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  1. R

    Need help. How do i start the problem, thank you.

    Homework Statement A basketball player does 2.43 X 105 J of work during her time in the game, and evaporates 0.110 kg of water. Assuming latent heat of 2.26 X 106 J/kg for the perspiration (the same as for water), (a) determine the change in the player’s internal energy, and (b) the number...
  2. R

    Tourist Submarine

    Homework Statement A submarine called the Deep View 66 is currently being developed to take 66 tourists at a time on sightseeing trips to tropical coral reefs. According to guidelines of the American Society of Mechanical Engineers (ASME), to be safe for human occupancy the Deep View 66...
  3. R

    Pressure of person on chair Question

    Homework Statement A 67 kg person sits on a 3.6 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.4 cm in diameter. Homework Equations p= M/V P= F/A Pg = P - Pat Pat = 1.01 x 105 N/m2 The Attempt at a Solution I figured out the area of the circle using the...
  4. R

    Stoichiometry applied to xN2 + yH2

    6.0 moles of N2 thats are mixed with 12.0 moles of H2 according to the following equation: The equation is already balanced: N2(g)+ 3H2(g) yields 2NH3 (g) The questions asks for what is the chemical in excess? is it H2 or N2 I solved the problem but i want to make sure if it is right...
  5. R

    So far am i correct

    idk if i did this correctly so far so here goes. The question states A large rubber ball (8.80 kg) is fired straight down from the roof of a building from a spring loaded mechanism that stored 987 J of elastic potential energy. The building roof is 14.0 meters above ground. The rubber...
  6. R

    Did i do this problem correctly

    idk if i did this correctly so far so here goes. The question states A large rubber ball (8.80 kg) is fired straight down from the roof of a building from a spring loaded mechanism that stored 987 J of elastic potential energy. The building roof is 14.0 meters above ground. The rubber...
  7. R

    Why does a desk lamp often have small holes at the top of the Metal Lampshad

    Question is Why does a desk lamp often has small holes near the top of the metal lampshade. How do these holes keep the lamp cool. This is what i think. Heat travels upward by air convection. Since air is a poor conductor, very little heat travels sideways. That is my reason what do u...
  8. R

    Did i do this problem right

    This was the question On a pleasant fall day (temperature of 21.0 degree Celcius) a lump of clay (with mass of .855 kg) is thrown against the wall with a speed of 38.0 m/s. The clay deforms as it sticks to the wall, noiselessly. Assuming no heat escapes into the air, what will be the final...
  9. R

    A problem

    k the question states On a pleasant fall day (temperature of 21.0 degree Celcius) a lump of clay (with mass of .855 kg) is thrown against the wall with a speed of 38.0 m/s. The clay deforms as it sticks to the wall, noiselessly. Assuming no heat escapes into the air, what will be the...
  10. R

    A problem help

    The question states. Peter is heating water on the stove to boil eggs for a picnic. How much heat is required to raise the temperature of his 10.0 kg vat of water from 20.0 degrees celcius too 100 degree celcius. I worked out my problem in this format Delta Q= mass times specific heat...
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