Answer:
**What is Friction?**

**Friction **is the resistance to motion of one object moving relative to another. The friction will be **7.77**

According to the** International Journal** of Parallel, Emergent and Distributed Systems(opens in new tab), it is not treated as a fundamental force, like gravity or **electromagnetism.** Instead, scientists believe it is the result of the **electromagnetic attraction** between charged particles in two touching surfaces.

**Scientists** began piecing together the laws governing friction in the 1400s, according to the book **Soil Mechanics**(opens in new tab), but because the interactions are so complex.

**F=μ*m, n=w** which also means n=mg, 14.7=0.193*n, n=76.2, 76.2=m*9.8, **m=7.77.**

Therefore,** Friction **is the resistance to motion of one object moving relative to another. The friction will be **7.77.**

To learn more about **Friction,** refer to the link:

#SPJ2

Answer:

**Answer:**

7.77

**Explanation:**

F=μ*m

n=w which also means n=mg

14.7=0.193*n

n=76.2

76.2=m*9.8

m=7.77

A block of mass m slides with a speed vo on a frictionless surface and collides with another mass M which is initially at rest. The two blocks stick together and move with a speed of vo /3. In terms of m, mass M is most nearly_____.

The electric field just above the surface of the charged drum of a photocopying machine has a magnitude E of 2.5 × 105 N/C. What is the surface charge density on the drum, assuming that the drum is a conductor?

a painting in an art gallery has height h and is hung so that its lower edge is a distance d above the eye of an observer. How far from the wall should the observer stand to get the best view?

Two blocks of masses 1 = 700 and 2 = 1100 are connected by a cord of negligible mass and hung over a diskshaped pulley, as shown in the figure. The pulley has a mass of = 1.50 and a radius of = 14 , and rotates about a lightweight axle through its center. The axle itself is hung from the ceiling by two like cords of negligible mass and is held horizontally. The system is released from rest. a) Draw a free-body diagram for each of the blocks and the pulley separately. b) Find the magnitude of the acceleration of the blocks. c) Find the magnitude of the angular acceleration of the pulley. d) Find the magnitude of tensions in the cords, 1, 2, and 3. (See the figure.)

A 3.00N rock is thrown vertically into the air from the ground. At h=15.0m, v=25m/s upward. Use the work-energy theorem to find the initial speed of the rock.a. 3m/sb. 30.3 m/sc. None of the above

The electric field just above the surface of the charged drum of a photocopying machine has a magnitude E of 2.5 × 105 N/C. What is the surface charge density on the drum, assuming that the drum is a conductor?

a painting in an art gallery has height h and is hung so that its lower edge is a distance d above the eye of an observer. How far from the wall should the observer stand to get the best view?

Two blocks of masses 1 = 700 and 2 = 1100 are connected by a cord of negligible mass and hung over a diskshaped pulley, as shown in the figure. The pulley has a mass of = 1.50 and a radius of = 14 , and rotates about a lightweight axle through its center. The axle itself is hung from the ceiling by two like cords of negligible mass and is held horizontally. The system is released from rest. a) Draw a free-body diagram for each of the blocks and the pulley separately. b) Find the magnitude of the acceleration of the blocks. c) Find the magnitude of the angular acceleration of the pulley. d) Find the magnitude of tensions in the cords, 1, 2, and 3. (See the figure.)

A 3.00N rock is thrown vertically into the air from the ground. At h=15.0m, v=25m/s upward. Use the work-energy theorem to find the initial speed of the rock.a. 3m/sb. 30.3 m/sc. None of the above

The **extension **of the **spring in the elevator **is** 60 mm.**

For the **extension** of the **spring **to be **zero**, the **elevator **must be moving **downwards** under free fall.

The given parameters;

*mass of the box, m = 5 kg**extension of the spring, x = 50 mm = 0.05 m*

The **spring constant **is calculated as follows;

F = kx

mg = kx

The **tension **on the **spring **in an **elevator **accelerating upwards is calculated as follows;

T = mg + ma

T = m(g + a)

T = 5(9.8 + 2)

T = 59 N

The **extension **of the **spring **is calculated as follows;

For the **extension** of the **spring** to be **zero**, the **elevator** must be under** free fall**, such that the **tension** on the spring is **zero.**

For free fall, a = g

T = m(g - a) = 0

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**Answer:**

**a) **the spring will stretch **60.19 mm** with the same box attached as it accelerates upwards

**b) **spring will be relaxed when the elevator accelerates downwards at **9.81 m/s²**

**Explanation:**

Given that;

Gravitational acceleration g = 9.81 m/s²

Mass m = 5 kg

Extension of the spring X = 50 mm = 0.05 m

Spring constant k = ?

we know that;

mg = kX

5 × 9.81 = k(0.05)

k = 981 N/m

a)

Given that; Acceleration of the elevator a = 2 m/s² upwards

Extension of the spring in this situation = X1

Force exerted by the spring = F

we know that;

ma = F - mg

ma = kX1 - mg

we substitute

5 × 2 = 981 × X1 - (5 ×9.81 )

X1 = 0.06019 m

X1 = **60.19 mm**

Therefore the spring will stretch **60.19 mm** with the same box attached as it accelerates upwards

B)

Acceleration of the elevator = a

The spring is relaxed i.e, it is not exerting any force on the box.

Only the weight force of the box is exerted on the box.

ma = mg

a = g

a = **9.81 m/s²** downwards.

Therefore spring will be relaxed when the elevator accelerates downwards at **9.81 m/s²**

t or f

**Answer:**

Atomic mass is a value that depends on the distribution of an element's isotopes in nature and the masses of those isotopes. Circle the letter of each sentence that is true about a carbon-12 atom. ... Most elements exist as a mixture of two or more isotopes.

So the answer is true.

Thank you and please rate me as brainliest as it will help me to level up

**Answer:**** The average kinetic energy of hydrogen atoms is **

**Explanation:**

**To calculate the average kinetic energy of the atom, we use the equation:**

where,

K = average kinetic energy

k = Boltzmann constant =

T = temperature =

**Putting values in above equation, we get:**

**Hence, the average kinetic energy of hydrogen atoms is **

**Answer:**

The linear velocity is represented by the following expression:

**Explanation:**

From Rotation Physics we know that linear velocity of a point moving with uniform circular motion is:

**(Eq. 1)**

Where:

- Radius of rotation of the particle, measured in meters.

- Angular velocity, measured in radians per second.

- Linear velocity of the point, measured in meters per second.

But we know that angular velocity is also equal to:

**(Eq. 2)**

Where:

- Angular displacement, measured in radians.

- Time, measured in seconds.

By applying **(Eq. 2)** in **(Eq. 1)** we get that:

**(Eq. 3)**

From Geometry we must remember that circular arc (), measured in meters, is represented by:

The linear velocity is represented by the following expression:

To solve this problem, it is necessary to apply the concepts related to the conservation of momentum, the kinematic equations for the description of linear motion and the definition of friction force since Newton's second law.

The conservation of momentum can be expressed mathematically as

Where,

= Mass of each object

= Initial Velocity of each object

= Final velocity

Replacing we have that,

With the final speed obtained we can determine the acceleration through the linear motion kinematic equations, that is to say

Since there is no initial speed, then

Finally with the acceleration found it is possible to find the friction force from the balance of Forces, like this:

Therefore the Kinetic friction coefficient is 0.7105

**Answer:**

**Explanation:**

First, it is required to model the function that models the increasing force in the +x direction:

The equation is:

The impulse done by the engine is given by the following integral: