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SashulF [63]
3 years ago
8

In nature, hot air tends to rise and cool air tends to sink. This is behind the concept of convection heating that is used in ov

ens. Convection currents occur only in fluids such as liquids and gases but not in solids.
Which of the examples below is an example of convection?
A) rubbing your hands together.
B) heating a fish tank.
C) basking in the sun.
D) striking a match.
Physics
2 answers:
Nataly_w [17]3 years ago
7 0
Answer: Heating a fish tank
drek231 [11]3 years ago
6 0

Answer:

<h2>B</h2>

Explanation:

MODES OF HEAT TRANSFER

1) Conduction: This type of heat transfer happens when there is direct contact between the two object.

2) Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas).

3) Radiation: This type of heat transfer happens when there is direct transfer of energy through space.

A. Rubbing your hands together, is a type of energy transformation in which mechanical energy transforms to heat energy.

<h3>B. Heating a fish tank: Hot liquid tends to rise and cool liquid tends to sink and thus the fish tank heats.</h3>

C. Basking in the sun: is a type of radiation as the sun energy is transferred through space.

D. Striking a match: is a energy transformation in which mechanical energy transforms to heat and light energy.

please make me brainlist

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sineoko [7]

Answer:

Reflection is when light bounces off an object, while refraction is when light bends while passing through an object.

Explanation:

I just learned about this 2 weeks ago actually.

5 0
3 years ago
In order to rendezvous with an asteroid passing close to the earth, a spacecraft must be moving at 8.50×103m/s relative to the e
Mariulka [41]

Answer:

v₀ = 13.9 10³ m / s

Explanation:

Let's analyze this exercise we can use the basic kinematics relationships to love the initial velocity and the acceleration we can look for from Newton's second law where force is gravitational attraction.

    F = m a

    G m M / x² = m dv / dt = m dv/dx  dx/dt

    G M / x² = dv/dx   v

    GM dx / x² = v dv

We integrate

    v² / 2 = GM (-1 / x)

We evaluate between the lower limits where x = Re = 6.37 10⁶m  and the velocity v = vo and the upper limit x = 2.50 10⁸m  with a velocity of v = 8.50 10³ m/s

    ½ ((8.5 10³)² - v₀²) = GM (-1 /(2.50 10⁸) + 1 / (6.37 10⁶))

    72.25 10⁶ - v₀² = 2 G M (+0.4 10⁻⁸ - 1.57 10⁻⁷)

    72.25 10⁶ - v₀² = 2 6.63 10⁻¹¹ 5.98 10²⁴ (-15.3  10⁻⁸)

    72.25 10⁶ - v₀² = -1.213  10⁸

    v₀² = 72.25 10⁶ + 1,213 10⁸

    v₀² = 193.6 10⁶

    v₀ = 13.9 10³ m / s

6 0
3 years ago
a farmer lifts a bale of hay that is 12m off the ground . If he uses a force of 350 n, how much work does the farmer do?
hjlf

Answer:

4200 Joules

Explanation:

Work done =force x distance

From the question , we’re given f =350N ,

d = 12m

Using the above formula, we have

Workdone = 350 x 12

= 4200 Joules

5 0
3 years ago
Which category of mechanical waves are produced during an earthquake?
andre [41]

Answer:

The answer is C. Seismic waves.

Explanation:

  • <u>Seismic waves are waves of energy that travel through Earth's layers, and are a result of earthquakes.</u>
3 0
2 years ago
What occurs during stage one sleep
Mekhanik [1.2K]

Answer:

Stage one of sleep, also known as the transitional phase, occurs when one finds themselves floating in and out of consciousness. During this NREM stage, you may be partially awake while your mind begins to drift off. This period of drowsiness eventually leads to a light sleep

Explanation:

i found it on google

3 0
3 years ago
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