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3 years ago

Protons have a positive charge A.True B.False

Physics

2 answers:

PIT_PIT [208]3 years ago

5 0

Answer:

TRUE

Explanation:

Protons have a positive charge. Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge.

hram777 [196]3 years ago

4 0

Answer:

The answer is A) True. See the explanation below, please

Explanation:

A positively charged subatomic particle within the atomic nucleus is called a proton. The number of protons is given by the atomic number of an element (which is displayed in the periodic table).

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What would be the atomic number of an atom that is composed of 15 protons and 18 neutron

Inessa [10]

Answer:

As the atomic number is equal to number of protons in an atom , so the atom having 15 electons has atomic number 15.

Explanation:

7 0

3 years ago

A stream of warm air with a dry-bulb temperature of 36°C and a wet-bulb temperature of 30°C is mixed adiabatically with a stream

rewona [7]

Answer:

Explanation:

Given

$T_1\left ( DBT\right )=36^{\circ}C$

$WBT=30^{\circ}C$

$m_1=8 kg/s$

$m_2=10 kg/s$

Now total mass $m_3=sum of m_1+m_2$

$m_3=8+10=18 kg/sec$

Now from Steam table at DBT= $36^{\circ}C & WBT=30^{\circ}C$

$\omega _1=0.025$ kg\kg of dry air

for saturated cool air at $12^{\circ}C$

Humidity ratio $\omega _2=0.0085$ kg\kg of dry air

Now

$m_1\omega _1+m_2\omega _2=m_3\omega _3$

$8\cdot 0.025+10\cdot 0.0085=18\cdot \omega _3$

$\omega _3=0.01585$ kg/kg of dry air

Now

$m_1h_1+m_2h_2=m_3h_3$

$m_1C_pT_1+m_2C_pT_2=m_3C_pT_3$

$m_1T_1+m_2T_2=m_3T_3$

$8\cdot 36+10\cdot 12=18\cdot T_3$

$T_3=22.67^{\circ}C$

From Psychometric chart

$at t=22.67^{\circ}C & \omega _3=0.01585$ kg/kg of dry air

relative humidity ratio $\phi =0.89 or 89\%$

6 0

3 years ago

What has a higher eccentricity - a planet or a comet?

Daniel [21]

Answer:

comet

Explanation:

hope it helps

7 0

2 years ago

the pitch that the average human can hear has a frequency of 20.0. If sound with this frequency travels through air with the spe

Natalka [10]

There are problems with the first sentence, and it's not really needed when
working with this question. So let's just take the 20 (Hz ?) frequency from
the first sentence, and ignore the rest of it for right now.

Wavelength = (speed) / (frequency) =

(331 m/s) / (20 Hz) = <em>16.55 meters</em>.

8 0

3 years ago

A rogue band of colonists on the moon declares war and prepares to use a catapult to launch large boulders at the earth. Assume

insens350 [35]

Answer:

2.3 km/s
11 km/s

Explanation:

The system is made up of three body system which are the boulder, earth and the moon also the sum of potential ad kinetic energies are assumed to be the same also note that the boulder was launched from the moon at an initial velocity

A ) Minimum speed of the boulder for it to reach the earth = 2.3 km/s

B) ignoring air resistance the impact speed on earth of a boulder launched at this minimum speed = 11 km/s

find attached the solution in details

4 0

3 years ago