1408 Week-9 Lab Homework[1736]

State the rotational version of Newton’s first law. _________________________________________________ _________________________________________________________________________________________ What is the law of conservation of angular momentum? ____________________________________________ _________________________________________________________________________________________ When an ice skater pulls her arms inward, what happens to her rotational speed? _________________________ __________________________________________________________________________________________

It is the responsibility of every physicist to ______________ and _______________ , the do ____________ to ______________ a ____________ or a _______________.

Six examples of physical properties of matter are: B. D.   Physical properties are traits or characteristics of a s_________________     that does n______ involve c___________ change, such as d_________,     c___________, and hardness.   Thermal c_______________ is the ability to transfer t_________, or heat      energy from one area to another.   Plastics and f_______ are styrof________ are p_______ conductors of      t_____________ energy.   On the other hand, m________ make good c________________ of thermal     energy.   D____________ is the ability of a metal to be d________ or pulled into a     wire.   C____________ is often used to make wire because it is very d_________.   States of m___________ are the p__________ forms in which a substance      can exist , such as s________, l_________, g_____, and p_______.   W_____ can exist in three states, s_______ ice, l_________ water, and water     v_________.   Malleability is the ability of a substance to me…

The solar panels are placed in an optimal position such that they receive a solar power of 1186kWh/m^2 per year1. The average solar cell has an efficiency of 20% and an average household in the Netherlands uses 2990kWh of electricity per year. The average solar panel has dimensions of 165x99cm. How many solar panels do you need?

A solar panel receives energy from the Sun at a rate of 5.0 kW. Thermal energy is transferred from the solar panel to water with an efficiency of 20%. Cold water of mass 15 kg enters the solar panel every hour. The specific heat capacity of water is 4200 J / (kg °C). Calculate the temperature increase of the water. temperature increase = ______________________ °C

Nitrogen becomes a liquid at -195.8°C under atmospheric pressure. Oxygen becomes a liquid at -183.0°C. Convert these temperatures to Kelvin. __________________________________________________________ A sealed tank containing a mixture of nitrogen and oxygen is cooled to82.8 K and maintained under atmospheric pressure. Are the contents now a liquid or a gas? Explain. __________________________________________________________ __________________________________________________________

a. If the thermal conductivity of the material through which heat is transferred is increased by a factor of 5, then the rate of heat transfer is ________________ by a factor of _________. b. If the thermal conductivity of the material through which heat is transferred is decreased by a factor of 10, then the rate of heat transfer is ________________ by a factor of _________. c. If the temperature difference on opposite sides of the material through which heat is transferred is increased by a factor of 2, then the rate of heat transfer is ________________ by a factor of _________.

a. If the area through which heat is transferred is increased by a factor of 2, then the rate of heat transfer is ________________ (increased, decreased) by a factor of _________ (number). b. If the thickness of the material through which heat is transferred is increased by a factor of 2, then the rate of heat transfer is ________________ by a factor of _________. c. If the thickness of the material through which heat is transferred is decreased by a factor of 3, then the rate of heat transfer is ________________ by a factor of _________.

The table below gives the results of measuring the electrical conductivity C of glass at temperature T degrees Fahrenheit. 86 148 166 188 202 210 0.004 0.018 0.029 0.051 0.073 0.090 Use regression to find the exponential function C=ae bT that will satisfy the given table. Find the value of Cif T = 197.1.

Heat is added to 1 kg of water such that the temperature increases by 5 K. The specific heat capacity of water is 4, 180 J/(kg.K). The specific heat capacity of iron is 450 J/(kg.K). If the same amount of heat is added to 5 kg of iron, how much will the temperature increase? O 7.28 K O 12.28 K O 10.28 K O 9.28 K

3.5x10^7 J of heat transfers into an engine. If 2.1x10^7 J of work is performed what is the efficiency of the engine? How much heat is lost to the environment?

The quantity of energy Q transferred by heat conduction through an insulating pad in time interval Δt is described by Q/Δt = κAΔT/d, where κ is the thermal conductivity of the material, A is the face area of the pad (perpendicular to the direction of heat flow), ΔT is the difference in temperature across the pad, and d is the thickness of the pad. In one trial to test material as lining for sleeping bags, 86.0 J of heat is transferred through a 3.40-cm-thick pad when the temperature on one side is 37.0°C and on the other side is 2.00°C. In a trial of the same duration with the same temperatures, how much heat will be transferred when more of the material is added to form a pad with the same face area and total thickness 8.41 cm?

