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4 years ago

A vehicle travels 2345 meter in 35 second toward the evening sun in the West. What is its speed? A. 47 m/s West

Chemistry

1 answer:

snow_tiger [21]4 years ago

3 0

Explanation:

Speed = 2345 ÷ 35 = 67m/s

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What is the amount of heat, in joules, required to increase the temperature of a 49.5-gram sample of water from 22°C to 66°C?

charle [14.2K]

Answer:

3) 9.1 x 10^3 J

Explanation:

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3 years ago

Consider an electron placed in a region of space in which the electric potential spatially. The electron is placed at a point wh

loris [4]

Answer:

$1.33\cdot 10^7 m/s$

Explanation:

For a charged particle accelerated by an electric field, the kinetic energy gained by the particle is equal to the decrease in electric potential energy of the particle; therefore:

$K_f-K_i = -q\Delta V$

where

$K_f$ is the final kinetic energy

$K_i$ is the initial kinetic energy

q is the charge of the particle

$\Delta V$ is the potential difference

In this problem,

$q=-1.6\cdot 10^{-19}C$ is the charge of the electron

$\Delta V=-500 V-(-1000 V)=500 V$

The electron starts from rest, so its initial kinetic energy is

$K_i=0$

Therefore,

$K_f=-(-1.6\cdot 10^{-19})(500)=8\cdot 10^{-17}J$

We can write the final kinetic energy of the electron as

$K_f=\frac{1}{2}mv^2$

where

$m=9.11\cdot 10^{-31} kg$ is the electron mass

v is the final speed

And solving for v,

$v=\sqrt{\frac{2K_f}{m}}=\sqrt{\frac{2(8\cdot 10^{-17})}{9.11\cdot 10^{-31}}}=1.33\cdot 10^7 m/s$

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3 years ago

What is thermal energy?

Finger [1]

Answer:

D-the measure of temperature in a system

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3 years ago

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2. Why was it important to examine both the color and the streak of your minerals? Think about streak and explain why it’s calle

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It is important to examine both the colour and the streak of a mineral because the streak may be completely different from the colour of the hand specimen.
The streak of a mineral is the color it possesses after it has been grounded to a fine powder. The streak test has to be done on minerals because it is a more reliable way of identifying a mineral with its color.<span />

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4 years ago

if a scientist creates a new rock like substance in a laboratory, why wouldnt this type of material be classified as a true mine

ad-work [718]

The reason why it is not considered this is because the material was made in a lab, not through nature, which is what is required to be considered as a true mineral.

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3 years ago

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