What force is caused by tiny collisions, called microwelds, on surfaces that
are stuck together?
A. heat
B. energy
C. air resistance
D. friction

Answer:

a person pushes a 125 kg

Explanation:

The total translational kinetic energy of the object is 122.5 J.

Kinetic energy is defined as the energy possessed by a body by virtue of its motion.

Here,

Mass of the object, m = 125 kg

The final velocity of the object, v = 1.4 m/s

It is given that the object was initially at rest on a frictionless surface. When the object was pushed by the person, it gained some amount of kinetic energy and ended up with a final velocity of 1.4 m/s.

So, the expression for total translational kinetic energy of the object is given by,

KE = KEf + KEi

KE = 1/2m(v² + u²)

Since, the object was initially at rest, the initial velocity,

u = 0

Therefore, the kinetic energy of the object,

KE = 1/2 mv²

KE = 1/2 x 125 x (1.4)²

KE = 122.5 J

Hence,

The total translational kinetic energy of the object is 122.5 J.

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Answer:

larger

Explanation:

just trust me

The smaller the mass of an object, the smaller its inertia, because the inertia of any object is directly proportional to the mass of the object

The ability of an object to resist changes in motion is known as inertia. The amount of inertia is directly related to an object's mass; in fact, as we frequently observe, the heavier an object is, the harder it is to change its direction of motion.

A straightforward illustration: While it is relatively simple to stop a tennis ball that has been thrown in our direction, we are aware that it is more difficult to stop a large truck that is moving in the same direction at the same speed. This is because the truck has a much higher mass than the tennis ball and a higher moment of inertia. As a result, inertia rises as mass does.

Since the inertia of any object is directly proportional to its mass, the smaller its mass, the less inertia it will have.

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Answer:

P = 500 W

Explanation:

Given that,

Work done to lift a crate to a height of 5 m is 5000 J

It takes 10 s

We need to find the power of the crate. We know that power is the rate of doing work. Mathematically, it can be given by :

[tex]P=\dfrac{W}{t}\\\\P=\dfrac{5000}{10}\\\\P=500\ W[/tex]

So, the power of the crate is equal to 500 W.

Answer:

The work efficiency formula is efficiency = output / input, and you can multiply the result by 100 to get work efficiency as a percentage. This is used across different methods of measuring energy and work, whether it's energy production or machine efficiency.

Explanation:

Hope this helped!!!

Answer:

photosynthesis

The air that enters human lungs contains about 21 percent oxygen. The process responsible for producing most of the Earth's oxygen is known as photosynthesis. In this process, plants and certain other organisms convert sunlight into oxygen and other products.

Explanation:

Hope it helps! Correct me if I am wrong!

I'm sure about my answer!

If you dont mind can you please mark me as brainlest?

Its ok if you don't want to!

But i hopefully it helps you!

Answer:

Photosynthesis I think

Explanation:

Answer:

42a. Ammeter 2 = 0.20 A

42b. Ammeter 3 = 0.20 A

42c. The current will remain the same i.e unchanged.

43. Equivalent resistance is 11780 Ω

46a. 11 V

46b. 7.5 V

46c. 18.5 V

47. 1.70 A

Explanation:

42a. Determination of ammeter 2

Ammeter 1 = 0.20 A

Ammeter 2 =?

Since the resistors are in series connection, the same current will pass through them. Thus, ammeter 2 will read 0.20 A.

Ammeter 2 = ammeter 1 = 0.20 A

42b. Determination of ammeter 3

Ammeter 1 = 0.20 A

Ammeter 3 =?

Since the resistors are in series connection, the same current will pass through them. Thus, ammeter 3 will read 0.20 A.

Ammeter 3 = ammeter 1 = 0.20 A

42c. Since the resistors are in series connection, the same current will pass through them. Therefore, the current will remain the same.

43. Determination of the equivalent resistance.

We'll begin by converting 1.1 KΩ and 10 KΩ to Ω. This can be obtained as follow:

1 KΩ = 1000 Ω

Therefore,

1.1 KΩ = 1.1 KΩ × 1000 Ω / 1 KΩ

1.1 KΩ = 1100 Ω

1 KΩ = 1000 Ω

Therefore,

10 KΩ = 10 KΩ × 1000 Ω / 1 KΩ

10 KΩ = 10000 Ω

Finally, we shall determine determine the equivalent. This can be obtained as follow:

Resistor 1 (R₁) = 680 Ω

Resistor 2 (R₂) = 1100 Ω

Resistor 3 (R₃) = 10000 Ω

Equivalent Resistance (Rₑq) =?

Rₑq = R₁ + R₂ + R₃

Rₑq = 680 + 1100 + 10000

Rₑq = 11780 Ω

Thus, the equivalent resistance is 11780 Ω

46a. Determination of the voltage across 22 Ω

Current (I) = 0.50 A

Resistor (R₁) = 22 Ω

Voltage (V₁) =?

