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3 years ago

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

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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.

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