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3 years ago

8

A man inside the water seea a fish in water. will the fish appear to man in it's actual position? will the man appear to fish in

his actual position?

2 answers:

weqwewe [10]3 years ago

4 0

Answer:

no

Explanation:

due to the refraction of light,meaning bending of light when it passes from diffrent mediums with diffrent densities

(probably mot the complete ans but smtg like this)

fiasKO [112]3 years ago

3 0

No man will not even go near and fish will but not same position

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When a bow is stretched it stores 10j and the arrows mass is 50g as it is projected show that the arrow has a speed of 20m/s

asambeis [7]

Answer:

20 m/s

Explanation:

The stored energy is transformed to kinetic energy and since kinetic energy is given by

$0.5mv^{2}$

where m is the mass of arrow in Kg and v is the velocity of the arrow in m/s. From the principle of energy, all the energy is transformed to KE.

KE= Energy stored in bow

Changing mass from 50 g to Kg we divide by 1000 hence m=50/1000=0.05 Kg

Substituting 0.05 Kg for m and 10 J for KE then we have

0.5\times 0.05\times v^{2}=10 J

Making v the subject of the formula then

$v=\sqrt {\frac {10 J}{0.5\times 0.05 Kg}}=20\ m/s$

Therefore, the velocity is equivalent to 20 m/s

6 0

3 years ago

Since all objects are weightless in orbit, how is it possible for an orbiting astronaut to tell if one object has more mass than

Vaselesa [24]

that is real easy the size,shape,

4 0

3 years ago

A car with a mass of 500 kg, gets off road and goes straight into a cliff of 30 m with an

mars1129 [50]

Answer:

The velocity of the car when it hits the ground is approximately 55.574 meters per second.

Explanation:

According to this expression, the car goes straight into the cliff and goes down due to gravity, whose situation is described by the Principle of Energy Conservation and supposing that all non-conservative forces are negligible:

$U_{g,1}+K_{1} = U_{g,2}+K_{2}$ (1)

Where:

$U_{g,1}$ , $U_{g,2}$ - Gravitational potential energies of the car at the top and the bottom, measured in joules.

$K_{1}$ , $K_{2}$ - Translational kinetic energies of the car at the top and the bottom, measured in joules.

By definitions of gravitational potential and translational kinetic energies, we expand and simplify the equation above:

$\frac{1}{2}\cdot m\cdot v_{2}^{2} = \frac{1}{2}\cdot m \cdot v_{1}^{2}+m\cdot g \cdot (z_{1}-z_{2})$ (2)

$v_{2}^{2} = v_{1}^{2}+2\cdot g\cdot (z_{1}-z_{2})$

$v_{2} = \sqrt{v_{1}^{2}+2\cdot g\cdot (z_{1}-z_{2})}$

Where:

$m$ - Mass, measured in kilograms.

$v_{1}$ , $v_{2}$ - Velocity of the car at the top and the bottom, measured in meters per second.

$g$ - Gravitaitional acceleration, measured in meters per square second.

$z_{1}$ , $z_{2}$ - Height of the car at the top and at the bottom, measured in meters.

If we know that $v_{1} = 50\,\frac{m}{s}$ , $g = 9.807\,\frac{m}{s^{2}}$ , $z_{1} = 30\,m$ and $z_{2} = 0\,m$ , then the velocity of the car when it hits the ground is:

$v_{2} = \sqrt{\left(50\,\frac{m}{s} \right)^{2}+2\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (30\,m-0\,m)}$

$v_{2}\approx 55.574\,\frac{m}{s}$

The velocity of the car when it hits the ground is approximately 55.574 meters per second.

7 0

3 years ago

Which of these is an example of interference? A. two lasers pointing away from each other В. two different light waves colliding

iren2701 [21]

Answer:

I believe the answer is B. Although it might be C.

Explanation:

I hope this helps!

6 0

3 years ago

The efficiency of the wedge is low because of _____.<br> width<br> friction<br> length<br> height

eduard

The efficiency of the wedge is low because of friction. The amount of work it supplies is small compared to the amount of work output. The internal resistance of the wedge is incredibly high due to its heavy weight at the other end of the blade.

5 0

3 years ago

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