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jok3333 [9.3K]
3 years ago
14

Barometers have long been used to predict the weather. Jay and Jeff were responsible for recording the class weather data each d

ay in March. One day, they noticed that there was a rapid change in the barometric pressure. The barometric pressure dropped down very, very quickly. What type of weather could Jay and Jeff expect soon? A) fog B) rain C) clearing D) drop in temperature
Physics
2 answers:
g100num [7]3 years ago
7 0

Answer:

B) rain

Explanation:

The barometer is a device that is used to measure atmospheric pressure and, consequently, the height at which someone rises, as well as to approximately predict atmospheric changes. Thus, a rising barometer indicates an increase in air pressure, whereas a falling barometer indicates a decrease in air pressure.

In environments with low atmospheric pressure and, therefore, heat, the heated air tends to rise and, when reaching higher altitudes, condenses, forms clouds and precipitates. In this situation, the barometric pressure drops very, very quickly, indicating that a rain is coming.

AfilCa [17]3 years ago
4 0

Answer:

B

Explanation:

You would have rain. You would have clouds, precipitation, and strong winds.

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The pressure exerted by a phonograph needle on a record is surprisingly large, due to the very small width of the needle. If the
Alex

Answer:

102597.6 Pa

Explanation:

mass, m = 1.25 g

Force, F = m x g = 1.25 x 9.8 x 10^-3 = 0.01225 N

radius, r = 0.195 mm = 0.195 x 10^-3 m

Area, A = πr² = 3.14 x 0.195 x 0.195 x 10^-6 m^2

A = 1.19 x 10^-7 m^2

Pressure is defined as the thrust acting per unit area.

P = Force / Area

P = 0.01225 N / (1.10 x 10^-7)

P = 102597.6 Pa

Thus, the pressure exerted is 102597.6 Pa.

6 0
3 years ago
Calculate the amount of heat (in kj) required to convert 74.6 g of water to steam at 100°c
Kryger [21]
You just need the energy of turning of water in to steam. Water is a little funny because once water gets to 100 degrees C, it stops changing in temperature whilst it all turns to steam. The amount of energy required to turn 1 gram of water into steam is 2257 Joules. We call this the latent heat of vaporisation. So to turn 74.6 grams of water to steam, you would need:

2257J/gram x 74.6g = 168,372.2 J = 168.4 kJ

(<span></span><em>latent heat of vaporisation: 2257 J/gram</em>)


7 0
3 years ago
An airplane that travels 550 mph in still air encounters a 50​-mph headwind. how long will it take the plane to travel 1250 mi i
Natali [406]

As the headwind comes at the head of the plane, therefore 50 mph headwind slows the plane down.

Thus actual speed of plane with headwind, v=550- 50=500 mph

Now using the formula , velocity= \frac{distance}{time}

 500 mph = \frac{1250 mile}{time}

time = \frac{1250 mil}{500 mph}

time = 2.5 hour

Hence plane will take time to complete the distance 1250 mile in 2.5 hours

5 0
3 years ago
A thundercloud has an electric charge of 48.8 C near the top of the cloud and –41.7 C near the bottom of the cloud. The magnitud
IceJOKER [234]

Answer: 1.51 km

Explanation:

<u>Coulomb's Law:</u> The electrostatic force between two charge particles Q: and Q2 is directly proportional to product of magnitude of charges and inversely proportional to square of separation distance between them.

Or,   \vec{F}=k \frac{Q_{1} Q_{2}}{r^{2}}

Where Q1 and Q2 are magnitude of two charges and r is distance between them:

<u>Given:</u>

Q1 = Charge near top of cloud = 48.8 C

Q2 = Charge near the bottom of cloud = -41.7 C

Force between charge at top and bottom of cloud (i.e. between Q: and Q2) (F) = 7.98 x 10^6N

k = 8.99 x 109Nm^2/C^2

<u>So,</u>

\begin{aligned}&7.98 \times 10^{6}=\left(8.99 \times 10^{9} \mathrm{Nm}^{2} / \mathrm{C}^{2}\right) \frac{48.8 \mathrm{C} \times 41.7 \mathrm{C}}{\mathrm{r}^{2}} \\&r=\sqrt{\frac{1.8294 \times 10^{13}}{7.98 \times 10^{6}}}=1.514  \times 10^{3} \mathrm{~m}=1.51 \mathrm{~km}\end{aligned}

Therefore, the separation between the two charges (r) = 1.51 km

3 0
2 years ago
Thunderclouds and storms come from which type of front?
alekssr [168]

Answer:

I believe it's A. Cold Front.

Hope this helps, Mark as brainiest please. :-)

3 0
3 years ago
Read 2 more answers
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