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3 years ago

Please help me with this

Physics

1 answer:

Kipish [7]3 years ago

5 0

Answer:

a i. The higher curve is "thick wall" and the lower curve is "thin wall".

a ii. The thicker the wall, the more time it takes to transfer the same amount of heat. Thus, the thick wall would have a less steep drop in temperature as it transferred lesser heat from the room to the surroundings and the thinner wall would have a steeper drop in temperature as it conducted more heat away from the room to the surroundings.

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A uniform disk is constrained to rotate about an axis passing through its center and perpendicular to the plane of the disk. If

katrin2010 [14]

A uniform disk is constrained to rotate about an axis passing through its center and perpendicular to the plane of the disk. If the disk starts from rest and is then brought in contact with a spinning rubber wheel, we observe that the disk gradually begins to rotate too. If after 35 s of contact with this spinning rubber wheel, the disk has an angular velocity of 4.0 rad/s, find the average angular acceleration that the disk experiences. (Assume the positive direction is in the initial direction of rotation of the disk. Indicate the direction with the sign of your answer.)

Assume after 35 s of contact with this spinning rubber wheel, the disk has an angular velocity of 11.0 rad/s.

Answer:

385 rad

Explanation:

The expression for the angular acceleration of a disk that is in contact with a spinning wheel can be given as:

$\alpha = \frac{\delta \omega}{\delta t}$

where $\delta\omega$ = $\omega_f - \omega_i$

$\alpha = \frac{ \omega_f-\omega_i}{\delta t}$

$\alpha = \frac{ 4.0 rad/s-0 rad/s}{35}$

$\alpha =0.14 rad/s^2$

Angular displacement of a disk can be calculated by using the formula:

$\theta = \omega t$

substituting 11.0 rad/s for $\omega$ and t = 35 s ; we have:

$\theta = 11.0 rad/s * 35 s$

$\theta = 385 rad$

4 0

3 years ago

Read 2 more answers

Two differences between science activities carried out in a science laboratory and those carried out side of science laboratory.

viva [34]

In a science lab, there is the adequate availability of raw materials for experiments such as chemicals while outside a science lab there isn't.

In a science lab, the availability of apparatuses and sources of heat is higher than outside a science lab.

<h3>What is science laboratory?</h3>

The science lab is a place where the experiments related to the science background are performed with the use of apparatus.

The science lab has plenty of equipment to perform the experiment whether related to physics or chemistry or biology.

Thus, source of heat and availability of raw material and equipment are the differences between the science activities carried out in a science laboratory and those carried out side of science laboratory.

Learn more about science laboratory.

brainly.com/question/7412101

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8 0

2 years ago

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Convection currents affect the movement of plates on the Earth’s crust. True or false.

GREYUIT [131]

True

I hope this helps and have a wonderful day filled with joy!!

8 0

3 years ago

The acceleration of an object (in m/s2) is given by the function a ( t ) = 6 sin ( t ) a(t)=6sin(t). The initial velocity of the

levacccp [35]

Answer:

$v(t)=-6cos(t)+4$

Explanation:

We have acceleration given by

$a(t)=6sin(t)$

Velocity at t = 0

$v(0)=-2\ m/s$

Velocity is given by

$v(t)=\int a(t)dt\\\Rightarrow v(t)=\int 6sin(t)dt\\\Rightarrow v(t)=6\int sin(t)\\\Rightarrow v(t)=-6cost+C$

at t = 0

$-2=-6cos0+C\\\Rightarrow -2+6=C\\\Rightarrow C=4$

The equation will be

$\mathbf{v(t)=-6cos(t)+4}$

8 0

3 years ago

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List possible causes of fever and explain the benefits of fever

olga2289 [7]

Answer:

Fever or elevated body temperature might be caused by:

A virus.

A bacterial infection.

Heat exhaustion.

Certain inflammatory conditions such as rheumatoid arthritis — inflammation of the lining of your joints (synovium)

A malignant tumor.

Many illness-causing microbes do best at the body's normal temperature. A fever raises the temperature beyond which certain microbes need to reproduce. A fever also kicks your child's immune system into high gear, spurring the rapid production of bug-clobbering white blood cells.

Explanation:

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7 0

3 years ago