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4 years ago

I WILL GIVE BRAINLIEST 50!!!!!

2 answers:

8 0

Convection is the movement of denser (cooler) materials falling and less dense (hotter) materials rising. This creates a cycle because the materials usually then heat up or cool, which restarts the movement again. Therefore, convection would be the transfer of heat through the movement of particles.

Inessa05 [86]4 years ago

4 0

Transfer of heat through objects touching source

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At 10:30 AM, detectives discover a dead body in a room and measure its temperature at 27°C. One hour later, the body's temperatu

wolverine [178]

Answer:

The time of death was approximately 4 hours before 10:30 AM.

Explanation:

Temperature of the body when discovered by detective at 10:30 AM= 27°C

After discovery, Temperature of the body at 11.30 AM= 24.8°C

Change in time = ΔT = 1 hour

Rate of change of body temperature with respect to time :

$R=\frac{24.8^oC-27^oC}{1 hour}=-2.2^oC/hour$

Normal body temperature = 37°C

Change in time since death = ΔT'

$R=\frac{27^oC-37^oC}{\Delta T'}$

$-2.2^oC/hour=\frac{27^oC-37^oC}{\Delta T'}$

$\Delta T'=\frac{27^oC-37^oC}{-2.2^oC/Hour}=4.54 hour\approx 4 hours$

The time of death was approximately 4 hours before 10:30 AM.

4 0

4 years ago

Find the transformation matrix that rotates a rectangular coordinate system through an angle of 60 about axes equal angels with

RSB [31]

Answer:

$M = \left[\begin{array}{ccc}cos \ 60&0\\0&-sin \ 60\end{array}\right]$

Explanation:

To find the matrix, let's decompose the vectors, the rotated angle is (-60C) for the prime system

x ’= x cos (-60)

y ’= y sin (-60)

we use

cos 60 = cos (-60)

sin 60 = - sin (-60)

we substitute

x ’= x cos 60

y ’= - y sin 60

the transformation system is

$\left[\begin{array}{ccc}x'\\y'\end{array}\right] = \left[\begin{array}{ccc}cos 60&0\\0&-sin60\end{array}\right] \ \left[\begin{array}{ccc}x\\y\end{array}\right]$ x '

the transformation matrix is

$M = \left[\begin{array}{ccc}cos \ 60&0\\0&-sin \ 60\end{array}\right]$

4 0

3 years ago

From which direction does most bad weather arrive? east west magnetic north South Pole

Nutka1998 [239]

Answer:

most bad weather arrives from the west

Explanation:

At different latitudes, the Earth has conveyor belts of air which affect weather like the westerlies and the trade winds. North America is most influenced by the westerlies, which come from the west

5 0

3 years ago

Would the forces acting on the sky diver be balanced or unbalanced? Explain your answer.

docker41 [41]

Answer:

your mom is balanced!!!

4 0

3 years ago

HELP NOW PLEASE ANSWER THE QUESTION THE PICTURE IS ATTACHED BELOW

Andrej [43]

Answer:

Explanation:

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7 0

3 years ago