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4 years ago

5

Calculate the time it takes for a cat who runs 3km and an average speed oh 6km/h

1 answer:

Yuki888 [10]4 years ago

7 0

Answer:

30 minutes

Explanation:

distance = speed * time and from that follows:

time = distance / speed

So if the distance is 3 km, and the speed is 6 km/h you get:

time = 3 / 6 = 0.5 h

which is the same as 30 minutes.

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Explain giving an example for;

Bingel [31]

$\boxed{\large{\bold{\red{ANSWER~:) }}}}$

The motion of a ball falling through the atmosphere, or a model rocket being launched up into the atmosphere are both excellent examples of Newton’s 1st law of motion.

Riding a bicycle is a good example of Newton’s 2nd law of motion.In this example, the bicycle is the mass. The leg muscles pushing on the pedals of the bicycle is the force.

You hit a wall with a certain amount of force, and the wall returns that same amount of force. This is an example of Newton’s 3rd law of motion

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3 years ago

When you skid to a stop on your bike, you can significantly heat the small patch of tire that rubs against the road surface. Sup

Lunna [17]

Answer:

$E=14.4\ J$

Explanation:

In this case the kinetic energy of the bike is converted into the heat energy between the area of contact of tyre and the road. This happens due to the work done by the frictional force between the surface to stop the relative motion between the road and the tyre.

Given:

normal force on the rear tyre, $N=45\ N$

(as given in the question that the rear tyre supports half the combined weight of the bike and the rider.)

distance dragged while stopping the tyre, $s=0.4\ m$

coefficient of kinetic friction between the surfaces, $\mu=0.8$

<u>Now, frictional force between the surfaces:</u>

$f=\mu.N$

$f=0.8\times 45$

$f=36\ N$

<u>Now, the work done by the kinetic friction:</u>

$W=f.s$

$W=36\times 0.4$

$W=14.4\ J$

According to the energy conservation this amount of energy is converted into thermal energy between the surfaces in contact, i.e. road and the tyre.

5 0

3 years ago

a sample of iron has the dimensions of 2cm times 3cm times 2cm. if the mass of this rectangular-shaped object is 94g, what is th

Anarel [89]

The answer is 7.83. The three is repeating.

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3 years ago

Which air mass is responsible for bringing warm, moist air to an area?

Vika [28.1K]

Answer:

Pretty sure it is air mass C

Explanation:

It looks like yhe air has warm air where as the other 2 options have cold air.

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3 years ago

Read 2 more answers

A uniform solid disk and a uniform ring are place side by side at the top of a rough incline of height h.

nadezda [96]

Explanation:

velocity of disc $=\sqrt((gh)/0.75)$

lets call (h) 1 m to make it simple.

= 3.614 m/s

$\sqrt((4/3) x 1 x 9.8) = 3.614$ m/s pointing towards this:

$4×V_d=\sqrt(4/3hg)$

$V_h=\sqrt(hg)$

velocity of hoop= $\sqrt(gh)$

lets call (h) 1m to make it simple again.

$\sqrt(9.8 x 1) = 3.13$ m/s

$\sqrt(gh) = sqrt(hg)so [tex]4×V_d= \sqrt(4/3hg)V_h=\sqrt(hg)$

The disc is the fastest.

While i'm on this subject i'll show you this:

Solid ball $=0.7v^2= gh$

solid disc $= 0.75v^2 = gh$

hoop $=v^2=gh$

The above is simplified from linear KE + rotational KE, the radius or mass makes no difference to the above formula.

The solid ball will be the faster of the 3, like above i'll show you.

solid ball: velocity $=\sqrt((gh)/0.7)$

let (h) be 1m again to compare.

$\sqrt((9.8 x 1)/0.7) = 3.741$ m/s

solid disk speed $=\sqrt((gh)/0.75)$

uniform hoop speed $=\sqrt(gh)$

solid sphere speed $=\sqrt((gh)/0.7)$

8 0

3 years ago