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
yaroslaw [1]
3 years ago
15

Before heating a hot air balloon, the air temperature is 20C, and the density of air is 1 kg/m3. To launch the balloon, the burn

er is lit, and the air temperature inside the balloon is raised to 30C. What is the air density in the balloon now?
Physics
2 answers:
yuradex [85]3 years ago
7 0

Answer:

p_2 = 0.967 kg/m^3

Explanation:

Given:

- Initial Temperature T_1 = 20 C

- Final Temperature T_2 = 30 C

- Initial Density of air p_1 = 1 kg/m^3

Find:

The Density of air after heating.

Solution:

- The air can be idealized and expressed using Ideal Gas Law as follows:

                                         P = p*R*T

Where,

P = Absolute pressure

R = Gas constant for air

T = Absolute Temperature

- We know that the pressure P of the air remains constant at 1 atm.

                                        P_1 / R = P_2/R

                                     p_1*T_1 = p_2*T_2

                                     p_2 = p_1 * (T_1 / T_2)

Plug in the values:

                                     p_2 = 1 * (20+273 / 30+273)

                                     p_2 = 0.967 kg/m^3

Mrrafil [7]3 years ago
4 0

Answer:

Explanation:

  • density and temperature have an inverse relationship between them.
  • initial density = 1 kg/m3
  • initial temperature = 20C = 293k
  • final temperature = 30C = 303k
  • final density = ?

ρT = K

ρ1T1 = ρ2T2

ρ2 = ρ1T1/T2

= 1 X 293 /303

= air density in the balloon now = 0.967kg/m3

You might be interested in
Giving a test to a group of students, the grades and gender are summarized belowGrades vs. Gender ABCMale10316Female465If one st
strojnjashka [21]

Answer:

20.45%

Explanation:

The probability that the student got a B is

\frac{total\#of\text{ students that got B}}{\text{total students }}\times100\%

Now, how many students are there in total?

The answer is

10+3+16+4+6+5=44\; \text{students}

How many students got a B?

The answer is

3+6=9\; \text{students}

therefore, the probability that the student has got a B is

\frac{9\text{ students }}{44\text{ students }}\times100\%=20.45\%

Hence, the probability that a student has got a B is 20.45%

5 0
1 year ago
every computer consists of physical components and non physical components the non physical component of a computer that underst
sp2606 [1]

Answer:

C. software

Explanation:

software, is a collection of data or computer instructions that tell the computer how to work. This is in contrast to physical hardware, from which the system is built and actually performs the work.

4 0
3 years ago
4. The blades on a fan have a frequency of 15 Hz.
vichka [17]

Answer:

a) 4500 cycles b) 0.0667s c) 6.67s

Explanation:

a) 15 Hz= 15 cycles/ s

   5 mins= 300s

   15 cycles/s * 300s= 4500 cycles

b) Period= 1/ frequency

   Period= 1/ 15 cycles/s

   Period= 0.0667s

c) Period * number of revolutions= time

  0.0667 * 100= 6.67s

6 0
3 years ago
what is the angular speed w of the system immediately after the collision in terms f the sstem parameters and I
denis23 [38]

Answer: hello some part of your question is missing attached below is the missing detail

answer :

<em>w</em>f = M( v cos∅ )D / I

Explanation:

The Angular speed <em>wf  </em>of the system after collision in terms of the system parameters  and I can be expressed as

considering angular momentum conservation

Li = Lf

M( v cos∅ ) D = ( ML^2 / 3  + mD^2 ) <em>w</em>f

where ;  ( ML^2 / 3  + mD^2 ) = I ( Inertia )

In terms of system parameters and I

<em>w</em>f = M( v cos∅ )D / I

5 0
2 years ago
A child uses a rubber band to launch a bottle cap at an angle of 37.0° above the horizontal. The cap travels a horizontal distan
zavuch27 [327]

Answer:

Initial velocity will be 1.356 m/sec      

Explanation:

Let the initial speed = u

Angle at which rubber band is launched = 37°

Horizontal component of initial velocity u_x=ucos\Theta =ucos37^{\circ}=0.7986u

Time is given as t = 1.20 sec

Distance in horizontal direction = 1.30 m

We know that distance = speed × time

So time t=\frac{distance}{speed}

1.20=\frac{1.3}{0.7986u}

u=1.356m/sec

So initial velocity will be 1.356 m/sec

3 0
2 years ago
Other questions:
  • 30 points please help a girl out! 
    12·1 answer
  • Find the angle between forces of 41 pounds and 68 pounds given a magnitude of 87 pounds for the resultant force. (Hint: Write fo
    6·1 answer
  • A plane travels 27,000 meters in 90 seconds. What was its speed?
    11·2 answers
  • which of the seasons is celebrated by many northern cultures with festivals, often symbolizing rebirth?
    12·2 answers
  • What is the momentum of a 20 kg object traveling at a rate of 5 m/s
    15·1 answer
  • Please Help!!!
    11·2 answers
  • True or false: objects fall toward earth at a rate of 9.8 m/s because of centripetal force.
    6·1 answer
  • What equation relates mechanical energy, thermal energy, and total energy when there is friction present in a system?
    11·1 answer
  • An object of mass M is placed on a disk that can rotate. One end of a string is tied to the object while the other end of the st
    10·2 answers
  • If you subtract vector 3.7 cm at 45° North of East from vector 4.5 cm at 57° West of North using a scale drawing, what is the re
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!