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notsponge [240]

3 years ago

11

I need a testable question that I can research and write an essay on. Please help

1 answer:

pishuonlain [190]3 years ago

4 0

Explanation:

how does pollution affect global warming?

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What is all the mediums that light can travel through

LenKa [72]

Answer:

Light travels as a wave. But unlike sound waves or water waves, it does not need any matter or material to carry its energy along. This means that light can travel through a vacuum—a completely airless space. (Sound, on the other hand, must travel through a solid, a liquid, or a gas.)

Explanation:

6 0

3 years ago

2. 38( C of charge move between the terminals of a battery with a potential difference of 9.00 V. How much energy does it gain?

timurjin [86]

Answer:

Energy = 21.42 Joules

Explanation:

Given the following data;

Charge = 2.38 C

Potential difference, v = 9 V

To find the energy gained;

Mathematically, it is given by the formula;

Energy = charge * potential difference

E = 2.38 * 9

E = 2.38 * 9

E = 21.42 Joules

5 0

3 years ago

A bullet of mass m 1 is fired into a rod of length L and mass m 2 which is pivoted on one end and rests on a frictionless horizo

Reptile [31]

Answer:

The angular speed of the rod is $w=(\frac{9m_{1}v_{i} }{4m_{2}L } )(1-\frac{1}{\sqrt{2} } )$

Explanation:

The final kinetic energy is:

$\frac{1}{2} mv_{f}^{2} =\frac{1}{2}(\frac{1}{2} mv_{i}^{2} )$

Clearing vf:

$v_{f} =\frac{1}{\sqrt{2} } v_{i}$

The conservation of angular momentum before and after collision is:

$m_{1} v_{i} (\frac{3L}{4} )=Iw+m_{1}v_{f} (\frac{3L}{4} )$

Clearing w:

$w=(\frac{9m_{1}v_{i} }{4m_{2}L } )(1-\frac{1}{\sqrt{2} } )$

3 0

3 years ago

A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a hor

finlep [7]

Answer:

The initial velocity is 38.46 m/s.

Explanation:

The horizontal distance travel by the tennis ball = 13 m

The height at which the tennis ball dropped = 56 cm

Now calculate the initial speed of tennis ball.

The vertical velocity is zero.

Below is the calculation. Here, first convert centimetre into kilometre. So, height at which ball dropped is 0.56 km.

$v = \sqrt{2 \times 9.8 \times 0.56} = 3.32 m/s \\$

$t = \frac{3.32}{9.8} = 0.338s \\$

$Ux \times t = 13 \\$

$Ux = \frac{13}{0.338} = 38.46 m/s = Initial velocity.$

8 0

4 years ago

an athlete sprints from 150 m south of the finish line to 65 m south of the finish line in 5.0s what is his average velocity

Ilya [14]

Total distance=150m-65m=85m
Time=5s

$\\ \rm\longrightarrow Avg\:Velocity=\dfrac{Total\:Distance}{Total\:Time}$

$\\ \rm\longrightarrow Avg\:Velocity=\dfrac{85}{5}$

$\\ \rm\longrightarrow Avg\:Velocity= 17m/s$

3 0

3 years ago

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