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3 years ago

A driver starts is parked car and within 5 seconds reaches a speed of 60km/h, as he travels east. What his acceleration?

Physics

1 answer:

atroni [7]3 years ago

3 0

The acceleration of the car is 3.3 m/s²

<u>Explanation:</u>

Given-

Speed of the car, (we can represent as s) = 60 km/hr = 60 × $\frac{5}{18}$ = 16.67 m/s

Time,(we can represent as t) = 5 s

Acceleration, (we can represent as a) = ?

We know,

a = $\frac{s}{t}$

a = $\frac{16.67}{5}$

a = 3.334 m/s²

The acceleration of the car is 3.3 m/s²

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A leaky 10-kg bucket is lifted from the ground to a height of 10 m at a constant speed with a rope that weighs 0.9 kg/m. Initial

sladkih [1.3K]

Answer:

The work done shall be 14715 Joules

Explanation:

The work done by a force 'F' in a displacement 'dy' is given by

$W=m(y)g\times dy$

At any position 'y' the weight shall be sum of weft of water and weight of string

$\therefore m(y)=m_{water}(y)+m_{string}(y)\\\\m(y)=30(1-\frac{y}{10})+0.9y$

Thus applying values we get

$W=\int m(y)g\times dy\\\\W=\int_{0}^{10}(30(1-\frac{y}{10}+0.9y)\times g)dy\\\\Solving\\W=294.3\int_{0}^{10}(1-\frac{y}{10}+0.9y)dy\\\\W=14715J$

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2 years ago

To determine a waves frequency you must know the??

lutik1710 [3]

Answer: I think, the number of oscillations in a given period of time.

Explanation: Well I guess because in a period time is known as the rate of occurrence of the wave. Hope this helps!

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3 years ago

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A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon

nirvana33 [79]

It gets larger because
well let me give you an example
so today in class we looked at a lava lamp with wax inside and there was a lightbulb at the bottom.
we watched as the wax floated up because the molecules inside the wax spreads out and makes the wax less dense.
the wax floats up because (which is related to the balloon getting bigger) the wax is getting less dense and the particles get bigger which ALSO makes the wax less dense.
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3 years ago

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Makovka662 [10]

Answer:

0.51 m

Explanation:

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Kinetic energy, KE=½kx²

Where k is spring constant and x is the compression of spring

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Where g is acceleration due to gravity, h is height and m is mass

Equating KE=PE

mgh=½kx²

Making x the subject of formula

$x=\sqrt {\frac {2mgh}{k}}$

Substituting 9.81 m/s² for g, 1300 kg for m, 10m for h and 1000000 for k then

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2 years ago

Why is water considered to be a complex compound

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$HEY THERE !!$

$\huge{COMPOUND:-}$
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3 years ago

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