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
Zinaida [17]
3 years ago
5

When the air under the envelope is heated, the balloon lifts. Which of the following statements is true? A) hot air balloons use

radiation to rise B) hot air balloons use conduction to rise C) hot air balloons use convection to rise D) hot air balloons use air resistance to rise
Physics
2 answers:
Bond [772]3 years ago
4 0

The hot air balloon uses convection to rise

butalik [34]3 years ago
3 0

C) hot air balloons use convection to rise

when air under the envelope is heated, it  travels upward and it is less dense as compared to the air in the surrounding . This difference in density values of air inside and outside creates force of buoyancy which make the balloon to get lifted. since here the air is being heated and it is transporting the thermal energy with it, this process is called convection. hence we say that hot air balloons use convection to rise.

You might be interested in
How can resonance overcome damping of an oscillating system? ​
Aneli [31]

Answer:

When one system vibrating at its natural frequency is put closer to a stationary system, the stationary system receives impulses.

At resonant frequency, the system vibrating at its own natural frequency suddenly goes on decreasing in order to cope with neighboring system.

These decrease in frequency is known as damping.

6 0
3 years ago
What do you know about tides?
Neporo4naja [7]

Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun, and the rotation of the Earth. Tide tables can be used to find the predicted times and amplitude (or "tidal range") of tides at any given locale.

For further expiation please contact me at 678-987-2411. Disclaimer(This is not a real number)

8 0
3 years ago
What is displacement?​
ycow [4]

Answer:

Change in position of an object A vector quantity with unit of distance.

Explanation:

Where is the object going? Final - initial

5 0
3 years ago
A stuntwoman is going to attempt a jump across a canyon that is 77 m wide. The ramp on the far side of the canyon is 25 m lower
liq [111]

initial speed of the stuntman is given as

v = 28 m/s

angle of inclination is given as

\theta = 15 degree

now the components of the velocity is given as

v_x = 28 cos15 = 27.04 m/s

v_y = 28 sin15 = 7.25 m/s

here it is given that the ramp on the far side of the canyon is 25 m lower than the ramp from which she will leave.

So the displacement in vertical direction is given as

\delta y = -25 m

\delta y = v_y * t + \frac{1}{2} at^2

-25 = 7.25 * t - \frac{1}{2}*9.8* t^2

by solving above equation we have

t = 3.12 s

Now in the above interval of time the horizontal distance moved by it is given by

d_x = v_x * t

d_x = 27.04 * 3.12 = 84.4 m

since the canyon width is 77 m which is less than the horizontal distance covered by the stuntman so here we can say that stuntman will cross the canyon.

5 0
3 years ago
Stacy set up three vials on a hot plate. He poured the same amount of liquid
tensa zangetsu [6.8K]
A because he is putting three vitals on a hot plate
4 0
3 years ago
Read 2 more answers
Other questions:
  • A baseball is hit nearly straight up into the air with a speed of 22 m/s. (a) how high does it go ?
    10·1 answer
  • On the moon, what would be the force of gravity acting on an object that has a mass of 7kg?
    15·1 answer
  • There are three states of ………….
    6·1 answer
  • How do the wavelength and frequency of red light compare to the wavelength and frequency of blue light?
    6·1 answer
  • What force works against friction? <br> Inertia<br> Potential <br> Kinetic
    10·2 answers
  • What is the period of motion of an hour hand on a clock face
    11·1 answer
  • If the maximum moment of force on a door is 10 Nm by an applied force of 2.25 N, then the distance of handle
    6·1 answer
  • Find the scaler product of this two vector
    7·1 answer
  • How many carbon atoms placed end to end would equal the width of a human hair
    12·1 answer
  • Jose was out drinking with his friends for nearly the whole night. The next morning he was confused and vomiting, and had a low
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!