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3 years ago

I need help with my science question its this Explaining What factors affect an object's kinetic energy?

Physics

1 answer:

harkovskaia [24]3 years ago

8 0

Answer:

mass and speed

Explanation:

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A man has a mass of 110 kg. What is his weight? A. 110N B. 1325 N C. 559 N D. 1078 N

Slav-nsk [51]

Answer:

Option D

Explanation:

Given:

Mass = m = 110 kg

Acceleration due to gravity = g = 9.8 m/s

Required:

Weight = W = ?

Formula

W = mg

Solution:

W = (110)(9.8)

W = 1078 N

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3 years ago

If an object weighs 80 Newtons, what force must be applied to the rope to raise the object when the mechanical advantage is four

AnnyKZ [126]

80 -4f(45.56 - 56) solve and get answer

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3 years ago

2. A student places an object with a mass of m on a disk at a position r from the center of the disk. The student starts rotatin

ycow [4]

Answer:

$\frac{0.065}{r}$

Explanation:

The maximum velocity of an object moving in a curve beyond which it will slide off the curve is given by the relationship in equation (1);

$v=\sqrt{\mu gr}....................(1)$

where $\mu$ is the coefficient of friction between the object and the surface of the curve, g is acceleration due to gravity and r is the radius of the curve.

Given;

v = 0.8m/s

g = $9.81m/s^2$

r = ?

$\mu=?$

In order to solve for $\mu$ , we can simply make it the subject of formula from equation (1) as follows;

$v^2=\mu gr\\hence\\\mu=\frac{v^2}{gr}.................(2)$

since we were not given the value of r, we can just substitute other known values, then solve and leave the answer in terms of r.

Therefore;

$\mu=\frac{0.8^2}{9.81r}$

$\mu=\frac{0.64}{9.81r}\\\\\mu=\frac{0.065}{r}$

8 0

3 years ago

What is the relationship between distance and sound wave return time?

nekit [7.7K]

The time for the echo to return is directly proportional to the distance. vw = fλ. In a given medium under fixed conditions, vw is constant, so that there is a relationship between f and λ; the higher the frequency, the smaller the wavelength.

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3 years ago

In a certain time interval, natural gas with energy content of 19000 J was piped into a house during a winter day. In the same t

Bumek [7]

Explanation:

Since, it is mentioned the there occurs no change in the temperature. This also means that there will occur no change in thermal energy of the system.

Hence, $\Delta E$ = 0. And, as $\Delta E$ = 0 then there will be no work involved. This means that total energy added to the house will return to the outside air as heat.

Therefore,

Q = -(19000 J + 2000 J)

= -21000 J

or, |Q| = 21000 J

Thus, we can conclude that the magnitude of the energy transfer between the house and the outside air is 21000 J.

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3 years ago