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olga55 [171]
3 years ago
15

Explain why a trapped gas in black box left in the sun will reach a higher temperature than the surroundings

Physics
1 answer:
AleksandrR [38]3 years ago
3 0

Answer:

because the gas within the black box will absorb more heat than that in the surrounding

Explanation:

this is because the black color has a tendency of absorbing heat

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A car speeds past a stationary police officer while traveling 135 km/h. the officer immediately begins pursuit at a constant acc
kykrilka [37]

(a) The time it takes for the police officer to catch up to the speeding car is determined as 0.31 s.

(b) The speed of the police officer  at the time he catches up to the driver is 136.8 km/h.

<h3>Time of motion of the police</h3>

The time taken for the police to catch up with the driver is calculated as follows;

v = at

where;

  • a is acceleration = 11.8 km/h/s, = 3.278 m/s²
  • v is velocity = 135 km/h = 37.5 m/s

t = v/a

t = 37.5/3.278

t = 11.4 seconds

(v1 - v2)t = ¹/₂at² --- (1)

(v1 - v2)t = v1²/2a --- (2)

From (1):

(v1 - 37.5)t = ¹/₂(3.278)t²

(v1 - 37.5)t = 1.639t²

v1 - 37.5 = 1.639t

v1 = 1.639t + 37.5  -----(3)

From (2):

(v1 - 37.5)t = v1²/(2 x 3.278)

(v1 - 37.5)t = 0.153 ----- (4)

solve 3 and 4;

(1.639t + 37.5 - 37.5)t = 0.153

1.639t² = 0.153

t² = 0.0933

t = 0.31 s

<h3>Speed of the police officer</h3>

v1 = 1.639(0.31) + 37.5 = 38 m/s = 136.8 km/h

Learn more about velocity here: brainly.com/question/4931057

#SPJ1

4 0
2 years ago
Write an article to explain the process that occurs when matter is heated, or cooled. How does matter change its physical state
enyata [817]

Answer:

when matter is heated or cooled it melts or freezes for at least the atoms do

Explanation:

for example take water when you heat it up the water molecules melt producing vapor water vapor and when you freeze it or cool it down it turns into liquid or turned into a solid by turning into ice. the three main properties of matter are gas liquid and solid and if we put water into these three different categories it turns into water vapor as gas liquid water as liquid and Ice as a solid

hope this helps

3 0
3 years ago
If the thermal energy of the system increases by 400 J, and 1,100 J of heat were added to the system, how much work did the syst
Luba_88 [7]

700 J is the work done by the system.

<u>Explanation:</u>

The first law of thermodynamics is that the change in internal energy of the system is equal to the net heat transfer to the system minus the complete work performed by the system.

                  \Delta \boldsymbol{U}=\boldsymbol{Q}-\boldsymbol{W}

Where,

∆U – Change in internal energy

Q – Heat transfer to the system

Q – Work done

Here,

<u>Given data:</u>

∆U - 400 J

Q - 1100 J

We need to the work done by the system (W)

By applying the given values in the above equation, we get

400 = 1100 - W

W = 1100 - 400 = 700 J

7 0
3 years ago
When a particle of charge q moves with a velocity v⃗ in a magnetic field B⃗ , the particle is acted upon by a force F⃗ exerted b
melomori [17]

Answer:

3.8\cdot 10^{-16}N

Explanation:

For a charged particle moving perpendicularly to a magnetic field, the magnitude of the force exerted on the particle is:

F=qvB

where

q is the magnitude of the charge of the particle

v is the velocity of the particle

B is the magnetic field strength

In this problem, we have

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

v=6.0\cdot 10^6 m/s is the velocity

B=4.0\cdot 10^{-4}T is the magnetic field

Substituting into the formula, we find the force:

F=(1.6\cdot 10^{-19} C)(6.0\cdot 10^6 m/s)(4.0\cdot 10^{-4}T)=3.8\cdot 10^{-16}N

8 0
4 years ago
The electric field at point P due to a point charge Q a distance R away has magnitude E. In order to double the magnitude of the
Zinaida [17]

Answer:

Option E, double the charge to 2, is the right answer.

Explanation:

Given the electric field at point = P

The point charge = Q

Distance =R

Magnitude = E

Due to a certain charge, the magnitude of the electric field at a point is defined as:

E = \frac{kQ}{r^2}

Here, we can see that E is proportionate to Q and 1/r^2

Hence, double the charge to 2 and at the same time reduce the distance to /2 will half the E

Therefore, doubling the charge will doubling E

So the answer is (e) is correct.

4 0
3 years ago
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