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2 years ago

You place your hands over a steaming bowl of soup to warm them. Which type of heat transfer are you experiencing?

2 answers:

8 0

There could be a little bit of conduction through the air that's between the soup and your hand. But it's very small, because air is not a good conductor of heat.

It's mostly convection ... hot air and steam rising from the soup to your hand.

Then, of course, there HAS to be some conduction when the hot gases reach your hand ... their heat has to soak into your skin, and that's conduction.

xxTIMURxx [149]2 years ago

4 0

Answer: Convection

Explanation:

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Which of the following best describes an action-reaction pair? A. The Moon Pulls on Earth, and Earth pulls back on the moon. B.

Papessa [141]

An action-reaction pair would be a pair in which one of the elements exerts a force on the other element (action), and then the other element would respond to this force by exerting another force in the opposite direction (reaction).

From the given choices, we will see that:
For choice A, the moon exerts a force on the earth by pulling it (action) and the earth responds to this force by pulling the moon (reaction in opposite direction of the action).

Therefore, the correct choice would be:
A. The Moon Pulls on Earth, and Earth pulls back on the moon.

4 0

1 year ago

Read 2 more answers

A reflecting telescope is built with a 20-cm-diameter mirror having a 1.00 m focal length. it is used with a 10× eyepiece.

kondaur [170]

I really wish I could be helping you. I don't know.

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2 years ago

Suppose you look out the window of a skyscraper and see someone throw a tomato downward from above your window. your window is a

photoshop1234 [79]

Formula for height
 r(t) = a/2 t² + v₀ t + r₀
 where
 a = acceleration = -32 ft/sec² (gravity)
 v₀ = initial velocity
 r₀ = initial height
 r(t) = -16t² + v₀ t + r₀
 Tomato passes window (height = 450 ft) after 2 seconds:
 r(2) = 450
 -16(4) + v₀ (2) + r₀ = 450
 r₀ = 450 + 64 - 2v₀
 r₀ = 514 - 2v₀
 Tomato hits the ground (height = 0 ft) after 5 seconds:
 r(5) = 0
 -16(25) + v₀ (5) + r₀ = 0
 r₀ = 16(25) - 5v₀
 r₀ = 400 - 5v₀

r₀ = 514 - 2v₀ and r₀ = 400 - 5v₀
 514 - 2v₀ = 400 - 5v₀
 5v₀ - 2v₀ = 400 - 514
 3v₀ = −114
 v₀ = −38
 Initial velocity = −38 ft/sec (so tomato was thrown down)
 (initial height = 590 ft)

4 0

2 years ago

A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km.At the bottom of the dive, the pilot has a sp

Yuliya22 [10]

Answer:

Force plane exert on pilot = 4270 N

Explanation:

first convert radius and speed to ms

using formula from force we know that

mass = weight/ gravity = 700 N/ 9.8N/kg= 71.4 kg

Fc= N-mg

N= Fc+ mg As Fc = mv²/R

N= mv²/R + mg

taking m common

N= m( v²/R +g)

= 71.4( (200)²/ 800 + 9.8 )

Force = 4270 N

3 0

2 years ago

For a demonstration, a professor uses a razor blade to cut a thin slit in a piece of aluminum foil. When she shines a laser poin

nydimaria [60]

Answer:

The width of slide is 0.092 mm.

Explanation:

Given that,

Wave length = 680 nm

Distance between slit and screen D= 5.4 m

Distance of bright band 2y = 7.9 cm

$y =\dfrac{7.9}{2}$

$y=3.95\ cm$

We need to calculate the width of slide

Using formula of width

$d=\dfrac{\lambda D}{y}$

Where, d = width

D =Distance between slit and screen

y = Distance of bright band

Put the value into the formula

$d=\dfrac{680\times10^{-9}\times5.4}{3.95\times10^{-2}}$

$d=0.092\times10^{-3}\ m$

$d=0.092\ mm$

Hence, The width of slide is 0.092 mm.

4 0

1 year ago