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
exis [7]
3 years ago
7

Whichiscorrect?(A)anopaqueobjectdoesnotallowlighttopassthroughit.(B)an

Physics
2 answers:
Murljashka [212]3 years ago
6 0

Answer:

A)anopaqueobjectdoesnotallowlighttopassthroughit.

Explanation:

Anuta_ua [19.1K]3 years ago
4 0

Answer:

option a is the correct

Explanation:

You might be interested in
Which actions are evidence that a chemical reaction has occurred? Select five options. a change in color the formation of a prec
vladimir1956 [14]

Answer:

A change in color

The formation of a precipitate

A clear liquid becoming cloudy

The formation of bubbles

The formation of smoke

Explanation:

A chemical reaction can be defined as the conversion of reactant into product. The process in which one or more than one substance is converted into one or many different substances.

There are some indications which can provide the evidence that chemical reaction has occurred.

A change in color of the substance, formation or smoke or bubbles. The formation of the precipitate and in case the substance becomes cloudy.

All these evidences show that chemical reaction has occurred.

8 0
3 years ago
The initial concentration of acid ha in solution is 0.39 m. if the ph of the solution at equilibrium is 0.76, what is the percen
Alexus [3.1K]

The percent ionization of the acid is 44.56%

<h3>How can we calculate the percent ionization of the acid?</h3>

To calculate the percent ionization of the acid we are using the formula,

The H⁺ ion concentration [H⁺] = C x,

where, we are given,

C= concentration of the acid.

=0.39 M

x= degree of dissociation of the acid.

And one more thing we are given that, the pH of the acid=0.76.

So from the above statement we can say that,

pH = - log [H⁺]

Or,0.76 = -log [H⁺]

Or, log [H⁺] = -0.76

Or, [H⁺] = antilog -0.76

Or,[H⁺]= 10^-0.76

Or,[H⁺]=0.1738.

Now from the above calculation we know, the H⁺ ion concentration= 0.1738 M.

Now we put the known values in the above equation,

[H+]= Cx

Or,0.1739= 0.39 x

Or, x= 0.4459

From the above calculation we can conclude that the percent Ionization of the acid= 0.4459 X 100= 44.59%≈45%

Learn more about Ionization:

brainly.com/question/1445179

#SPJ4

4 0
1 year ago
SUPPOSE THAT YOURE FACING A STRAIGHT CURRENT CARRYING CONDUCTOR, AND the current isfowing towards you. The lines of magnetic for
enot [183]
According to the right hand grip rule; if you point your right thumb in the direction of the current flow and curl your fingers around the current carrying conductor, the fingers will point in the direction of the circular magnetic field around the conductor. Therefore,if the the current carrying carrying conductor is held with the current flowing towards you, using right hand grip rule the lines of magnetic field will act towards a counterclockwise direction or anticlockwise direction.
7 0
3 years ago
Can anyone heelp me plzz plzz
Natali5045456 [20]
I think the answer is c) 1
Hope it helps and have a good day
4 0
3 years ago
How many slices of bread did each climber have to eat to compensate for the increase of the gravitational potential energy of th
ICE Princess25 [194]

Answer:

Each climber had to eat 72 slices of bread to compensate for the increase of the gravitational potential energy of the system climbers-Earth

Explanation:

Hi

One piece of bread releases about 1.0 \times 10^{6}J of energy in the body, but efficiency in converting the body's chemical energy into mechanical work is 9.5 %, so 1.0 \times 10^{6}J(9.5\%)=95\times 10^{3} J.

On the other hand, we need to calculate the total work to reach the top of Mt. Everest , so W=mgh=(79 Kg)(9.8 m/s^{2})(8850 m)=6.8 \times 10^{6}J

Finally, we have that \# slices=\frac{W}{Energy/Slice} =\frac{6.8 \times 10^{6}J}{95\times 10^{3} J} =72 \ slices \ of \ bread

8 0
3 years ago
Other questions:
  • A 2.60-m length of wire is held in an east–west direction and moves horizontally to the north with a speed of 0.360 m/s. The Ear
    14·1 answer
  • assume the chair is 70 kg, the woman is 58 kg, the baby is 9 kg. Identify the normal forces between all three objects
    11·1 answer
  • What is the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s?
    8·1 answer
  • Velocity is:
    7·1 answer
  • Calculate the pressure produced by a force of 1500 N acting on an area of 6 m​2​
    12·2 answers
  • A spring has a length of 0.270 m when a 0.300 kg mass hangs from it, and a length of 0.750 m when a 2.80 kg mass hangs from it.
    5·1 answer
  • Can someone help me
    14·1 answer
  • Ava runs track and field and is a long-distance runner. She has a big race coming up and needs to eat food that will provide her
    9·2 answers
  • According to the passage, why don’t sharks sink in the water?
    13·1 answer
  • What is the change in position relative to a reference point?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!