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4 years ago

What conditions are necessary for an artesian well

1 answer:

7 0

The geologic conditions necessary for an artesian well are an inclined aquifer sandwiched between impervious rock layers above and below that trap water in it. Water enters the exposed edge of the aquifer at a high elevation and percolates downward through interconnected pore spaces.

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Professional baseball pitchers deliver pitches that can reach the blazing speed of 100 mph (miles per hour). A local team has dr

Wittaler [7]

Answer:

A. ) K =126. 7 J

B. ) h= 91.1 m.

Explanation:

Assuming no air resistance, once released by the pitcher, the speed must keep constant through all the trajectory, so the kinetic energy of the ball can be expressed as follows:

$K = \frac{1}{2}*m*v^{2} = \frac{1}{2}*0.142 kg*(42.24m/s)^{2} = 126.7 J (1)$

Neglecting air resistance, total mechanical energy must be the same at any point, so, if we choose the ground level as the zero reference level for the gravitational potential energy, and assuming that the ball attains this kinetic energy just before striking ground, this value must be equal to the gravitational potential energy just before be dropped, so we can write the following equality:

$U_{o} = K_{f} = 126. 7 J (2)$

⇒ m*g*h = 126. 7 J

Solving for h, we get:

$h = \frac{K_{f}}{m*g} = \frac{126.7J}{0.1420kg*9.8m/s2} = 91.1 m (3)$

4 0

3 years ago

Two 2.0cm×2.0cm metal electrodes are spaced 1.0 mm apart and connected by wires to the terminals of a 9.0 v battery. What is the

Fantom [35]

Answer:

The charge on each electrode is

$q=0.354 x10^{-12}$

Explanation:

The charge to find the equation is development

V=9v

$d=1.0 mm\\A=2cm*2cm=0.02m*0.02m\\A=4x10^{-4} \\E_{o} =8.85x10^{-12} (\frac{C^{2} }{N*m^{2} } )$

$q=C*V$

$C=\frac{E_{o}*A }{d} \\C=\frac{8.85x10^{-12} *4x10^{-4} }{0.01}=0.354 \\$

$q=0.354*9v\\q=3.186x10^{-12} C$

3 0

4 years ago

The latent heat of vaporization of H₂O at body temperature (37°C) is 2.42 x 10⁶ J/kg. To cool the body of a 60.4-kg jogger [aver

Darya [45]

Answer:

Explanation:

Latent heat of vaporization of $H_{2}O$ at 37°C is $2.42\times10^{6}\text{ }\frac{J}{kg}$ .

When the sweat on our body evaporates, it absorbs energy from our body to overcome it's Latent heat of vaporisation. Thus our body cools down when sweat evaporates.

So, Energy absorbed by sweat to evaporate = Energy lost by body

Specific heat capacity of human body = $3500\text{ }\frac{J}{kg\text{ }C^{o}}$ . Jogger weights 60.4 kg. Body temperature decreases by $1.08\text{ }C^{o}$

Energy absorbed from body = $mS\Delta T=3500\times60.4\times 1.08 =228312\text{ }J$

$228312\text{ }J=\text{Energy absorbed by sweat}=mC=m\times2.42\times10^{6}\\m=0.094\text{ }kg$

∴ 0.094 kg of sweat has evaporated from the body.

8 0

3 years ago

Pam rubs a balloon on her head and then holds the balloon up against a wall. Why might the balloon stick to the wall?

gregori [183]

Answer:

It sticks to the wall due to electrostatics.

Explanation:

When pam rubs a balloon against his hair, and holds it up against the wall, he is basically adding a surplus of electrons which are negative charges to the surface of the balloon.

This motion would make the wall the more positively charged than the balloon. Therefore, when the two charges come in contact with each other, the balloon will stick to the wall because of the rule in electrostatics that opposite charges attract each other.

4 0

3 years ago

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You are going to invent a new device that people can use instead of a microwave oven to warm up leftovers. Which type of electro

kicyunya [14]

If you are going to invent a new device that people can use instead of a microwave oven to warm up leftovers, the type of electromagnetic wave that would be most useful to investigate would probably be infrared waves, because these kinds of waves are associated with heat.

7 0

4 years ago

Read 2 more answers