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3 years ago

Which type of elements are likely to have no electical charge at all

Physics

2 answers:

boyakko [2]3 years ago

6 0

Answer:

Noble gas element

Explanation:

because Noble gas element can neither loose nor gain electrons

vaieri [72.5K]3 years ago

3 0

Answer: Neutrons

Explanation:A subatomic particle that has no charge and is located inside the nucleus is called neutrons

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A spacecraft is launched from Earth toward the moon.

Leona [35]

Closer to the moon than to Earth because Earth has a greater mass than the moon

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the velocity of sound in a certain medium is 1000 m/s. If sound wave has a frequency of 500 Hz, the wavelength would be _.

nignag [31]

Answer:2meter

Explanation:

Velocity=1000m/s

Frequency=500Hz

wavelength=velocity ➗ frequency

Wavelength=1000 ➗ 500

Wavelength=2meter

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3 years ago

Which of the following objects exerts a gravitational force?

kompoz [17]

the earth exerts a gravitational force

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3 years ago

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What is the pressure inside such a balloon (in atm) if it starts out at sea level with a temperature of 12.8°C and rises to an a

tatiyna

Answer:

The final pressure inside the balloon will be $P_2=0.0359\ atm$ .

Explanation:

Given initial temperature of the balloon is $T_1=12.8\°C$

And the final temperature of the balloon is $T_2=-47.7\°C$

Initially, the balloon is at atmospheric pressure $P_1=1\ atm$ and volume be $V_1$

And the final pressure in the balloon is $P_2$ and the volume be $V_2$

Also, it is given in the question that the final volume became twenty-two times the original volume.

We can write $V_2=22V_1$

Now, using ideal gas equation.

$\frac{P_2V_2}{P_1V_1}=\frac{nRT_2}{nRT_2}$

Where, $R$ is the gas constant. And $n$ is moles of substance inside the balloon.

In our problem the value of $n$ will be the same for both cases. Also, $R$ is the gas constant.

$\frac{P_2V_2}{P_1V_1}=\frac{T_2}{T_1}$

Also, we have $V_2=22V_1$ from the question.

$\frac{P_2\times 22V_1}{P_1V_1}=\frac{T_2}{T_1}\\\\\frac{P_2\times 22}{P_1}=\frac{T_2}{T_1}$

We need to convert the temperature from $\°C$ to Kelvin.

$T_1=12.8\°C\\T_1=12.8+273.15=285.95\\T_2=-47.7\°C\\T_2=-47.7+273.15=225.45$

Plug these values we get,

$\frac{P_2\times 22}{1}=\frac{225.45}{285.95}\\\\22\times P_2=0.789\\P_2=\frac{0.789}{22}\\P_2=0.0359\ atm.$

So, the final pressure inside the balloon will be $P_2=0.0359\ atm$ .

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3 years ago

How much power is used if an athlete lifts a 50N weight up 2 meters in 10 seconds?

Tcecarenko [31]

Answer:

the power used by the person is 10 W.

Explanation:

Given;

weight lifted, W = 50 N

distance through which the weight was lifted, d = 2 m

time of motion, t = 10 s

The power used by the person is calculated as;

$P= FV\\\\P = F \ \times \ \frac{d}{t} \\\\P = 50 \ \times \ \frac{2}{10} \\\\P = 10 \ W$

Therefore, the power used by the person is 10 W.

3 0

3 years ago