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Paraphin [41]
3 years ago
10

Plz help will mark brainliest

Mathematics
1 answer:
Ne4ueva [31]3 years ago
7 0
Use photomath trust meeee
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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
Julli [10]

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

6 0
3 years ago
Diego’s family car holds 18 gallons of fuel. Each day the car uses 0.6 gallons of fuel. A warning light comes on when the remain
Ne4ueva [31]

Answer:

Diego's family cannot drive the car for 28 days without the warning light turning on.

Step-by-step explanation:

Since the car uses 0.6 gallons per day, and Diego's family has been driving the car for 28 days, that means the total amount of fuel used is 0.6*28=16.8 gallons. To determine whether the warning light will be on or not, subtract the total amount of fuel - 18 gallons - by the amount of fuel already used. If the difference is greater than 1.5, that means the warning light will not come on. If the difference is less than or equal to 1.5, that means the warning light will come on. 18 - 16.8 = 1.2, since 1.2 gallons is less than 1.5 gallons, that means Diego's family cannot drive the car for 28 days without the warning light turning on.

6 0
3 years ago
Read 2 more answers
Please help with the question!
MAVERICK [17]

Answer:

68.2275604137

Step-by-step explanation:

you can round down

I hope this helps

8 0
3 years ago
A certain brand of coffee costs $6.99 for 24.2 ounces<br> What is the unit rate?
ivann1987 [24]
I believe it is $0.29 ( when rounded

You can do a proportion

Price / oz
6.99 / 24.2 = x / 1

I hope this helps and please mark brainliest!
4 0
2 years ago
To practice for a competition, George swam 720 meters in the pool each day for 2 weeks. How many kilometers did George swim in t
Mekhanik [1.2K]

10,080,000 (because 720×14, the total number of days he swam in two weeks, is 10,080 and then you divide it by .001, the number of kilometers in one meter, which gives you 10,080,00.)

6 0
3 years ago
Read 2 more answers
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