I'm pursing a Masters Degree in computer Science with an emphasis in Human Computer Interaction. I've been a teaching assistant both while pursuing my Masters and during my Undergrad and also worked as a private tutor. I enjoy learning and I enjoy helping people learn. There's something very satisfying about watching the light go on as someone grasps a new concept.
Three cables are used to support a container as shown. Determinethe angle formed by cables $A B$ and $A D .$(Figure cant copy)
A system does $1.80 \times 10^{8} \mathrm{J}$ of work while $7.50 \times 10^{8} \mathrm{J}$ of heat transfer occurs to the environment. What is the change in internal energy of the system assuming no other changes (such as in temperature or by the addition of fuel)?
(a) How much food energy will a man metabolize in the process of doing $35.0 \mathrm{kJ}$ of work with an efficiency of $5.00 \% ?$(b) How much heat transfer occurs to the environment to keep his temperature constant? Explicitly show how you follow the steps in the Problem-Solving Strategy for thermodynamics found in Problem-Solving Strategies for Thermodynamics.
(a) What is the average metabolic rate in watts of a man who metabolizes $10,500 \mathrm{kJ}$ of food energy in one day? (b) What is the maximum amount of work in joules he can do without breaking down fat, assuming a maximum efficiency of $20.0 \% ?(\mathrm{c})$ Compare his work output with the daily output of a 187-W (0.250-horsepower) motor.
a) How long will the energy in a $1470-\mathrm{kJ}(350-\mathrm{kcal})$ cup of yogurt last in a woman doing work at the rate of $150 \mathrm{W}$ with an efficiency of $20.0 \%$ (such as in leisurely climbing stairs)?(b) Does the time found in part (a) imply that it is easy to consume more food energy than you can reasonably expect to work off with exercise?
(a) A woman climbing the Washington Monument metabolizes $6.00 \times 10^{2} \mathrm{kJ}$ of food energy. If her efficiency is 18.0\%, how much heat transfer occurs to the environment to keep her temperature constant? (b) Discuss the amount of heat transfer found in (a). Is it consistent with the fact that you quickly warm up when exercising?
