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Vesna [10]
3 years ago
9

If only an external force can change the velocity of a body, how can the internal force of the brakes bring a car to rest? 1. It

is the driver, not the car itself who causes the breaking, so it is an external force. 2. The engine is stopped, so the car has no force to run further. 3. Some internal forces can change the velocity of a body. 4. It is the force of the road on the tires (an external force) that stops the car.
Physics
1 answer:
RoseWind [281]3 years ago
3 0

Answer:

4. It is the force of the road on the tires (an external force) that stops the car.

Explanation:

If there is no friction between the road and the tires, the car won't stop.

You can see this, for example, when there is ice on the road. You can still apply the brakes (internal force), but since there is no friction (external force) the car won't stop.

The force of the brakes on the wheels is not what makes the car stop, it is the friction of the road against still tires that makes it stop.

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A loaf of bread is removed from an oven and is left sitting in the kitchen to cool. Its temperature t minutes after being remove
Darya [45]
<h2>Answer:</h2>

<em><u>(a). 73° C. </u></em>

<em><u>(b). 176° C.</u></em>

<em><u>(c). 93.02°C.</u></em>

<h2>Explanation:</h2>

In the question,

We have been given an equation,

T(t) = 103e^{-0.0182t}+73.

(a).

We need to find the temperature of the kitchen,

So,

Time, t → ∞

On putting the value of t as infinite in the equation we get,

T(\infty)=103e^{-0.0182*\infty}+73\\T(\infty)=103*0+73\\T(\infty)=0+73\\T(\infty)=73\\

<em><u>Therefore, the temperature of the Kitchen is 73° C. </u></em>

(b).

The initial temperature of the bread when it is removed from the oven is at, t = 0 s

So,

On putting the value of t = 0, we get,

T(t) = 103e^{-0.0182t}+73.\\T(0)=103e^{-0.0182\times 0} + 73\\T(0)=103+73\\T(0)=176

<em><u>Therefore, the initial temperature of the bread is 176° C.</u></em>

(c).

On putting the value of t = 90 minutes, we get,

T(t) = 103e^{-0.0182t}+73.\\T(90)=103e^{-0.0182\times 90} + 73\\T(90)=20.0199+73\\T(90)=93.02

<em><u>Therefore, the temperature of the bread after 90 minutes is 93.02°C.</u></em>

<em><u></u></em>

8 0
3 years ago
Is loudness affected by change in frequency? Explain<br><br><br> I will mark you the brainliest
zmey [24]

Answer:

No

Explanation:

To increase or decrease loudness, you have to change the amplitude

4 0
3 years ago
Which types of heat transfer involve heat flow from hot objects to colder objects? A. convection, conduction, and radiation B. c
Soloha48 [4]
B is definitely the answer. Please let it be
4 0
3 years ago
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you happen to visit the moon when some people on earth see a total solar eclipse. who has a better experience of this event, you
Vinil7 [7]
The friends left on earth because they can see the total eclipse, where as you are on the moon witnessing sections get dark rather than the whole picture
5 0
3 years ago
Gravity is a <br><br> A.pushing force<br> B. not a force at all<br> C. pulling force
melamori03 [73]

Answer:

C

Explanation:

gravity is a pulling force according to Newton

4 0
2 years ago
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