QUESTION 10 A Watt (W) is defined as one Joule (J) of energy per second (s): 1 W = 1 J/s. It is also possible to calculate the watts of an electric device by multiplying the voltage supplied, in Volts (V), by the current drawn, in Amps (A): 1 W = 1 V x 1 A. Consider an electric car with a 75 kWh (kilowatt- hour) battery. If the car consumes on average 230 Wh/mile, what is the maximum range of the car in miles? Enter your answer to one decimal place using rounding.

QUESTION 10 A Watt (W) is defined as one Joule (J) of energy per second (s): 1 W = 1 J/s. It is also possible to calculate the watts of an electric device by multiplying the voltage supplied, in Volts (V), by the current drawn, in Amps (A): 1 W = 1 V x 1 A. Consider an electric car with a 75 kWh (kilowatt- hour) battery. If the car consumes on average 230 Wh/mile, what is the maximum range of the car in miles? Enter your answer to one decimal place using rounding.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.25P

See similar textbooks

Similar questions

1-specific heat of a substance, c, is by definition the heat required to lower the temperature of a unit mass of one degree2- specific heat of a substance, c , is, by definition, the heat required to raise the temperature of a unit mass by one degree3-specific heat of a substance, c, is, by definition, the heat required to raise the temperature of a unit mass by two degrees4-specific heat of a substance, c, is, by definition, the heat required to raise the temperature by three mass units by one degree5- specific heat of a substance, c , is, by definition, the heat required to raise the temperature of two mass units by two degrees choose only one of the above alternatives
29 - Water is drawn from the bottom of a large tank filled with water open to the atmosphere. If the outlet velocity is 7.2 m/s, what could be the height of the water in the tank? a) 2.64m B) 4.38m NS) 3.65 m D) 5.46 m TO) 2.20m 30 - What would be the weight of an object with a mass of 100 kg in a place where the gravitational acceleration is 8 m/s²? a) 42.2 kgf B) 98.1 N NS) 800 N D) 9810 N TO) 196.2 N
Question # 2 A gas of mass (4)kg undergoes a quasi-static expansion which follows a relationship p = a+bv, where ‘a’ and b are constants. The initial and final pressures are (1017) kpa and (217) kpa respectively and corresponding volumes are 0.2meter cubic and 1.2meter cubic. The specific internal energy of the gas is given by u=1.5 pv -85kJ/kg, where ‘p’is in kpa and ‘v’is in m3/kg. Describe the process involved in given system and calculate the net heat transfer and the maximum internal energy of the gas during expansion. (m3 means metercubic).
Question #1 a) The absolute pressure inside a tank is 0.13bar, and the surrounding atmospheric pressure is 98 kPa. A Bourdon gage is mounted in the tank wall to measure the pressure, in kPa? Is this a vacuum or gage reading? b) (967)kJ of heat is transferred from the system to the surroundings when a closed system of mass (28)kg undergoes a process. During the process, 200kJ work is done on the system. If the initial specific internal energy of the system is 300 kJ/kg, Describe the process and determine the final specific internal energy, in kJ/kg? Neglect changes in kinetic and potential energy.
If 15 lbs of water evaporated at atmospheric pressure until a volume of 297 ft^3 is occupied, how much work is done? Select one: a 786.98 Btu b. 807.26 Btu c. 643.09 Btu d. 969.54 Btu
Unreasonable Results - A slightly deranged Arctic inventor surrounded by ice thinks it would be much less mechanically complex to cool a car engine by melting ice on it than by having a water-cooled system with a radiator, water pump, antifreeze, and so on. (a) If 80% of the energy in 1.00 gal of gasoline is converted into “waste heat” in a car engine, how many kilograms of 0C ice could it melt? (b) Is this a reasonable amount of ice to carry around to cool the engine for 1.00 gal of gasoline consumption? (c) What premises or assumptions are unreasonable?
assume SI units, & 1 atm = 105 Pa; ρwater = 1000 kg/m3; ρair = 1.2 kg/m3; g = 9.8 m/s2
the specific heat (cp or cv) can also be understood as a "capacity or ability of a given material to store "heat". In this way, we can say that: 1- the greater the specific heat, the greater the amount of "heat" needed to cause an increase or decrease in temperature per unit mass of the material.2- the higher the specific heat, the lower the amount of "heat" needed to cause an increase or decrease in temperature per unit mass of the material3- the lower the specific heat, the greater the amount of "heat" needed to cause an increase or decrease in temperature per unit mass of the material4- the lower the specific heat, the amount of "heat" needed to cause an increase or decrease in temperature per unit mass of the material does not change5-the higher the specific heat, the amount of "heat" needed to cause an increase or decrease in temperature per unit mass of the material does not change choose only one of the above alternatives as correct
QUESTION FIVE (a) At a certain location, wind is blowing steadily at 10 m/s. Determine the mechanical energy of air per unit mass and the power generation potential of a wind turbine with 60-m-diameter blades at that location. Take the air density to be 1.25 kg/m3. (b) Consider an alcohol and a mercury thermometer that read exactly 0°C at the ice point and 100°C at the steam point. The distance between the two points is divided into 100 equal parts in both thermometers. Do you think these thermometers will give exactly the same reading at a temperature of, say, 60°C? Explain.(c) Determine the work required to deflect a linear spring with a spring constant of 70 kN/m by 20 cm from its rest position.
An engineer living at an elevation of 2500 ft is conducting experiments to verify predictions of glider performance. To process data, density of ambient air is needed. The engineer measures temperature (74.3°F) and atmospheric pressure (27.3 inches of mercury). Calculate density in units of kg /m3 .Compare the calculated value with data from Table A.3 and make a recommendation about the effects of elevation on density; that is, are the effects of elevation significant? show solution.
1. Energy consumption in a country from 2001 to 2011 increased from 1041.3 million to 1526.1 million BOE (barrels of oil equivalent). If the high calorific value (HHV) of the oil is 141,000 kJ/gallon what is the increase in energy consumption over 10 years in Joule units. What is the rate of energy consumption per year? 2. Based on data on the rate of energy consumption per year from question no. 1, if the growth rate energy 2.5% per year, calculate the doubling time (td) and what is the approximate rate of energy growth in 2021.
An electric winch operates on 200 volts [V] and draws 6 amperes [A] of current. The winch has an efficiency of 62%. The winch is used to lift an object that weighs 450 pound-force [lbf] for 12 seconds [s]. Determine the height the object is lifted to, in units of meters [m].