All categories

3 years ago

If you hold your hand over a pot of boiling water, it feels hot. Explain how the boiling water is transforming heat to your hand

2 answers:

8 0

I don't no if this helps but the body heat from your hand causes the liquid to boil, which in turn makes the liquid evaporate, turning it to gas. The expanding gas pushes the liquid upwards and when you release your hand, equilibrium is re-established.

iragen [17]3 years ago

7 0

Answer:

Conduction

Explanation:

The boiling heat is transforming heat to my hand through conduction. Conduction is a mode of heat transfer which is the transfer of heat from one body to another without any actual movement of the bodies. It does not occur in vacuum.

In conduction, heat is transferred from a region of high temperature to a region of low temperature. This means that the temperature of the pot of boiling water is higher than that of the hand and as such heat will be transferred from the pot to the hand due to temperature gradient. Note that there is no need need for the bodies in question (pot and the hand) to move before the heat will be transferred.

You might be interested in

Can anyone else finish the parts?

almond37 [142]

Answer:

2. wavelength

3. Crest

4. Rest

5. Trough

6. Amplitude

Explanation:

8 0

3 years ago

A simple pendulum consists of a point mass suspended by a weightless, rigid wire in a uniform gravitation field. Which of the fo

alex41 [277]

Answer:

The period is proportional to the square root of the length of the wire.

The period is independent of the suspended mass.

Explanation:

The period of a simple pendulum, in the small angle oscillation approximation, is given by

$T=2\pi \sqrt{\frac{L}{g}}$

where

L is the length of the pendulum

g is the acceleration due to gravity

From the formula, we notice the following facts:

- The period is proportional to the square root of the length of the wire, L

- The period is independent of the suspended mass, m

So, these are the two correct statements.

6 0

3 years ago

An optical disk drive in your computer can spin a disk up to 10,000 rpm (about 1045 rad/s1045 rad/s ). If a particular disk is s

kumpel [21]

To solve this problem we must keep in mind the concepts related to angular kinematic equations. For which the angular velocity is defined as

$\omega_f =\omega_i-\alpha t$

Where

$\omega_f =$ Final angular velocity

$\omega_i =$ Initial angular velocity

$\alpha =$ Angular acceleration

t= time

In this case we do not have a final angular velocity, then

$\omega_i = \alpha t$

Re-arrange for $\alpha$

$\alpha= \frac{\omega_i}{t}$

$\alpha = \frac{910}{0.167}$

$\alpha = 5449.1 rad\s^2$

Therefore the mangitude of the angular aceleration is 5449.1rad/s²

6 0

4 years ago

How much heat would be needed to completely evaporate 31.5 g of boiling water at a temperature of 100 "C? Express your answer in

BaLLatris [955]

Answer:

Heat needed = 71.19 J

Explanation:

Here heat required can be calculated by the formula

H = mL

M is the mass of water and L is the latent heat of vaporization.

Mass of water, m = 31.5 g = 0.0315 kg

Latent heat of vaporization of water = 2260 kJ/kg

Substituting

H = mL = 0.0315 x 2260 = 71.19 kJ

Heat needed = 71.19 J

7 0

3 years ago

Given two vectors A⃗ =4.00i^+7.00j^ and B⃗ =5.00i^−2.00j^ , find the vector product A⃗ ×B⃗ (expressed in unit vectors).

Reptile [31]

Answer:

$-43\hat{k}$

Explanation:

given,

$\vec{A} = 4 \hat{i} + 7 \hat{j}$

$\vec{B} = 5 \hat{i} - 2 \hat{j}$

vector product $\vec{A} \times \vec{B} = ?$

$\vec{A} \times \vec{B}$ = $\begin{bmatrix}i & j & k\\ 4 & 7 &0 \\ 5 & -2 & 0\end{bmatrix}$

now, expanding the vector

$\vec{A} \times \vec{B}= \hat{k}(-2\times 4 - 7\times 5)$

$\vec{A} \times \vec{B}= -43\hat{k}$

the vector product is equal to $-43\hat{k}$

4 0

4 years ago