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3 years ago

PLeaSe SoMeBodY HeLp

Physics

1 answer:

Lerok [7]3 years ago

5 0

1). Oört Cloud
2). Kuiper Belt
3). asteroids
4). meteorite

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You stand 17.5 m from a wall holding a tennis ball. You throw the tennis ball at the wall at an angle of 22.5∘ from the ground w

RUDIKE [14]

The height of the ball would be 4.32 m

<u>Explanation:</u>

Given-

Distance from the ball, s = 17.5 m

Angle of projection, θ = 22.5°

Initial speed, u = 24.5 m/s

Height, h = ?

Let t be the time taken.

Horizontal speed, $u_{x}$ = u cosθ

= 24.5 * cos 22.5°

= 24.5 * 0.924

= 22.64 m/s

Vertical velocity, $u_{y}$ = u sinθ

= 24.5 * sin 22.5°

= 24.5 * 0.383

= 9.38 m/s

We know,

$x = u * cos (theta) * t$

$17.5 = 22.64 * t\\\\t = 0.77s$

To calculate the height:

$h = ut - \frac{1}{2}gt^2$

$h = u sin (theta)t - \frac{1}{2} gt^2$

$h = 9.38 * 0.77 - \frac{1}{2} * 9.8 * (0.77)^2\\ \\h = 7.22 - 2.90\\\\h = 4.32m\\$

Therefore, height of the ball would be 4.32 m

3 0

4 years ago

A thermometer containing 0.10 g of mercury is cooled from 15 degrees celsius to 8.5 degrees celcius. How much energy left the me

loris [4]

To solve this exercise we will use the concept related to heat loss which is mathematically given as

$Q = mC_p \Delta T$

Where,

m = mass

$C_p$ = Specific Heat

$\Delta T =$ Change in temperature

Replacing with our values we have that

$m = 0.1g$

$C_p = 139J/Kg\cdot K \rightarrow$ Specific heat of mercury

$\Delta T = 8.5\°C-15\°C = -6.5\°C \Rightarrow -6.5K$

Replacing

$Q = (0.1*10^3)(138)(-6.5)\\Q = -0.09J$

Therefore the heat lost by mercury is 0.09J

5 0

3 years ago

How would you describe the magnetic field produced by a current in a straight wire?

Elena L [17]

The answer to this is C. The reason being is because if you were to use a compass then it would be making circular motions towards the middle of the wire.

4 0

4 years ago

Read 2 more answers

A 55.0 kg bungee jumper steps off a bridge with a light bungee cord tied to her and to the bridge. The unstretched length of the

lianna [129]

Answer:

$69.06\ \text{N/m}$

Explanation:

m = Mass of bungee jumper = 55 kg

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

h = Height at the bottom = 40 m

k = Spring constant

x = Displacement of bungee cord = 25 m

Applying the principle of conservation of energy to the system we have

$mgh=\dfrac{1}{2}kx^2\\\Rightarrow k=\dfrac{2mgh}{x^2}\\\Rightarrow k=\dfrac{2\times 55\times 9.81\times 40}{25^2}\\\Rightarrow k=69.06\ \text{N/m}$

The spring constant of the bungee cord is $69.06\ \text{N/m}$ .

5 0

3 years ago

What represents the impulse of the force in a graph of force versus time?

vovikov84 [41]

In the graph of the force vs the time:
Force is the gradient of the momentum versus the time.

If we get the area under the curve in this graph:
it will be calculated as : force * time
which gives the change in momentum or the impulse.

Therefore, the area under the curve <span>represents the impulse of the force in a graph of force versus time</span>

7 0

4 years ago