Wednesday
September 17, 2014

Posts by Christ


Total # Posts: 25

phy
1 Physical quantities such as length, mass, time and temperature are referred to as vector quantities fundamental quantities scalar quantities derived quantities 2 The following are examples of vector quantities except displacment velocity accleration speed 3 The addition of ...
January 28, 2013

phy
1 What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) Rg(R−h) R2g(R−h)2 2 The instrument used for experimental determination of the value of the universal gravitational constant G is ...
January 28, 2013

phy
A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true? The passenger is in motion relative to the passer-by The passer-by is stationary relative to the passenger Both ...
January 28, 2013

phy
1 An object is thrown upward from the edge of a tall building with a velocity of 10 m/s. Where will the object be 3 s after it is thrown? Take g=10ms−2 15 m above the top of the building 30 m below the top of the building 15 m below the top of the building 30 m above the...
January 28, 2013

phy
A piece of plastic barely floats in water. If it has a mass of 20g, what is its volume?
January 24, 2013

phy
At what temperature will the root-mean-square speed of oxygen molecules have the value of 640 m/s? 1 kilomole of oxygen has a mass of 32kg.
January 24, 2013

phy
Calculate the average translational kinetic energy of a nitrogen molecule at 27 degree celcius
January 24, 2013

phy
A 0.5kg piece of metal (c = 600/kgK) at 300 degree celcius is dumped into a large pool of water at 20 degrees celcius. Assuming the change in temperature of water to be negligible, calculate the overall change in entropy for the system
January 24, 2013

phy
Calculate the change in internal energy of 2kg of water at 90 degree Celsius when it is changed to 3.30m3 of steam at 100oC . The whole process occurs at atmospheric pressure. The latent heat of vaporization of water is 2.26×106J/kg
January 24, 2013

phy
Calculate the electric power which must be supplied to the filament of of a light bulb operating at 3000K. The total surface area of the filament is 8×10−6m2 and its emissivity is 0.92.
January 24, 2013

phy
Tinny insects such as mosquitoes can seat on the surface of water. Which physical principle makes this possible?
January 24, 2013

phy
An electric kettle contains 1.5 kg of water at 100o C and powered by a 2.0 kW electric element. If the thermostat of the kettle fails to operate, approximately how long will it take for the kettle boil dry? (Take the specific latent heat of vaporization of water as 2000kJkg&#...
January 24, 2013

phy
If a force of 80N extends a spring of natural length 8m by 0.4m what will be the length of the spring when the applied force is 100N
January 24, 2013

phy
A string of natural length L extends to a new length L' under tensile force F. If Hooke’S law applies, the work done in stretching the spring is ------------
January 24, 2013

phy
An engine absorbs 2000J of heat from a hot reservoir and expels 750J to a cold reservoir during each operating cycle. What is the power output of the engine if each cycle lasts for 0.5 seconds?
January 24, 2013

PHYSICS
A box is lifted with a pry bar, by slipping the bar under the box and lifting up on the bar. If the pry bar is 2m in length and it is grasped at the end, and the box is located at the opposite end, the fulcrum, with its center of gravity at a distance of 0.5 m from the ...
March 7, 2011

Chem
A water sample is suspected to be contaminated by iron (III) ions. How could you determine if the sample is really contaminated?
October 25, 2010

math/equation/Paul
I meant is 12 the correct answer to the equation 4+8[9/3(9-6)]
January 4, 2010

math equation
Is the answer for this equation: 4+8[9/3(9-6)] = 12
January 4, 2010

english/MS SUE/SUBORDINATE CLAUSE
SO NUMBER 1 WHO TREATED POLIO PATIENTS. ITS AN ADJECTIVE CLAUSE. 5-WHEN YOU LEAVE FOR SCHOOL. ITS ADVERB CLAUSE.
November 12, 2009

english
Identifying the subordinate clauses.then write Noun,adjective, or adverb to tell what kind of clause it is. 1-Elizabeth Kenny was a nurse who treated polio patients. answer: who treated polio patients. its an adverb clause. 2-Whoever broke the window will have to pay for it. ...
November 12, 2009

grammar
Label each clause subordinate or independent. 1. If you visit the city of Chicago.subordinate 2.the Art Institute of Chicago is quite famous independent 3.While the Chicago White Sox play in Comiskey Park. subordinate 4.after the sears Tower was built subordinate 5.the Chicago...
November 8, 2009

grammar/Ms Sue
14 during the great fire (independent 15 After industries were rebuilt(subordinate
November 8, 2009

grammar
Tell if the sentences, are phrase write phrase if it is a clause, write independent or subordinate. 9 Before settlers arrived .(phrase) 10 In 1794 .(phrase) 11 When it became a city .(subordinate) 12 Chicago had its first railroad.(independent) 13 Before long .(phrase) 14 ...
November 8, 2009

Spanish
We have to translate the following sentences into spanish [we're working on subjunctive -- adverbial clauses.] He will insist until she accepts. My answer: Insistirá hasta que acepte. Is this right? I know insistir often carries along "en", but it doesn&#...
January 31, 2007

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