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
anyanavicka [17]
3 years ago
14

PLEASE READ THIS FIRST SO WE GET THE CORRECT ANSWER

Physics
1 answer:
sladkih [1.3K]3 years ago
7 0

Answer:

B=the control group

Explanation:

You might be interested in
Concave lenses have _ focal lengths and always form _ images
zhannawk [14.2K]

The correct answer of this question is : Negative focal length and virtual images.

EXPLANATION:

The concave lens is that transparent spherically refracting surface which is diverging in nature. It is so because it is bulged at the edges and thinner in the centre.

The focal length of the concave lens is always taken negative.

As the lens is diverging in nature, it always forms virtual,erect and diminished image. It means the image formed by concave lens has less size as compared to object.

Hence, the correct answer of this question is that concave lenses have negative focal length and always form virtual images.

4 0
3 years ago
Muscle fibers move back and forth during _____.
crimeas [40]

Answer:

it must move back and forth during sex

5 0
3 years ago
Read 2 more answers
A 2.0-kg ball has a momentum of 25kg.m/s what is the ball's speed?
Reil [10]

We know, momentum = mass * speed

25kgm/s = 2 kg * s

s = 25/2 = 12.5 m/s

5 0
3 years ago
Read 2 more answers
A 325-g model boat facing east floats on a pond. The wind in its sail provides a force of 1.85 N that points 25° north of east.
podryga [215]

Answer:

Vf = 4.40  m/s  and  θ = 88º

Explanation:

To solve this problem, let's look for the resultants of the force and with this we calculate the accelerations in each axis.

Let's use trigonometry to break down the forces

     Sin 25 = F1x / F1

     Cos 25 = F1y / F1

     Fix = F1 sin 25

     F1x = 1.85 sin 25

     F1x = 0.78 N

     F1y = 1.85 cos 25

     F1y = 1.67 N

     F2 = - 0.782 N j ^  (south)

     F3 = - 0.750 N i ^    (west)

We write Newton's second law

X axis (East-West)

     F1x - F3 = m ax

     ax = (F1x - F3) / m

     ax = (0.78 - (0.750)) / 0.325

     ax = 0.092 m / s²

Y axis (North-South)

     F1y - F2 = m ay

     ay = (1.67- (0.782)) / 0.325

     ay = 2.73 m / s²

Let's calculate the magnitude and direction of the acceleration

     a = RA ax2 + ay2

     a = RA 0.092² + 2.73²

     a =  2.73m / s²

     tan θ = ay / ax

     θ = tan⁻¹ (2.73/0.092)

     θ = tan⁻¹ 29.67

     θ = 88º

We calculate the speed, notice that we use the total acceleration to be able to use the totol displacement

Vf² = vo² + 2 at D

Vf² = 0 + 2 2.73 3.55

Vf = √ 19.38

Vf = 4.40  m / s

θ = 88º

8 0
3 years ago
In order to produce a current in a cell, the terminals must what?
Troyanec [42]
A. They must have a potential difference
Potential difference is voltage and voltage is basically the thing that causes current to flow
4 0
3 years ago
Other questions:
  • As a carbonated drink, such as soda, is heated, what happens to the solubility of carbon dioxide gas in the drink?
    10·1 answer
  • A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 290 kg) that is also at rest. The lumberjac
    13·1 answer
  • What happens to the momentum of an object when velocity is kept the same and the mass is increased?
    14·1 answer
  • One of the challenges of wind power is _____. the location of wind farms the ongoing cost of wind power that it adds carbon to t
    12·2 answers
  • Large wind turbines with a power capacity of 8 MW and blade span diameters of over 160 m are available for electric power genera
    12·2 answers
  • The Earth moving round the Sun in a circular orbit is acted upon by a
    8·1 answer
  • List possible causes of fever and explain the benefits of fever
    12·1 answer
  • Differents between foundamental quantity and derived quantities
    10·1 answer
  • Explain why solar and lunar eclipses happen.
    12·1 answer
  • What is resistivity?​
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!