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Afina-wow [57]
3 years ago
7

a diver on a board 7.5m above the water walks off the end with a horizontal velocity of 2.3 m/s when they hit the surface of the

water how far away from the edge of the board will they land ?
Physics
1 answer:
m_a_m_a [10]3 years ago
6 0

Answer:

2.846m

Explanation:

The diver is performing projectile motion.

To find x(final), we are going to use the equation x(final) = v(initial)*t + x(initial)

x(initial) = 0

x(final) = ?

v(initial) = 2.3 m/s

we don't know t

To find t we will use y(final) = 1/2*(-9.8)*t^2 + v(initial in the y dir.)*t + y(initial)

- 9.8 in the acceleration in the y dir.

y(final) = 0

y(initial) = 7.5

v(initial in the y dir.) = 0

If we solve for t we get: t = 1.237s

Now we have all the components to solve for x(final) in x(final) = v(initial)*t + x(initial)

x(final) = 2.3*1.237 + 0

x(final) = 2.846m

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What’s the potential difference across a 5.0 ohms resistor that carries a current of 5.0A
vivado [14]

Answer:

The correct answer is B-25 V

Explanation:

We apply Ohm's Law, according to which:

V = i x R

V = 5A x 5Ω

V= 25 V

Being V the potential difference whose unit is the VOLT, i the current intensity (Ampere) and R the electrical resistance (ohm)

3 0
3 years ago
How is heat transfer involved in the movement of tectonic plates?
Simora [160]

Mantle convection

Explanation:

The driver of moving plates is the mantle convection.

Convection is a heat transfer process that involves the movement of fluids from one place to another.

How does convection occur in the mantle?

  • Part of the mantle known as the asthenosphere is a hot liquid. It moves slowly and does not readily flow.
  • Over riding the asthenosphere is the brittle lithosphere made up of the upper mantle and the entirety of the crust.
  • The asthenosphere is at a higher temperature compared to the lithosphere on top.
  • In order to achieve stability and thermal equilibrium, the asthenosphere rises to the surface whereas the dense and cold lithosphere sinks down.
  • This way a convective cell is set up.
  • Hot materials rises to the surface because they are light whereas cold materials on the surface sinks into the asthenosphere.
  • Through this the plates moves.

Learn more:

Mantle brainly.com/question/9582362

#learnwithBrainly

8 0
3 years ago
"How do changes in voltage or resistance affect current in an electric circuit?"
kicyunya [14]
We can answer the question by looking at the Ohm's law, which gives us the relationship between voltage (V), current (I) and resistance (R) of a circuit:
V=IR
equivalently, we can rewrite it as
I= \frac{V}{R}

by looking at the equation, we can make the following observations:
1) The current is proportional to the voltage: therefore, if the voltage increases, the current increases as well; if the voltage decreases, the current decreases too.
2) The current is inversely proportional to the resistance: if the resistance increases, the current decreases, and if the resistance decreases, the current increases.
5 0
3 years ago
According to your graph, does the wave speed change with wave length?
fiasKO [112]

Yes

Explanation:

From the graph, we can deduce that the wavelength changes with the speed of the wave.

This is a simple linear graph. A linear graph has a steady gradient and it shows two variables that increases proportionately.

Using the graph, we can establish that as the wavelength of the wave increases the time taken for one wave to pass through increases.

The speed of a wave is given as:

                     V = fλ

   f is the frequency of the wave i.e the number of waves that passes through a point per unit of time

  λ is the wavelength of the wave

The vertical axis on the graph shows the time for 1 wave trip, this is the wave period, T

            f = \frac{1}{T}

Therefore;

    speed of the wave = \frac{λ}{T}

This can be evaluated by solving slope of the graph and finding the inverse.

We can see that as the speed of the wave changes, the wavelength will change.

 

learn more:

Wavelength brainly.com/question/6352445

#learnwithBrainly

3 0
3 years ago
The ability of a material to transfer heat or electric current is called
Kruka [31]
Conductivity,<span>the degree to which a specified material conducts electricity, calculated as the ratio of the current density in the material to the electric field that causes the flow of current. It is the reciprocal of the resistivity.</span>
7 0
3 years ago
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