NOTE: the current is the same since the resistor are in series connection.

V₁ = IR₁

V₁ = 0.5 × 22

V₁ = 11 V

46b. Determination of the voltage across 15 Ω

Current (I) = 0.50 A

Resistor (R₂) = 15 Ω

Voltage (V₂) =?

NOTE: the current is the same since the resistor are in series connection.

V₂ = IR₂

V₂ = 0.5 × 15

V₂ = 7.5 V

46c. Determination of the voltage of the battery.

Voltage 1 (V₁) = 11 V

Voltage 2 (V₂) = 7.5 V

Battery voltage (V) =?

V = V₁ + V₂

V = 11 + 7.5

V = 18.5 V

47. Determination of the current.

We'll begin by calculating the equivalent resistance. This can be obtained as follow:

Resistor 1 (R₁) = 22 Ω

Resistor 2 (R₂) = 4.5 Ω

Equivalent Resistance (R) =?

R = R₁ + R₂

R = 22 + 4.5

R = 26.5 Ω

Finally, we shall determine the current.

Voltage (V) = 45 V

Resistance (R) = 26.5 Ω

Current (I) =?

V = IR

45 = I × 26.5

Divide both side by 26.5

I = 45 / 26.5

I = 1.70 A

Answer:

gravity...................

Answer:

Hope it help you

Answer:

q = 1

Explanation:

Given that,

No. of electrons = -12

No. of protons = 13

We need to find the net charge on the balloon. We know that net charge is equal to the sum of proton and the electrons such that,

Net charge = No. of electrons + no. of protons

= -12 + 13

= 1

So, the net charge is equal to 1.

Answer:

although commons their deposits can dense

Answer:

Real answer is im sorry if im wrong

Explanation:

A 53°

The value of the angle Θ will be 51.3°. Option C is correct.

It is concerned with the geometry, region, and density of various 2D and 3D shapes.

From snell's law;

[tex]\rm n= \frac{sini}{sinr} \\\\ 0.8= \frac{sin(90-\theta)}{sin \theta} \\\\ 0.8= cot \theta \\\\ \theta= cot^{-1} (0.8)\\\\ \theta =51.3^0[/tex]

The value of the angle Θ will be 51.3°.

Hence,option C is correct.

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Letter B

without a medium, there is nothing to compress, hence, no wave. A fast- medium like a gas (air) is easy to compress and allows waves to move through it easily. a slow medium, like a liquid, is still pretty fast, but not as fast as air.

Answer:

1) x rays

Explanation:

Honestly Gamma rays has the Highest frequency, but in your options, gamma rays is not among, so x rays has the highest frequency among your options.

by Manshow

Answer:

The answer is (X-rays)

number 1

Answer:

Explanation:

 Investigators  thought this meant that oxygen was eight times more massive than hydrogen. They presumed the  chem-ical form-ula for water to be H-O

Hope this helped!!!  .

Answer:

Decreases the friction between the mallet and the pick.

Answer:

Doubled

Explanation:

F = (kq1q2) / r^2

F and q (Either q1 or q2) are directly proportional, so double the charge would also double the electruc force between the charges.

Answer: Decreases in mass cause decreases in kinetic energy due to the aforementioned positive relationship between the two. Therefore when mass is decreased, an increase in kinetic energy is possible if velocity increases.

Answer:: Decreases in mass cause decreases in kinetic energy due to the aforementioned positive relationship between the two.

Explanation:

Energy can be converted from one form to another. Examples: Gasoline (chemical) is put into our cars, and with the help of electrical energy from a battery, provides mechanical (kinetic) energy. ... Similarly, purchased electricity goes into an electric bulb and is converted to visible light and heat energy.

Answer:

Explanation:

Energy transformation is when energy changes from one form to another.  While energy can be transferred or transformed, the total amount of energy does not change – this is called energy conservation. For example, Electricity goes into an electric bulb and is converted to visible light and heat energy.

Hope this helped!!!

