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
morpeh [17]
3 years ago
5

A beam of hydrogen molecules (h2) is directed toward a wall, at an angle of 55 with the normal to the wall. each molecule in the

beam has a speed of 1.0 km/s and a mass of 3.3 1024 g.the beam strikes the wall over an area of 2.0 cm2, at the rate of 1023 molecules per second.what is the beam’s pressure on the wall?
Physics
1 answer:
cestrela7 [59]3 years ago
8 0

 

The change in momentum of the particle upon hitting the wall is expressed as:

Change in momentum = Δp = 2 m v cosθ

where m = 3.3E-24 g = 3.3E-27 kg, v = 1.0 km/s = 1000 m/s, θ = 55°

 

Dividing both sides by Δt:

Δp / Δt = 2 (Δm / Δt) v cosθ

 

By definition, the force applied to a particle is equal to the change in momentum per second of the particle (by Newton's Second Law). Therefore:

Force on wall = Δp / Δt = 2 (Δm / Δt) v cosθ

 

We can get or calculate the value of  (Δm / Δt) from the given data. That is:

Δm / Δt = m * particles per second = (3.3E-27 kg/particle) (1023 particle/s)

Δm / Δt = 3.3759 E-24 kg/s

 

Therefore the force is:

Total force on wall = 2 (3.3759 E-24 kg/s) (1000 m/s) cos(55)

Total Force on wall = 1.494E-22 N

 

Pressure = Total Force / Area = 1.494E-22 N / 2.0E-4 m^2

Pressure = 7.47E-19  Pascals

 

Therefore the pressure is 7.47*10^-19 Pa.

You might be interested in
What is the objective lens?
Monica [59]

Answer:

The objective lens is an optical tool used to focus an image.

Explanation:

The objective lens is an optical tool that collects light emitted by an object under observation and focuses the  rays of light in order to form a real and magnified image  They are used in optical instruments like microscopes, cameras, telescopes, etc. and are also referred as objective or object glasses.

5 0
3 years ago
Which of Newton's laws explains why satellites need very little fuel to stay in oribit?
Angelina_Jolie [31]

Sattelites don't need any fuel to stay in orbit. The applicable law is...."objects in motion tend to stay in motion". Having reached orbital velocity, any such object is essentially "falling" around the earth. Since there is no (or at least very little) friction in the vacuum of space, the object does not slow.... It simply continues.


Sattelites in "low" earth orbit do encounter some friction from the very thin upper atmosphere, and they will eventually "decay".

:)

4 0
3 years ago
What is the energy of the photon emitted when an electron in a mercury atom drops from energy level f to energy level b?
xeze [42]

The energy of the photon emitted when an electron in a mercury atom drops from energy level f to energy level b is 3.06 eV.

<h3>Change in energy level of the electron</h3>

When photons jump from a higher energy level to a lower level, they emit or radiate energy.

The change in energy level of the electrons is calculated as follows;

ΔE = Eb - Ef

ΔE = -2.68 eV - (-5.74 eV)

ΔE = 3.06 eV

Thus, the energy of the photon emitted when an electron in a mercury atom drops from energy level f to energy level b is 3.06 eV.

Learn more about energy level here: brainly.com/question/14287666

#SPJ1

7 0
2 years ago
Select all the correct answers.
myrzilka [38]

<em>Anything</em> that's dropped through air is somewhat affected by air resistance.  But, out of that list, the leaf and the balloon are the items that will be affected by air resistance enough so that you can plainly see it.

If you spend some time thinking about it, you can kind of understand why airplane wings and boat propellers are shaped more like leafs and balloons than like bricks and rocks.

3 0
3 years ago
A spacecraft is moving past the earth at a constant speed of 0.60 times the speed of light. The astronaut measures the time inte
Afina-wow [57]

Answer:

the time interval that an earth observer measures is 4 seconds

Explanation:

Given the data in the question;

speed of the spacecraft as it moves past the is 0.6 times the speed of light

we know that speed of light c = 3 × 10⁸ m/s

so speed of spacecraft v = 0.6 × c = 0.6c

time interval between ticks of the spacecraft clock Δt₀ = 3.2 seconds

Now, from time dilation;

t = Δt₀ / √( 1 - ( v² / c² ) )

t = Δt₀ / √( 1 - ( v/c )² )

we substitute

t = 3.2 / √( 1 - ( 0.6c / c )² )

t = 3.2 / √( 1 - ( 0.6 )² )

t = 3.2 / √( 1 - 0.36 )

t = 3.2 / √0.64

t = 3.2 / 0.8

t = 4 seconds

Therefore, the time interval that an earth observer measures is 4 seconds

6 0
3 years ago
Other questions:
  • Match the words in the left-hand column to the appropriate blank in the sentences in the right-hand column. use each word only o
    11·1 answer
  • All vehicles are required to stop within how many feet of a railroad crossing when a train is approaching
    6·1 answer
  • Cars A and B are racing each other along the same straight road in the following manner:
    10·1 answer
  • A cycler leaves home and rides due south for 65 km. She returns home on the same road. What is the cycler's
    15·1 answer
  • Margaret is the new director of research at a well-known pharmaceutical company. She has been asked to design a set of research
    5·1 answer
  • Carl knows that water moves through different kinds of soil at different rates. How easily water moves through a soil is known a
    10·1 answer
  • Can someone pls help me with this problem???
    7·1 answer
  • (a) Calculate the height (in m) of a cliff if it takes 2.48 s for a rock to hit the ground when it is thrown straight up from th
    9·1 answer
  • Qué es el movimiento
    11·2 answers
  • When a person is exhibiting suppression, the forgetting that takes place is
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!