As a gasoline engine is running, an amount of gasoline containing 15,200 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,800 J of work. (a) What is the engine's efficiency (in percent)? (b) The burning gasoline has a temperature of about 5,000°F (3,000 K). The waste heat from the engine flows into air at about 86°F (303 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures?

Heat Q, which has the SI unit of joule (J), is the quantity in mechanical engineering that describes the transit of energy from one location to another. The equation for the flow of heat during the time interval At through an insulated wall is KAAT Q = (Тh — T) where k is the thermal conductivity of the material from which the wall is made, A and L are the wall's area and thickness, and Th – T; is the difference (in degrees Celsius) between the high- and low-temperature sides of the wall. By using the principle of dimensional consistency, what is the correct dimension for thermal conductivity in the SI? The lowercase Greek character kappa (K) is a conventional mathematical symbol used for thermal conductivity. Appendix A summarizes the names and symbols of Greek letters. О a. (W-m)/°C O b. °C/(W. m) O c. (m . °C)/W O d. W/(m . °C)

B9

If the heat is assumed to be generated 0.03 m below the skin, the temperature difference between the skin and the interior of the body would exist if the heat were conducted to the surface is 28 k°. What is the heat rate if the surface area of the body is 1.5m? and the coefficient of the thermal conductivity= 0.2watt/m.k°. 290 watt 310 watt 280 watt 260 watt

Following vigorous exercise, the body temperature of a 70.0 kg person is 39.3°C . At what rate in watts must the person transfer thermal energy to reduce the the body temperature to 37.0°C in 40.0 min, assuming the body continues to produce energy at the rate of 150 W?(1 watt = 1 joule/second or 1 W = 1 J/s). Answer _______________________ W (NO scientific notation ONLY Real Number)

The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured.   How many kilocalories per gram are there in a 5.2-g peanut if the energy from burning it is transferred to 0.485 kg of water held in a 0.085-kg aluminum cup, causing a 54.9°C temperature increase? Specific heat of water= 1kcal/Kg degrees C Specific heat aluminum= 0.215kcal/Kg degrees C

Suppose a human body's core internal temperature is 37.0°C, the skin temperature is 34.0°C, the thickness of the tissues between averages 0.85 cm, and the surface area is 1.42 m2.  Calculate the rate of heat conduction, in watts, out of the human body.Numeric   : A numeric value is expected and not an expression.Q/Δt = __________________________________________

Question 1. The table below shows a collection of data for a thermocouple. Temperature is in degrees Celsius, and the Voltage is in millivolts. (a) Plot the graph using rectangular graph paper with Temperature as the independent variable and determine the basic functional relationship between Temperature and Voltage. Alternatively, you can use Microsoft Excel to plot the data, but attach the graph in your answer page. (b) Determine specific the equation, using the method of selected points that best fits the data. Show how you determined the equation. If you need help, review Lecture-5 (c) What is the thermocouple voltage when the temperature is 1225 degree Celsius? Temperature (degree Celsius) Voltage (millivolts) 50 100 150 200 300 400 500 600 700 800 900 1000 2.5 6.7 8.8 11.2 17 22.5 26 32.5 37.7 41 48 55.2

A bulb delivers 33 W of radiant energy when its filament is at 1900 °C . If the temperature increases by 100 °C , what is the new rate of energy radiated by this bulb? O 39.51 W 36.11 W O 27.56 W O 40.52 W

A 2.15-gram cashew nut is burned. The heat released raises the temperature of a 100.0-gram sample of water from 18.2°C to 31.5°C. The mass of the nut after the experiment is 1.78 grams. Determine the calorie content of the nut in Calories/gram. Assume that the water is only able to absorb 25% of the heat released by the burning nut. Given 1.00 Calorie=4.18 kJ.

A hot steel plate with a surface area of 1.52 m2 and a constant surface temperature of 166°C is exposed to ambient air at 22°C. If the convection heat transfer coefficient is 15.9 W/m². K, what is the rate of heat transfer (in W) from the plate to the air [round your final answer to zero decimal places]? T. S Air, T, 00