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nalin [4]
3 years ago
7

Please hurry please

Physics
1 answer:
Ghella [55]3 years ago
4 0

Answer:

0.765m

Explanation:

gravitational potential energy GPE = mass * acceleration due to gravity * height

Given

GPE = 30Joules

Mass m = 4kg

acceleration = 9.8m/s²

Required

Height h

From the formula

h = GPE/mg

h = 30/4(9.8)

h = 30/39.2

h = 0.765m\

Hence the height of the counter is 0.765m

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Explanation:

The refraction is the change in the direction of light while travelling from the one medium to another due to having different speeds in different mediums.

To determine how much light gets refracted, it depends on the density of substance and the wavelength and the angle at which light enters the substance.

Light travels more slowly in denser medium than the rarer medium. The refractive index of glass is more than water or air. Light gets refracted more in this. When the light travels from rarer to denser then the light will get bend towards the normal. When the light travels from denser to rarer then the light will get bend away from the normal.      

Glass is more denser than air or water. Water is more denser than the air. When light travels from air to glass then the light gets bends towards the normal. When the light travels from glass to the air then light gets bends away from the normal.

Therefore, the light gets refracted more in the glass than air to water.

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3 years ago
In order for a living organism to sustain its life, it must be able to
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Answer:

All living organisms have complex organization, they are able to grow and develop, they are able to reproduce and pass on genetic information to their offspring, they are able to acquire and release energy, and they are able to maintain stable internal environments.

Explanation:

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3 years ago
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Find the velocity. 10 points. Will give brainliest!
BARSIC [14]

Answer:

6.060606...

Explanation:

To figure out velocity, you divide the distance by the time it takes to travel that same distance, then you add your direction to it. So the distance would be 1000m and the time would be 2 minutes and 45 seconds and if you convert the minutes into fractions you would get 165 seconds than you would divide 1000m by 165 seconds and you would get 6.060606... seconds as her average velocity

4 0
4 years ago
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Answer:

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Explanation:

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3 years ago
An arrow is shot at 28.0° above the horizontal. Its initial speed is 50 m/s and it hits the target.
fomenos
<span> <span>We will need to work with the components of the velocity, in the x and the y direction. We will say up is positive so g is -9.81 m/s^2. 

Given that the angle was 32 degrees: 

Velocity up (in the y direction) is 55 m/s * sin 32 = 29.15 m/s 
And 

Velocity forward (in the x direction) is 55 m/s * cos 32 = 46.64 m/s 

The acceleration of gravity, -9.81 m/s2 continuously decreases the velocity in the y direction. At the maximum height, the velocity will be zero. This should make sense, for as soon as the decreasing velocity becomes negative, the arrow will start to fall. 

We have v = v(0) + at 

And we set this to zero and solve for t: 

0 = 29.15 + -9.81t 

9.81t = 29.15 

t = 2.97 seconds 

To calculate height at this point, we use the equation that calculates position based on time, acceleration, and initial velocity (we could use an alternate too, an equation derived from the one we are now using and v = v(0) + at. 

x = x(0) + v(0)t + (1/2)at^2 

x = 0 + 29.15 * 2.97 + 0.5 9.81 (2.97)^2 

x = 43.30 m 

For a projectile, the plot of distance traveled in the upward direction is a parabola, and it takes the same amount of time to come down as it did to go up. 

We can double 2.97 to get the time of impact on the target at 2(2.97) = 5.94 seconds 

(Alternately, if you like, you can solve 

0 = 0 + 29.15t + 0.5 9.81 t^2 

And find that the two roots are 0 and 5.94). 

http://www.math.com/students/calculators... will do the quadratic for you. 

Given a horizontal velocity of 46.64 m/s, we can calculate 

46.64 m/s (5.94 s) = 277 m for the distance of the target.</span></span>
6 0
3 years ago
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