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Rashid [163]
3 years ago
8

In a game of football outdoors on a cold day, a player will begin to feel exhausted after using approximately 8.0 × 105 J of int

ernal energy. (a) One player, dressed too lightly for the weather, has to leave the game after losing 6.7 × 105 J of heat. How much work has he done? (b) Another player, wearing clothes that offer better protection against heat loss, is able to remain in the game long enough to do 2.6 × 105 J of work. What is the magnitude of the heat that he has lost?
Mathematics
1 answer:
Julli [10]3 years ago
6 0

Answer:

a) How much work has he done = dW = 1.3 × 105 J

b) What is the magnitude of the heat that he has lost = dQ = -5.4 × 105 J

Step-by-step explanation:

  • From the first law of thermodynamics; dQ = dU + dW
  • dU = -8.0 × 105 J
  • dQ = -6.7 × 105 J

Hence, work done dW = dQ - dU

dW = -6.7 × 105 J - ( -8.0 × 105 J)

dW = 1.3 × 105 J is the work done by the player

  • for heat lost; from dQ = dW + dU
  • dU = -8.0 × 105 J and dW = 2.6 × 105 J
  • heat lost dQ = 2.6 × 105 J + ( -8.0 × 105 J)
  • dQ = -5.4 × 105 J
  • The negative is as a result of heat lost by the player

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Jaydon has eaten 3.6% his 45 ounce block of chocolate
elena-s [515]

Answer:

The answer is 1.62 ounce

Step-by-step explanation:

<h3><u>Given</u>;</h3>
  • Jaydon has eaten 3.6% of his 45 ounce block of chocolate fudge.
<h3><u>T</u><u>o</u><u> Find</u>;</h3>
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Now,

3.6% of his 45 ounce

45 × 3.6 ÷ 100

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Thus, Jaydon has eaten 1.62 ounce block of chocolate fudge.

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Explanation:

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4 0
3 years ago
Large samples of women and men are​ obtained, and the hemoglobin level is measured in each subject. Here is the​ 95% confidence
qwelly [4]

Answer:

a) Because the confidence interval  does not include  0​ it appears that there

is  a significant difference between the mean level of hemoglobin in women and the mean level of hemoglobin in men.

b)There is​ 95% confidence that the interval from  −1.76 g/dL<μ1−μ2<−1.62 g/dL actually contains the value of the difference between the two population means μ1−μ2

c)   1.62 < μ1−μ2< 1.76

Step-by-step explanation:

a) What does the confidence interval suggest about equality of the mean hemoglobin level in women and the mean hemoglobin level in​ men?

Given:

95% confidence interval for the difference between the two population​ means:

−1.76g/dL< μ1−μ2 < −1.62g/dL

population 1 =  measures from women

population 2 =  measures from men

Solution:

a)

The given confidence interval has upper and lower bound of 1-62 and -1.76. This confidence interval does not contain 0. This shows that the population means difference is not likely to be 0. Thus the confidence interval implies that the mean hemoglobin level in women and the mean hemoglobin level in​ men is not equal and that the  women are likely to have less hemoglobin than men. This depicts that there is significant difference between mean hemoglobin level in women and the mean hemoglobin level in​ men.

b)  

There is​ 95% confidence that the interval −1.76 g/dL<μ1−μ2<−1.62 g/dL actually contains the value of the difference between the two population means μ1−μ2.

c)

If we interchange men and women then

  • confidence interval range sign will become positive.
  • μ1 becomes the population mean of the hemoglobin level in men
  • μ2 becomes the population mean of the hemoglobin level in women
  • So confidence interval becomes:

                                          1.62 g/dL<μ1−μ2<1.76 g/dL.

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