Some scientists believe that the collision of one or more large asteroids with the Earth was responsible for the extinction of the dinosaurs. The unit of kiloton is used to describe the energy released during large explosions. Itwas originally defined as the explosive capability of 1000 tons of trinitrotoluene (TNT) high explosive. Because that expression can be imprecise depending on the explosive's exact chemical composition, the kilotonsubsequently has been redefined as the equivalent of 4.186 x 1012 J. In the units of kiloton, calculate the kinetic energy of an asteroid that has the size (box-shaped, 13 x 13 x 25 km) and composition (density,2.4 g/cm) of an asteroid. Kinetic energy is defined byU. =mv?where m is the object's mass and v is its speed. Objects passing through the inner solar system generally have speeds in the range of 20 km/s.(Express your answer using two significant figures.)Uk =x1011 kilotons

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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

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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
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.
In the United States, electricity is sold using the SI units of kilowatt (kW) or megawatt (MW), and fuel for power generation stations is generally purchased using English units, e.g., British thermal unit (Btu), gallon (gal), and ton. An industrial power plant has an average annual load of 100 MW (electrical). If the overall thermal efficiency is 33% (based on HHV), what is the annual cost of fuel if the plant is fired with (a) natural gas, (b) No. 2 fuel oil, and (c) bituminous coal? Use the data from Tables 2.2, 2.7, and 2.13. Assume the cost of natural gas is $5/million Btu, the cost of No. 2 fuel oil is $3/gal, and the cost of bituminous coal is $60/ton (1 ton = 2000 lbm)
It is the energy accounted by the molecular motion of the substance due to its, vibrational, rotational, and translational movement. a. Work b. Heat c. Internal Energy d. Chemical Energy
Suppose we have a piece of a candy bar that has an initial mass of 28g. If we ignite the piece of candy bar (literally burn it), and it increases the temperature of 285.23g of water from 18.95°C to 77.43°C, how many calories per gram of energy did the candy bar provide if the final mass of the marshmallow is 4.45? Note: 1.00 cal = 4.184 J. Give your answer in units of cal/g.
We have superheated steam at a pressure of 0.05 bar and temperature of 366.62 oC. What is the specific volume in units of m3/kg? Use the steam tables and report your answer to three decimal places. Note that in the steam tables, the specific volume is reported in units of m3/kg.
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].
In a science lab, students determined how the mass of a cart affects its gravitational potential energy and its kinetic energy as it rolls down a ramp. One of the students held the small cart at the top of the ramp and released it to roll down the ramp. The cart’s mass is 150 g. The students ran the experiment three times. In the second round, they added a mass of 30 g to the cart. In the third round, 50 more grams were added to the weight of the cart for a total of 80 grams of mass added to the cart. The students gathered the data recorded in the table. Describe how the gravitational potential energy and the kinetic energy of the cart change as the cart rolls down the ramp in simple terms
The weight of 1 dozen apples is 5 lb. Determine the average mass of one apple in both SI and US. Units and the average weight of one apple in SI units. In the present case, how applicable is “the rule of the thumb” that an average apple weighs 1 N?
1. What is the weight in pounds-force of an object with a mass of 19 lbm on a planet where g = 12 ft/s2? 2. If a gas has γ = 14 N/m3, what is its density? State your answers in SI units.
Exhaust gas leaves the exhaust pipe of a motor car with a pressure of 1.2 bar and a temperature of 4000C. If the exhaust gas specific was 1.6653 m3 per kg, determine the identity of the exhaust gas. please show the formula used and cancellation of units, if possible include illustration also.
What is the specific weight of five liters of liquid weighing 50 N?what is the density of the liquid? what is the specific gravity of the liquid?

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