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4 years ago

14

If a ball is thrown,it would continue moving at the speed forever until something changed its speed or direction. Is this true o

r false

2 answers:

Pani-rosa [81]4 years ago

8 0

I believe it is false because as the ball begins to fall and becomes more distant the speed will become slower

Ronch [10]4 years ago

3 0

It is True. What changes its speed would be air friction or gravity... etc

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Water flows with constant speed through a garden hose that goes up to 27.5 cm high. if the water pressure is 132kpa at the botto

sergejj [24]

Answer:

The pressure at the top of the step is 129.303 kilopascals.

Explanation:

From Hydrostatics we find that the pressure difference between extremes of the water column is defined by the following formula, which is a particular case of the Bernoulli's Principle ( $v_{bottom}\approx v_{top}$ ):

$p_{bottom}-p_{top} = \rho\cdot g\cdot \Delta h$ (1)

$p_{bottom}$ , $p_{top}$ - Total pressures at the bottom and at the top, measured in pascals.

$\rho$ - Density of the water, measured in kilograms per cubic meter.

$\Delta h$ - Height difference of the step, measured in meters.

If we know that $p_{bottom} = 132000\,Pa$ , $\rho = 1000\,\frac{kg}{m^{3}}$ , $g = 9.807\,\frac{m}{s^{2}}$ and $\Delta h = 0.275\,m$ , then the pressure at the top of the step is:

$p_{top} = p_{bottom}-\rho\cdot g\cdot \Delta h$

$p_{top} = 132000\,Pa-\left(1000\,\frac{kg}{m^{3}} \right)\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (0.275\,m)$

$p_{top} = 129303.075\,Pa$

$p_{top} = 129.303\,kPa$

The pressure at the top of the step is 129.303 kilopascals.

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2 years ago

List and describe the main functions of the lobes and the human brain

sladkih [1.3K]

Answer:

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3 years ago

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erastovalidia [21]

The total energy produced by the generator is 3.45 kJ. Of this energy, 2.23 kJ are lost because friction and electrical resistance, so this amount of energy is converted into thermal energy. This means that the rest of the energy is available as electric energy, and it is equal to:
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4 years ago

The unit for IMA is _____. newtons joules meters IMA is unitless

Sonja [21]

The correct answer to the question is unitless i.e the IMA of a mechanical system has no unit.

EXPLANATION:

The IMA of a mechanical system stands for ideal mechanical advantage. It can be defined as the number of times the input or effort force provided to the mechanical system is multiplied under ideal conditions. The ideal conditions means that the system is free from friction, air resistance etc.

Let us consider $d_{i}$ is the distance over which the input force is applied.

Let $d_{0}$ is the distance over which the output force is applied.

The ideal mechanical advantage of the system is calculated as -

IMA = $\frac{d_{i}} {d_{0}}$ .

Both $d_{i}\ and\ d_{0}$ are measured in distance unit.

Hence, IMA is a unitless physical quantity.

7 0

4 years ago

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