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3 years ago

7

Instructions:Type the correct answer in each box. Round your answers to the nearest hundredth.

2 answers:

Flura [38]3 years ago

6 0

Answer:

7.35 Joule, 3.13 m/s

Explanation:

The energy possessed by the position of the body is called potential energy of the body.

The formula for the potential energy is given by

P.E = m g h

Here, m = 1.5 kg, g = 9.8 m/s^2, h = 0.5 m

So, potential energy at B

P.E. = 1.5 x 9.8 x 0.5 = 7.35 Joule

The potential energy at B is converted into kinetic energy at point A.

$m g h = 0.5 m v^{2}$

$v = \sqrt{2gh}$

v = \sqrt{2 \times 9.8\times 0.5}

v = 3.13 m/s

Rama09 [41]3 years ago

4 0

42 fiths of everything

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a projectile whose masss is 10g is fired directly upward from ground level with an initial velocity of 1000m/s neglecting the ef

sammy [17]

Answer:

<em>The speed of the projectile when it impacts the ground is 1000 m/s</em>

Explanation:

<u>Vertical Launch</u>

When an object is launched vertically and upwards it starts to move at an initial speed vo, then the acceleration of gravity makes that speed to reduce until it reaches 0. The object has reached its maximum height. Then, it starts to move downwards in free fall, with initial speed zero and gradually increasing it until it reaches the ground level. We will demonstrate that the speed it has when impacts the ground is the same (and opposite) as the initial speed vo.

The speed when the object is moving upwards is given by

$v_f=v_o-g.t$

The time it takes to reach the maximum height is when vf=0, i.e.

$0=v_o-g.t$

solving for t

$\displaystyle t=\frac{v_o}{g}$

The maximum height reached is

$\displaystyle y=\frac{gt^2}{2}=\frac{v_o^2}{2g}$

Then, the object starts to fall. The object's height is given by

$\displaystyle y=\frac{v_o^2}{2g}-\frac{gt'^2}{2}$

where t' is the time the object has traveled downwards. The height will be 0 again when

$\displaystyle \frac{v_o^2}{2g}=\frac{gt'^2}{2}$

Solving for t'

$\displaystyle t'=\frac{v_o}{g}$

We can see the time it takes to reach the maximum height is the same it takes to return to ground level. Of course, the speed when it happens is

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Thus, the speed of the projectile when it impacts the ground is 1000 m/s

4 0

4 years ago

3. Which form of radiation is used to kill microorganisms?

inn [45]

Answer:

d

Explanation:

uv is safe for humans but bad for bacteria etc... at least I think. I'm sorry if I'm wrong

4 0

3 years ago

Use the exact values you enter to make later calculations. Jack and Jill are on two different floors of their high rise office b

erastovalidia [21]

The part B of the question is missing and it is;

b) What is the height between the two window ledges?

Answer:

A) 20.76 m/s

B) 161.52 m

Explanation:

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v = u + at

Making u the subject gives;

u = v - at

Where;

v is the final velocity which is the speed when Jill sees the pot = 60 m/s

u is the initial velocity which is the speed when Jack sees the pot go by

t is the time between the two observed events = 4 s

a in this question is acceleration due to gravity = 9.81 m/s².

Plugging in the relevant values into the initial velocity equation gives;

u = 60 - (9.81 × 4)

u = 20.76 m/s

B) To get the height difference, we will use the formula;

(y1 - y0) = ut + ½at²

Thus, plugging in the relevant values, we have;

y1 - y0 = (20.76 × 4) + (½ × 9.81 × 4²)

(y1 - y0) = 161.52 m

3 0

4 years ago

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Effectus [21]

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Explanation:

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scoray [572]

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3 0

4 years ago