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  1. L

    Find f`(x) for the tangent line of the graph

    y=-8/5x+8.2 is this answer correct?
  2. L

    Find f`(x) for the tangent line of the graph

    Homework Statement Suppose line tangent to graph of y=f(x) at x =3 passes through (-3, 7) & (2,-1). Find f'(3), what is the equation of the tangent line to f at 3? Homework Equations I found the slope of which equals -8/5 Im not sure how to find the equation... do I do...
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    Weight Chart finding average

    okkk now I understand what you mean thank you!!!!!
  4. L

    Weight Chart finding average

    Im not really understanding what your trying to explain. so the rate of weight is not used?
  5. L

    Factor volume changed

    No, I dont understand your steps of what to do.
  6. L

    Weight Chart finding average

    Ok thanks I got A and B. For part C Im not sure, Do I divide 1.53 (from part A) by 12?
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    Factor volume changed

    Homework Statement Initially, A yoga ball is partially blown up and its surface area measured. Afterwards, it is filled completely and its surface area is found to be 1.50 times as big as it was recorded earlier. By what factor has its volume changed? Im not sure how to solve for...
  8. L

    Weight Chart finding average

    So for part A I should subtract 7.4-6.6 9.6-7.4 11.2 -9.6 add the totals together and divide by three?
  9. L

    Weight Chart finding average

    Homework Statement The weight of a baby measured over an 11-month period is given in the weight chart below for this problem. Weight (lb) Age (months) 6.6 0 (birth) 7.4 1.0 9.6 2.0 11.2 3.0 12.0 4.0 13.6 5.0...
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    Thermodynamics and heat engine

    Homework Statement A certain engine can propel a 1600 kg car from rest to a speed of 22 m/s in 9.7 s with an efficiency of 23%. what is the rate of heat flow into the engine at the high temperature? what is the rate of heat flow out of the engine at the low temperature? 2. Homework...
  11. L

    PV diagrams monatomic ideal gas

    Homework Statement Suppose a monatomic ideal gas is changed from state A to state D by one of the processes shown on the PV diagram. (Let V1 = 4.80 L and P1 = 3.30 atm.) (a) Find the total work done on the gas if it follows the constant pressure path A−E followed by the constant...
  12. L

    Rate will this student burn calories

    Yes your right but even with that I still get the wrong answer
  13. L

    Rate will this student burn calories

    rate will this student "burn" calories Homework Statement A student wants to lose some weight. He knows that rigorous aerobic activity uses about 700 kcal/h (2900 kJ/h) and that it takes about 2000 kcal per day (8400 kJ) just to support necessary biological functions, including keeping the...
  14. L

    Rate of heat transfer passing from the boiling water to the ice bath

    Q/ Time = (Thermal conductivity) x (Area) x (Thot - Tcold)/Thickness thermal conductivity of copper = 401 W/m K thermal conductivity of iron = 80 W/m K For copper heat conduction: Q/t = 401 * .0006 m^2 * (100C - 0C) / .20 m thickness Q/t = 120.3 watts conduction heat loss up to iron...
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    Rate of heat transfer passing from the boiling water to the ice bath

    Homework Statement A copper rod of length 0.20 m and cross-sectional area 6.00 10-2 cm2 is connected to an iron rod with the same cross section and length 0.28 m (the figure below). One end of the copper is immersed in boiling water and the other end is at the junction with the iron. If the...
  16. L

    Finding number density and average distance between molecules

    ohh multiply them and then do the same thing as I did before.
  17. L

    Finding number density and average distance between molecules

    Homework Statement At 0.0° C and 1.00 atm, 0.95 mol of a gas occupies a volume of 0.0213 m3. (b) Estimate the average distance between the gas molecules.
  18. L

    What fraction of the air molecules

    Yes!!! that was correct Thank you D H!!!
  19. L

    What fraction of the air molecules

    yeh, Thank you for your help, Im going to email my proffessor about the question
  20. L

    What fraction of the air molecules

    No and No... Im not sure why its doing this.
  21. L

    What fraction of the air molecules

    I put the answer but for some reason its still saying its incorrect?
  22. L

    What fraction of the air molecules

    its supposed to says 3.7 percent... I subtracted the 96.3 from 100
  23. L

    What fraction of the air molecules

    Homework Statement What fraction of the air molecules in a house must be pushed outside while the furnace raises the inside temperature from 17.0° C to 28.0° C? The pressure does not change since the house is not 100% airtight. Homework Equations v2/v1=17+273/28+273 =.963 Why is my...
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