All categories

3 years ago

An insulated lunch bag keeps food warm by

Physics

2 answers:

Greeley [361]3 years ago

8 0

Answer: slowing the transfer of thermal energy from the food inside the bag to the air outside the bag.

Hatshy [7]3 years ago

4 0

I believe the answer is D

You might be interested in

A disk with a radius of R is oriented with its normal unit vector at an angle Q with respect to a uniform electric field. Which

beks73 [17]

As we know that electric flux is given by

$\phi = E.A$

$\phi = EAcos\theta$

so in order to increase the flux we have two options

1. By increasing the area of the disc

2. by changing the orientation of disc so the area of the disc is parallel to the electric field

so correct answer will be

<em> A. increasing the area of the disk</em>

7 0

3 years ago

Please please help me please please

Scorpion4ik [409]

Answer:

Explanation:

PO NG SAGOT

<h2>#MARK BRAINLITS PO</h2>

TINUTULUNGAN KO PO KAYO

3 0

3 years ago

The heat flux for a given wall is in the x-direction and given as q^n = 11 W/m^2, the walls thermal conductivity is 1.7 W/mK and

MrMuchimi

Answer:

$\frac{dT}{dx} = 6.47 ^oC/m$

Also as we can see the equation that heat flux directly depends on the temperature gradient so more is the temperature gradient then more will be the heat flux.

For positive temperature gradient the heat will flow outwards while for negative temperature gradient the heat will flow inwards

Explanation:

As we know that heat flux is given by the formula

$q^n = K\frac{dT}{dx}$

here we know that

K = thermal conductivity

$\frac{dT}{dx}$ = temperature gradient

now we know that

$q^n = 11 W/m^2$

also we know that

K = 1.7 W/mK

now we have

$11 = 1.7 \frac{dT}{dx}$

so temperature gradient is given as

$\frac{dT}{dx} = \frac{11}{1.7} = 6.47 K/m$

also in other unit it will be same

$\frac{dT}{dx} = 6.47 ^oC/m$

Also as we can see the equation that heat flux directly depends on the temperature gradient so more is the temperature gradient then more will be the heat flux.

For positive temperature gradient the heat will flow outwards while for negative temperature gradient the heat will flow inwards

5 0

3 years ago

What are the dimensions of potential energy?

Pachacha [2.7K]

Potential Energy (P.E) = Mass x

Acceleration due to Gravity x Altitude. Putting this value in the above equation we get, Dimensional Formula of

Potential energy= M1L2T-2.

5 0

3 years ago

. Explain how surface waves can have characteristics of both longitudinal waves and transverse waves.

Annette [7]

Answer:

This whole concept depends on the depends on the direction of propagation of the surface wave or displacement of wave such that if its in direction of wave velocity its said to features of longitudinal wave and if its in direction at 90° to wave velocity its said to have transverse features

5 0

3 years ago