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
GaryK [48]
3 years ago
14

7.

Physics
2 answers:
telo118 [61]3 years ago
7 0

Contact are those types of forces that result when the two interacting objects are perceived to be physically contacting each other.

Answer: Option B

<u>Explanation:</u>

A contact force is any force that requires contact to occur. Kick a ball or push a desk in a room, driving a car up a hill, are the best daily life examples. Here, the question itself says “contacting”. So, undoubtedly, it is contact forces.

The toy moves because a force is continuously applied by someone on the toy, while in the second case, the given force is applied in the form of impulse. Another contact force, we can simply understand is frictional force.

sukhopar [10]3 years ago
6 0

Answer:

The answer is B, contact!

Explanation:

The two objects are contacting (or interacting) each other.

You might be interested in
At what distance is the electrostatic force between two protons equal to the weight of one?.
erik [133]

0.118 m is the distance between the two protons.

Mass of proton = 1.6726 × 10⁻²⁷ kg

Weight of proton= 1.6726 × 10⁻²⁷ x 9.81 N

                            = 1.6408 × 10⁻²⁶ N

Charge of proton = 1.602 × 10⁻²⁹ C

The force between two protons = kq²/r²     where, K is a proportionality    

                                                            constant, q is a charge of proton and  

                                                         r is the distance between two protons.          

                                                       = 9 × 10⁹ × (1.602×10⁻¹⁹)²/r²      

To calculate distance :

  Weight of proton= Force between protons

 ⇒   1.6408 × 10⁻²⁶ N = 9 × 10⁹ × (1.602×10⁻¹⁹)²/r²

 ⇒    r = 0.118m

Therefore, 0.118 m is the distance between the two protons.

Learn more about electrostatic force here:

brainly.com/question/18108470

#SPJ4

8 0
2 years ago
Debido al desorden en el laboratorio un científico tiene 2 termómetros diferentes pero no sabe en qué escalas están por lo que d
just olya [345]

Answer:

La escala del termómetro ''A'' es grados Celsius.

La escala del termómetro ''B'' es grados Fahrenheit.

Explanation:

Para hallar en qué escalas están los termómetros partimos de que la mezcla a la cuál se midió su temperatura mantuvo su temperatura constante.

Esto quiere decir que los termómetros están expresando la misma temperatura pero en una escala distinta.

Sabemos que dada una temperatura en grados Celsius ''C'' si la queremos convertir a grados Fahrenheit ''F'' debemos utilizar la siguiente ecuación :

F=(\frac{9}{5})C+32 (I)

Ahora, si reemplazamos y asumimos que la temperatura de 18° es en grados Celsius, entonces si reemplazamos C=18 en la ecuación (I) deberíamos obtener F=64.4 ⇒

F=(\frac{9}{5}).(18)+32=32.4+32=64.4

Efectivamente obtenemos el valor esperado. Finalmente, corroboramos que la temperatura del termómetro ''A'' está medida en grados Celsius y la temperatura del termómetro ''B'' en grados Fahrenheit.

6 0
3 years ago
A man is sitting on a chair with wheels. He grabs a 2.1 kg book from the desk and throws
geniusboy [140]

The speed of the man and the chair after the book is thrown is 0.2 m/s.

The given parameters:

  • <em>mass of the book, m₁ = 2.1 kg</em>
  • <em>speed of the book, u₁ = 7.2 m/s</em>
  • <em>mass of the man, M = 70 kg</em>
  • <em>mass of the book, m = 9.2 kg</em>

<em />

The total mass of the man and the book is calculated as follows;

m₂ = 70 kg + 9.2 kg

m₂ = 79.2 kg

The speed of the man and the chair after the book is thrown is determined by applying the principle of conservation of linear momentum;

m_1 u_1 = m_2u_2\\\\u_2 = \frac{m_1u_1}{m_2} \\\\u_2 = \frac{2.1 \times 7.2}{79.2} \\\\u_2 = 0.2 \ m/s

Thus, the speed of the man and the chair after the book is thrown is 0.2 m/s.

Learn more about conservation of linear momentum here: brainly.com/question/7538238

8 0
3 years ago
The second law of thermodynamics states that
frosja888 [35]
The second law of thermodynamics states that the state of entropy of the entire universe, as an isolated system, will always increase over time. The second law also states that the changes in the entropy in the universe can never be negative.
5 0
3 years ago
What is the frequency of light when the energy for a mole of photons is 1. 55 × 1013 j?.
ValentinkaMS [17]

The frequency of light is 3.88 x 10^22Hz.

What is electromagnetic radiation?

The electromagnetic spectrum is the area where the electromagnetic radiation that we see as light, or visible light, is found. Visible light usually has wavelengths between 400 and 700 nanometers (nm) or frequencies between 750 and 420 terahertz, which are between the longer wavelengths of infrared and ultraviolet (with shorter wavelengths).

E = 1.55 x10^13 J/ mol

E = hv

v = 1.55 x 10^13/1mol  x 1mol/6.023 x )/6.626 x

velocity = 3.88x10^22 s-1

since 1 Hz = 1/ s = 1

velocity =3.88x 10^22 Hz

To learn more about Light the link is given below:

brainly.com/question/1555553

#SPJ4

3 0
2 years ago
Other questions:
  • Water, initially saturated vapor at 4 bar, fills a closed, rigid container. The water is heated until its temperature is 360°C.
    12·1 answer
  • Which is the correct definition of a chemical reaction? A. Substances are mixed together. B. Substances interact to form new sub
    5·1 answer
  • What force would be required to accelerate a 1.100 kg car to 0,5 m/s27
    10·1 answer
  • easy A solid disk rotates in the horizontal plane at an angular velocity of 0.067 rad/s with respect to an axis perpendicular to
    8·1 answer
  • Help me plzzz I need answers
    14·1 answer
  • In one type of solar energy system, sunlight heats the air within solar panels, which heats copper tubes filled with water. What
    12·2 answers
  • With Brainly, what happens if no one answers your question? Do you get points back?
    11·2 answers
  • If your body is wet what is the lowest electrical voltage can be fatal?
    8·1 answer
  • What is the difference between primary cells and secondary cells?​
    11·2 answers
  • Two people are pulling straight down on ropes attached to a wheel. The wheel has a radius of 2.42 m. One person pulls in a clock
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!