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
professor190 [17]
3 years ago
7

Please help!!!!! :)

Physics
2 answers:
kow [346]3 years ago
5 0
The answer is A because bases are greater than 7 and acids are lower than 7
Jlenok [28]3 years ago
4 0
What's up ? ! ?  You should know most of these.

RbOH is a base because its PH is greater than 7.

Sulfur trioxide is SO₃ .

Mixtures B, C, and D can be separated by distillation.
Pebbles and sand can't.

If some salt is dissolved in a beaker of water, then
the salt is the solute and the water is the solvent.

The equation is not balanced because the number of atoms
of each element on the left is not equal to the number of atoms
of that element on the right. 
In fact, the total number of all atoms on the left (8) is not even
equal to the total number of all atoms on the right (10).
You might be interested in
According to the second law of thermodynamics, it is impossible for ____________. According to the second law of thermodynamics,
Tomtit [17]

Answer:

It's impossible for an ideal heat engine to have non-zero power.

Explanation:

Option A is incomplete and so it's possible.

Option B is possible

Option D is related to the first lae and has nothing to do with the second law.

Hence, the correct option is C.

The ideal engine follows a reversible cycle albeit an infinitely slow one. If the work is being done at this infinitely slow rate, the power of such an engine is zero.

We can also stat the second law of thermodynamics in this manner;

It is impossible to construct a cyclical heat engine whose sole effect is the continuous transfer of heat energy from a colder object to a hotter one.

This statement is known as second form or Clausius statement of the second law.

Thus, it is possible to construct a machine in which a heat flow from a colder to a hotter object is accompanied by another process, such as work input.

7 0
3 years ago
The speed of a box traveling on a horizontal friction surface changes from vi = 13 m/s to vf = 11.5 m/s in a distance of d = 8.5
ValentinkaMS [17]

The average power supplied to the box by friction while it slows from 13 m/s to 11.5 m/s is 3.24 W.

<h3>Acceleration of the box</h3>

The acceleration of the box is calculated as follows;

vf² = vi² + 2as

a = (vf² - vi²)/2s

a = (11.5² - 13²) / (2 x 8.5)

a = -2.16 m/s²

<h3>Time of motion of the box</h3>

The time taken for the box to travel is calculated as follows;

a = (vf - vi)/t

t = (vf - vi) / a

t = (11.5 - 13) / (-2.16)

t = 0.69 s

<h3>Average power supplied by the friction</h3>

P = Fv

P = (ma)(vf - vi)

P = (1 x -2.16) x (11.5 - 13)

P = 3.24 W

Thus, the average power supplied to the box by friction while it slows from 13 m/s to 11.5 m/s is 3.24 W.

Learn more about average power here: brainly.com/question/19415290

#SPJ1

7 0
2 years ago
Suppose that you changed the area of the bottom surface of the friction cart without changing its mass, by replacing the Teflon
insens350 [35]

Answer:

in this case the weight of the vehicle does not change , consequently the friction force should not change

Explanation:

The friction force is a macroscopic manifestation of the interactions of the molecules between the two surfaces, this force in the case of solid is expressed by the relation

          fr = μ N

          W-N= 0

          N = W

as in this case the weight of the vehicle does not change nor does the Normal one, consequently the friction force should not change

4 0
3 years ago
Which one of the following is a source of mechanical form of energy? A. Coal B.Wind C.Battery D.Magnet​
Simora [160]

wind (b), also some others are:

- steam

- gas

- liquid fules

3 0
2 years ago
The desperate contestants on a TV survival show are very hungry. The only food they can see is some fruit hanging on a branch hi
evablogger [386]

Answer:

a) v = 18.86 m / s, b)  h = 8.85 m

Explanation:

a) For this exercise we can use the conservation of energy relations.

Starting point. Like the compressed spring

          Em₀ = K_e + U = ½ k x² + m g x

the zero of the datum is placed at the point of the uncompressed spring

Final point. With the spring if compress

           Em_f = K = ½ m v²

how energy is conserved

          Em₀ = Em_f

          ½ k x² + m g x = ½ m v²

   

           v² = \frac{k}{m}  x² + 2gx

let's reduce the magnitudes to the SI system

          m = 500 g = 0.500 kg

          x = -45 cm = -0.45 m

the negative sign is because the distance in below zero of the reference frame

       

let's calculate

           v² = \frac{900}{0.500}  0.45² + 2 9.8 (- 0.45)

           v = √355.68

           v = 18.86 m / s

b) For this part we use the conservation of energy with the same initial point and as an end point at the point where the rock stops

           Em_f = U = m g h

           Em₀ = Em_f

            ½ k x²2 + m g x = m g h

            h = ½  \frac{k}{g}   x² + x

let's calculate

           h = \frac{1}{2} \ \frac{900}{9.8 } \ 0.45^2 - 0.45

           h = 8.85 m

measured from the point where the spring is uncompressed

7 0
3 years ago
Other questions:
  • A ____ is the time required for one half of the nuclei in a radio- ____ isotope to decay.
    9·1 answer
  • PLEASE HELP!!!!<br> Define constructive interference.
    6·1 answer
  • What must be attached to each carburetor on a gasoline inboard engine?
    10·1 answer
  • suppose you press a basketball against a wall. what happpens to the basketball when you are pressing it?
    14·1 answer
  • Calculate the temperature change when 1000J of heat is supplied to 100g of water.<br> Please explain
    12·2 answers
  • Problem 1 Observer A, who is at rest in the laboratory, is studying a particle that is moving through the laboratory at a speed
    10·1 answer
  • ohms Long describes the relationship between electronic current voltage and ___
    8·1 answer
  • I need help with one question on my homework. This is on the Specific Heat Capacity required practical.
    9·1 answer
  • a body dropped from a height reaches a velocity of 13m/s just before touching the ground. What is the initial height of the ball
    15·1 answer
  • On Earth, plasma exists in the ionosphere, in flames, and in chemical and nuclearexplosions. Matter in a controlled thermonuclea
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!