Answer:

0.6Nm

Explanation

Given

Force = 3N

Distance = 20cm = 0.2m

Moment = Force * perpendicular distance

Substitute

Moment = 3N  * 0.2

Moment = 0.6Nm

Hence her moment is 0.6Nm

Answer:

(i) Please see graph of the motion of the particles created with MS Excel and the calculations in the following sections

(ii) The time of collision is approximately 1.0 seconds

(iii) The common horizontal distance of point collision from the point of projection is approximately 25.2 meters

Explanation:

The velocity with which the first projectile was fired, v₁ = 21 m/s

The angle to the horizontal the particle is launched = 53.1°

The time at which the other particle was launched = 1 second later

The location from which the other particle was projected = 0.3 m below the first particle

The initial velocity of the second particle = 31.5 m/s

The angle to the horizontal at which the second particle was projected, θ = 36.9°

(i) The height reached, by each of the particle is given as follows;

y = u·t - 1/2·g·t²

For the first projectile, we have;

y = 21·(t₁+1)×sin(53.1°) - 9.81·(t₁+1)²/2 + 0.3

For the second projectile, we have;

y= 31.5·(t₁)×sin(36.9°) - 4.905·(t₁)²

If the two projectiles collide, we get;

21·(t₁+1)×sin(53.1°) - 9.81·(t₁+1)²/2 + 0.3  = 31.5·(t₁)×sin(36.9°) - 4.905·(t₁)²

Using a graphing calculator for simplifying, we get;

-11.93·t₁ + 12.2 = 0

t₁ = 12.2/11.93 ≈ 1.02

Therefore, at time t₁ = 1.02 seconds, after the launch of the second particle, the two particle will be at the same vertical height

However, whereby at the time, t₂, the particles collide, the horizontal distance travelled, 'x', will be equal;

We have;

x = u·cos(θ)·t₁

For the first particle, we have;

x₁₁ = 21 × cos (53.1°) × (t₂ + 1)

For the second particle, we have;

x₂₂ = 31.5 × cos (36.9°) × t₂

At the point of collision, we have;

x₁ = x₂

∴ 21 × cos (53.1°) × (t₂ + 1) = 31.5 × cos (36.9°) × t₂

31.5 × cos (36.9°) × t₂ - 21 × cos (53.1°) × t₂ = 21 × cos (53.1°)

t₂ = 21 × cos (53.1°)/(31.5 × cos (36.9°)  - 21 × cos (53.1°) ) = 1.00219236871

t₂ ≈ 1.0 seconds

Given that t₁ ≈ t₂, the particles reach the same height and the same horizontal distance at the same time, t₂ ≈ 1.0 and therefore, they collide.

(ii) The time of collision is found above as t₁ ≈ t₂ ≈ 1.0 seconds

(iii) The horizontal distance of the point of collision from the starting point, 'x', is given as follows;

x = 21 × cos (53.1°) × (1.0 + 1) ≈ 25.2

The horizontal distance of the point of collision from the starting point, x ≈ 25.2 meters

The vertical distance of the point of collision from the starting point of the second particle, 'y', is given as follows;

y = 21 × (1+1)×sin(53.1°) - 9.81 × (1+1)²/2 + 0.3 ≈ 14

The vertical distance of the point of collision from the starting point of the second particle, y ≈ 14 meters

The magnitude of the distance from the starting point of the second particle, r = √(25.2² + 14²) ≈ 28.8

The magnitude of the distance from the starting point of the second particle, r ≈ 28.4 meters.

Answer:

The correct answer is NONE the two forces must be equal and of opposite direction, the closest answer is D

Explanation:

In this exercise it is indicated that Jack pushes a car, it is desired that Jill pushes the car so that the speed is constant

take as positive the direction of Jack's thrust

             F_jack - F_jill = 0

              F_jill = F_jack

therefore the push of the two must be equal and Jill's push must have the opposite direction to Jack's push.

The correct answer is NONE the two forces must be equal and of opposite direction, the closest answer is D

Answer:

If you are talking about the experiment in which mouse and plants are kept in a closed glass jar in sunlight so in that case, they both survive because the CO2 released by the respiration of mouse is being utilized by the plants and fixed ( phosynthesis) and O2 is released as by product, which is taken by the mouse for respiration.

Explanation:

Answer:

BRAINLIEST PLSSSSSSSSSSSSSSSSSSSSSSSS

Thermodynamics

Explanation:

Thermodynamics is the study of energy. First Law of Thermodynamics: Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another.

Calculate V1 and V2 ( V = voltage )

Given that Vs = 16V, R1 = 330Ω, and R2 = 470Ω

Given that,

.°.

V1&V2↷

=> 330Ω + 470Ω =800Ω

Vˢ= IRᵀ

[tex]I= \frac{16}{800} = > \frac{1}{50}[/tex]

= 1/50 Ampere

Now,

V1 = IR

[tex]v1 = \frac{1}{50} \times 330 = > 6.6 \: Volt\ \\ v2 = \frac{1}{50} \times 470 = > 9.4 \: Volt[/tex]

______

Hope it helps

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Answer:

positive to negative.

Answer:

The force required will be "300 N".

Explanation:

The given values are:

Mass of object,

m = 300 kg

Acceleration,

a = 1 m/s

Now,

The force will be:

⇒  [tex]F=m\times a[/tex]

On substituting the values, we get

⇒      [tex]= 300\times 1[/tex]

⇒      [tex]=300 \ N[/tex]