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DerKrebs [107]
2 years ago
13

(a) The average mpg rating for an older model of a car is 24.8 miles to the gallon and it takes 6.60 x 10^5 J of work done on th

e car to drive one mile. Given that a gallon of gasoline gives 1.19 x 10^8 J of internal energy to the car, what is the amount of heat released to the atmosphere for each mile you drive the car?
Physics
1 answer:
Margarita [4]2 years ago
6 0

Answer:

the gasoline releases Q=-4138387 J/mile to the atmosphere

Explanation:

from the fist law of thermodynamics

ΔU = Q - W

where ΔU= change in internal energy , Q= heat received , W= work done by the system

then

Q = ΔU + W

knowing that

ΔU = internal energy per gallon * number of gallons consumed in 24.8 miles

= (-1.19 x 10^8 J/ gallon) * 1 gallon /24.8 miles = (-4798387 J/mile)

W = work done by mile= 6.60 x 10^5 J/mile

therefore the heat released per mile

Q = ΔU + W = -4798387 J/mile + 6.60 x 10^5 J/mile = -4138387 J

since Q is negative , energy is released into the atmosphere

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Answer:

See the explanation below

Explanation:

Density is defined as the relationship between mass and volume, i.e. the following equation can be used:

density = m/v

where:

density [kg/m^3]

m = mass [kg]

v = volume [m^3]

If we change the volume of a body by reducing its size, its mass will also decrease proportionally with a density as seen in the equation.

m = density*v

To understand this concept more clearly, let's use the following example:

We know that the density of water is equal to 1000 [kg/m^3], that is, 1 cubic meter of water contains 1000 kilograms of water, using the equation.

1000 = m /1

m = 1000*1 = 1000 [kg]

Now if we have 500 kilograms of water, that would pass with the volume so that the density remains constant.

1000 = 500/v

v = 500/1000

v = 0.5 [m^3]

We can see that the volume of water has halved. Since the mass of water was reduced by half. That is, the relationship between mass and volume is proportional to the density of the material or substance.

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3 years ago
Describe three ways that adults continue to guide children's emotions during the school-age
wolverine [178]
1. Always be the bigger person
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3 years ago
The spring in the muzzle of a child's spring gun has a spring constant of 730 N/m. To shoot a ball from the gun, first the sprin
Korolek [52]

Answer:

a. V=11.84 m/s

b.x=0.052m

Explanation:

a).

Given

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v_i=V*sin(31)

V=\frac{v_i}{sin(31)}=\frac{6.1m/s}{sin(31)}

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b).

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No friction on the ball so:

x^2=\frac{2*K_k}{K}

x=\sqrt{\frac{2*0.053kg*9.8m/s^2*1.9m}{730N/m}}

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Answer:True

Explanation:

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