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klemol [59]
4 years ago
5

Suppose you average 75 MPH over the first halfof a drive, and your average speed for the entiredrive is 60 MPH. What was your av

erage speedfor the second half of the drive?
Physics
1 answer:
alexandr402 [8]4 years ago
5 0

Answer:

x = 45 MPH

Explanation:

given,

Average speed of the first half = 75 MPH

Average speed of entire ride = 60 MPH

Average speed of the second half = ?

let the average speed of the second half = x MPH

now,

average of entire ride is given as 60 mph so,

 \dfrac{75+x}{2} = 60

 75+x= 2\times 60

       75 + x = 120

         x = 120 -75

        x = 45 MPH

hence, the average speed of the second half comes out to be 45 MPH.

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You are cooking beef stew. When you take the beef stew off the stove, it has a temperature of 2008F. The room temperature is 758
Sholpan [36]

Answer:

Therefore it would take about 30 minutes to cool the beef stew to a serving temperature of 1008F

Explanation:

Given that:

The initial temperature of the stew(I) is 2008° F

The room temperature(R) is 758°F

The cooling rate of the beef stew(r) = 0.054

you need the beef stew to cool to a serving temperature(F) of 1008°F

To calculate How long (in minutes) will it take to cool the beef stew to a serving temperature of 1008°F we use the equation:

F=(I-R)e^{-rt} +R

Substituting values:

1008=(2008-758)e^{-0.054t} +758

1008=1250e^{-0.054t} +758

1008-758=1250e^{-0.054t}

250=1250e^{-0.054t}

\frac{250}{1250}=\frac{1250}{1250}e^{-0.054t}

0.2=e^{-0.054t}

taking natural log of both side

ln(0.2)=ln(e^{-0.054t})

-1.6094=-0.054t

t=29.8

Therefore it would take about 30 minutes to cool the beef stew to a serving temperature of 1008F

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Energy flow diagram of petrol driven lawnmower​
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A gravitational field is the field generated by a massive body, that extends into the entire space. Every object with mass m experiences a force F when immersed in a gravitational field. The intensity of the force is equal to
F= \frac{GM}{r^2}  m
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A possible way to measure the intensity of a gravitational field is by measuring the acceleration a of the object immersed in this field. In fact, for Newton's second law we have:
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