How do forest fires affect the Earth's atmosphere?

A mechanic uses a mechanical lift to raise a car. The car weighs 11,000 N. The lift raises the car 2.5 m.

KengaRu [80]

Potential energy = (weight) x (height)

After the car has been raised 2.5 meters, it has

(11,000) x (2.5) = 27,500 Joules

MORE potential energy than it had before it was lifted.

That's the energy that has to come from the work you do to lift it.

Since no mechanical process is ever 100% efficient, the work required
to accomplish this task is at least 27,500 joules.

5 0

3 years ago

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In general, the ________ of a simple machine is the ratio of the distance over which the force is applied to the distance over w

KATRIN_1 [288]

The answer that best fits the blank provided above is MECHANICAL ADVANTAGE. Given that in simple machines, output should not be greater than the input therefore, the Mechanical advantage of a simple machine has its input forces multiplied instead which results in force amplification. The answer for this would be option A.

4 0

4 years ago

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Two blocks of ice, one four times as heavy as the other, are at rest on a frozen lake. A person pushes each block the same dista

ANEK [815]

Answer:

The kinetic energy of the heavier block after the push is equal to the kinetic energy of the lighter block

Explanation:

Kinetic energy of smaller object

$K=(1/2)mv^2$

where m= mass of smaller object and v= velocity of smaller object

Also, it is given that heavier object is four times the mass of lighter object and consider its velocity as V

kinetic energy of heavier block $K '= (1/2) (4m) V^2$

Now, For smaller block , $v^2 - u^2=2aS$

[by Newtons laws of motion]

Also, $v^2 = 2(F/m)S$

Where S= displacement, F= force, u= initial velocity

So, $K=(1/2)m[2(F/m)]S$

$\Rightarrow K = FS$

For heavier block ,

$V^2 - u^2 = 2a'S$

or, $V^2=2(F /4m)S$

So, $K '= (1/2)(4m)[2(F/4m)S$

$\Rightarrow K'= FS$

Therefore the kinetic energy of the heavier block after the push is equal to the kinetic energy of the lighter block

5 0

4 years ago

A client with a head injury is being monitored for increased intracranial pressure (ICP). The client's blood pressure is 90/60 m

artcher [175]

Answer:

$CPP=52mm \ Hg$

Explanation:

Cerebral Perfusion Pressure is obtained by subtracting IntraCranial Pressure(ICP) from the Mean Arterial Pressure(MAP). Adequate cerebral perfusion requires a minimum goal of $70mm \ Hg$ . MAP is obtained using the formula:-

$MAP=\frac{(diastolic \ blood \ pressure\times2)+\ systolic \ blood \ pressure)}{3}\\\\MAP=\frac{2\times60+90}{3}\\\\MAP=70mm \ Hg\\CPP=MAP-ICP\\CPP=70-18\\CPP=52mm \ Hg$

5 0

3 years ago

A proton in a cyclotron is moving with a speed of 2.97×107 m/s in a circle of radius 0.568 m. 1.67 × 10−27 kg is the mass of the

vivado [14]

Answer:

B = 0.546 T, F = 2.59 10⁻¹² N

Explanation:

The magnetic force is

F = q v x B

We can calculate the magnitude of the force and find the direction by the right hand rule

F = q v B sin θ

Let's use Newton's second law

F = m a

Acceleration is centripetal

a = v² / r

We substitute

q v B sin θ = m v² / r

The angle between the field and the radius of the circle is 90º so sin 90 = 1

q B = m v / r

B = m v / q r

Let's calculate ’

B = 1.67 10⁻²⁷ 2.97 10⁷ / (1.60 10⁻¹⁹ 0.568)

B = 0.546 T

The foce is

F = q v B

F = 1.60 10⁻¹⁹ 2.97 10⁷ 0.546

F = 2.59 10⁻¹² N

3 0

3 years ago