1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Marizza181 [45]
3 years ago
11

you hold a mug of hot chocolate to warm your hands. Which type of heat transfer are you demonstrating?

Physics
2 answers:
olasank [31]3 years ago
7 0

Explanation:

Conduction is the transfer of heat through direct contact. Whereas convection is the transfer of heat through the currents which generate by warming or cooling of liquids or gases.

On the other hand, radiation is the direct transfer of electromagnetic waves in the form of heat through the space.

Therefore, when you hold a mug of hot chocolate to warm your hands then due to the direct contact with the mug your hands get warmer.

Hence, this transfer of heat is through the process of conduction.

Sergio [31]3 years ago
6 0
<span>Some flows into your hands by conduction, some is lost to the surrounding air by convection</span>
You might be interested in
Two radio antennas are 120 m apart on a north-south line, and they radiate in phase at a frequency of 3.4 MHz. All radio measure
chubhunter [2.5K]

Answer:

the smallest angle from the antennas is <em>47.3°</em>

Explanation:

We first need to write the expression for the relation between the wavelength (λ) and the frequency (f) of the wave, and then solve for the wavelength.

Therefore, the relation is:

λ = c /f

where

  • c is the speed of light constant
  • λ is the wavelength
  • f is the frequency

Thus,

λ = (3 × 10⁸ m/s) / (3.4 MHz)

  = (3 × 10⁸ m/s) / (3.4 MHz)(10⁶ Hz/1 MHz)

  = 88.235 m

Therefore, the smallest angle measured (from the north of east) from the antennas for the constructive interference of the two-radio wave can be calculated as

θ = sin⁻¹(λ / d)

where

  • d is the distance between the two radio antennas

Thus,

θ = sin⁻¹(88.235 / 120)

<em>θ = 47.3 °</em>

<em></em>

Therefore, the smallest angle from the antennas, measured north of east, at which constructive interference of two radio waves occurs is <em>47.3 °</em>.

5 0
3 years ago
What is the Momentum of a ball that has a mass of 0.5 kg and a velocity of 20 m/s?
Zarrin [17]
P (momentum) = mass x velocity
p = .5 x 20
p = 10
8 0
2 years ago
You set a tuning fork into vibration at a frequency of 723 Hz and then drop it off the roof of the Physics building where the ac
zaharov [31]

Answer:

Explanation:

Given

Original Frequency f=723\ Hz

apparent Frequency f'=697\ Hz

There is change in frequency whenever source move relative to the observer.

From Doppler effect we can write as

f'=f\cdot \frac{v-v_o}{v+v_s}

where  

f'=apparent frequency  

v=velocity of sound in the given media

v_s=velocity of source

v_0=velocity of observer  

here v_0=0

697=723\cdot (\frac{343-0}{343+v_s})

v_s=(\frac{f}{f'}-1)v

v_s=(\frac{723}{697}-1)\cdot 343

v_s=12.79\approx 12.8\ m/s

i.e.fork acquired a velocity of 12.8 m/s

distance traveled by fork is given by

v^2-u^2=2as

where v=final velocity

u=initial velocity

a=acceleration

s=displacement

v_s^2-0=2\times 9.8\times s

s=\frac{12.8^2}{2\times 9.8}

s=8.35\ m

                                       

5 0
3 years ago
A cart on an air track is moving at 0.5m/s when the air issuddenly turned off. THe cart comes to rest in 1m. The experimentis re
Licemer1 [7]

Answer:

D = 4 m

Explanation:

Speed of cart in air track v₁ = 0.5 m/s

Speed of cart moved when air is turned off v₂= 1 m/s

The distance travelled by the cart is d₁ = 1 m

Work done (W) = F x d

Work done is equal to the kinetic energy

F x d = 1/2mv²

velocity is directly proportional to distance

therefore,

v₁²/ v₂²  = d₁ / d₂

d₂ = d₁v₂² / v₁²

= 1 m x (1 m /s)² / (0.5 m/s)²

= 4 m

5 0
3 years ago
a _ is an explanation that unifies the findings of many experiments, and it can be changed when new experimental results need to
MakcuM [25]

That's a pretty good intuitive definition of a <em>theory </em>.

3 0
3 years ago
Read 2 more answers
Other questions:
  • A 40% pressure drop across an oil filter screen indicates that?
    9·1 answer
  • An arrow is launched upward with an initial speed of 100 meters per second (m/s). The equations above describe the constant-acce
    9·1 answer
  • A bowling ball has a mass of 5 kg. A student rolls the bowling ball one time at 1 m/s and a second time and 2 m/s. Compare the m
    7·1 answer
  • Careful measurements have been made of Olympic sprinters in the 100-meter dash. A quite realistic model is that the sprinter's v
    11·1 answer
  • A spherically spreading EM wave comes from an 1800-W source. At a distance of 5.0 m, what is the intensity, and what is the rms
    14·1 answer
  • when a body of mass 0.25kg is acted upon by a force, the velocity changes from 5m/s to 7.5m/s. Calculate the work done by the fo
    5·1 answer
  • A 0.060 kg ball hits the ground with a speed of –32 m/s. The ball is in contact with the ground for 45 milliseconds and the grou
    12·1 answer
  • Which of the following statements is true?
    6·1 answer
  • 7. A 1.0 kg metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained
    7·1 answer
  • S A voltage ΔV is applied to a series configuration of n resistors, each of resistance R. The circuit components are reconnected
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!