 °C to 40.9 °C. Determine the specific heat of this metal. 160 QUESTION 14 Continuation of the previous problem (b) Taking this same piece of metal, if it starts at 40.9°C, and is now added to a beaker of water at 23.2°C, you find that the temperature of the water eventually reaches thermal equilibrium at T = 24.66°C. How much water was in the beaker when you added the metal?at atmospheric pressure, water melts as the temperature increases from 270K to 280K because a. the chemical potential of the liquid is lower than that of the gas b. the liquid and solid form a eutectic mixture c. the chemical potential of the liquid and solid become equal d. the chemical potential of the liquid is higher than that of the gasWhat is the specific heat of a metal substance if 135 KJ of heat is needed to raise 5.1 kg of the metal from 18 °C to 31.5 °C ? * 2873 J/kg °C O 1961 J/kg °C O 3218 J/kg °c O 2144 J/kg °c
- Determine the total heat transferred to the system in this experiment. (handwritten)A man of weight 600 N is standing on the bottom of a building of height 10 m, the energy possessed by the man is Select one: O 60 Nm 58800 Nm 6000 NmIn a crime scene where a dead body has just been found, Detective John Grisham arrives on the scene at exactly 3:06 PM and begins the investigation. Immediately, the temperature of the body is taken and found to be 80°F. The detective checks the programmable thermostat and finds that the room has been kept at a constant 68°F for the past 3 days. After evidence from the crime scene is collected in an hour, the temperature of the body is taken once more and found to be 78.5°F. Find the temperature (of the body) function T with respect to time t. What time did the victim die?