Physics/Expert Profile

Average Ratings

• Knowledgeability 9.82
• Clarity of Response 9.70
• Timeliness 9.79
• Politeness 9.87

• Number of Questions (in Past 24 Hours) 0
• Max Questions to be Asked (in 24 Hour Period) 2
• Total Questions (since joining AllExperts) 2950
• Volunteer Since 2000-10-22
• Prestige Points 32022

Recent Reviews from Users

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    K = Knowledgeability    C = Clarity of Response    T = Timeliness    P = Politeness

User	Date	K	C	T	P	Comments
trishant	11/19/09	10	10	10	10
Kim	11/16/09	10	9	10	10
Haris Arshad	11/16/09	10	10	10	10
Jamil	11/14/09	10	10	10	10	Thank you very much! I appreaciate the .....
DIVYA	11/12/09	10	10	10	10	Thank you sir..your answer was very .....

Recent Answers from James J. Kovalcin

2009-11-18 Carnot Engine:

If 30% of the heat is dumped into the cold reservoir the efficiency of the process is 70% rather than 30%. In any case the ideal efficiency is given by: Eff=[Thot-Tcold]/Thot Which in this case becomes:

2009-11-17 radioactivity:

The energy of the incoming proton is converted into the mass of the resulting products. Mass is NOT conserved! What is conserved is mass-energy where mass and energy are different aspects of the same fundamental

2009-11-16 Circular Motion and Gravitational Forces:

Question 1 is a relative velocity question. Just add the velocity of you to the velocity of the bus! Question 2 is a Newton's 2nd Law problem where the net force F acting on an object is responsible for

2009-11-15 Physics:

All 2 dimensional kinematics problems can be solved in the same way. There are 6 kinematics variables: Do, Df, Vo,Vf, a and t. Along with these 6 variables there are 2 available equations: Df=1/2*a*t^2+Vo*T+Do

2009-11-14 Circular Motion and Gravitational Forces:

a) To determine the velocity of someone at the equator use the definition of velocity: v=dD/dT where dD is the distance moved and dT is the time passed. In the case of the Earth rotating the distance