A box on the ground is being pulled from the left and right by string. The box is accelerating to the left. What five forces are being used?

Answer:

30 N

Explanation:

Since the car travels at a steady speed of 20m/s and has a driving force of 30N, there is no net acceleration and thus, the resistive force is also 30 N in magnitude but in the opposite direction to the driving force. This is shown below.

F - f = f' where F = driving force = 30 N. f = resistive force and f'= net force.

f' = 0 since there is no acceleration. So,

F - f = 0

F = f = 30 N

The right answer is "30 N"

Answer explanation:

If a car is travelling at a steady speed, the resultant force must be zero, so the driving force and resistive force must be equal and opposite.

Hope it helps

Answer:

A light bulb has a resistance inside of it, when current flows through the resistance, the electrons interact with the electrons and particles inside the resistance. Those interactions leave energy in the resistance in the form of heat, so as the current flows through the resistance, the temperature of the resistance increases until the point it starts to become bright and starts radiating light (this happens really fast, that's why the light bulbs light up almost immediately)

When she puts the slider at position A, she reconnects a circuit. Now, for that circuit a current can flow, and pass through the resistance in the light bulb, this resistance heats up, and starts radiating light.

When she returns to position B, the circuit is not connected anymore. This means that the current flow stops, then there is no more current flowing through the resistance, then the resistance beggings to cool down, and stops radiating light.

Answer:

A

Explanation: The hotter things get the more thermal energy they have

Also don't ever take pictures like this again

Answer:A

Explanation:

1  kg of boiling water is hot enough to melt a block of ice more quickly

Answer:

The velocity of the merry-go-round after the boy hops on the merry-go-round is 1.5 m/s

Explanation:

The rotational inertia of the merry-go-round = 600 kg·m²

The radius of the merry-go-round = 3.0 m

The mass of the boy = 20 kg

The speed with which the boy approaches the merry-go-round = 5.0 m/s

[tex]F_T \cdot r = I \cdot \alpha = m \cdot r^2 \cdot \alpha[/tex]

Where;

[tex]F_T[/tex] = The tangential force

I =  The rotational inertia

m = The mass

α = The angular acceleration

r = The radius of the merry-go-round

For the merry go round, we have;

[tex]I_m \cdot \alpha_m = I_m \cdot \dfrac{v_m}{r \cdot t}[/tex]

[tex]I_m[/tex] = The rotational inertia of the merry-go-round

[tex]\alpha _m[/tex] = The angular acceleration of the merry-go-round

[tex]v _m[/tex] = The linear velocity of the merry-go-round

t = The time of motion

For the boy, we have;

[tex]I_b \cdot \alpha_b = m_b \cdot r^2 \cdot \dfrac{v_b}{r \cdot t}[/tex]

Where;

[tex]I_b[/tex] = The rotational inertia of the boy

[tex]\alpha _b[/tex] = The angular acceleration of the boy

[tex]v _b[/tex] = The linear velocity of the boy

t = The time of motion

When the boy jumps on the merry-go-round, we have;

[tex]I_m \cdot \dfrac{v_m}{r \cdot t} = m_b \cdot r^2 \cdot \dfrac{v_b}{r \cdot t}[/tex]

Which gives;

[tex]v_m = \dfrac{m_b \cdot r^2 \cdot \dfrac{v_b}{r \cdot t} \cdot r \cdot t}{I_m} = \dfrac{m_b \cdot r^2 \cdot v_b}{I_m}[/tex]

From which we have;

[tex]v_m = \dfrac{20 \times 3^2 \times 5}{600} = 1.5[/tex]

The velocity of the merry-go-round, [tex]v_m[/tex], after the boy hops on the merry-go-round = 1.5 m/s.

Answer: false

Explanation:

the more active you are, the more calories you are burning. consuming less calories is not ideal, you need to eat more since you are burning more than normal.

Answer:False

Explanation:The more active you are, the more calories you burn. Calories are a form of energy and you need to regain that energy by eating more calories

Answer:

option c

Explanation:

6420/55

116.7

approximately 117

Answer:

A cannon ball is fired with an initial velocity of 100.0 m/s at an angle ... resolve the initial velocity into its vertical and horizontal components. ... Yet another way would be to calculate the time it takes for the object

Explanation:

Answer:

2.7

Explanation:

Hope this helps also please follow me I am trying to help as many people possible!

Answer:

yes

Explanation:

If you've ever heard of lake effect snow that is when cold air mass moves across long expanses of warmer lake water. The lower layer of air, heated up by the lake water, picks up water vapor from the lake and rises up through the colder air above; the vapor then freezes and is deposited on the leeward (downwind) shore. this is most common with lake Michigan when cold air travels down from Canada making the neighboring states colder, so YES, being near any body of water can effect the climate.

I hope this helps

Answer:

Explanation:

Hurricane winds whip up large

waves in the ocean. These waves cause

a bulge of water in the ocean known

as a storm surge (stawrm surj). As

a storm moves over a coast, the

storm surge can cause water levels to

suddenly rise, or surge, several meters.

The main dangers in a hurricane

are flying objects, strong winds, and

flooding. If possible, leave areas

threatened by a hurricane. Take

prescription medicines with you.

If you stay in a building, board up

windows and stay away from windows

and doors. Store food, bottled water,

flashlights, and battery operated

radios. Stay away from beaches

and areas that may become flooded

Explanation:

KE = mv2 b. Suppose Karl uses a different puck with. = (85.0 kg)(8.5 m/s) half the mass ... How will. = 3.1X103 J the kinetic energy and work differ from KE; + PE; = KE; + PE those in ... If the puck has half the mass, it still .

Answer:

3431.875 J or 3.432 kJ

Explanation:

Kinetic energy can be found using the equation m/2*v^2.

We know m and v and we can plug in those values to get the answer.

95/2 times 8.5^2 = 3431.875 J or 3.432 kJ.

α prєcípítαtíσn rєαctíσn rєfєrs tσ thє fσrmαtíσn σf αn ínsσluвlє sαlt whєn twσ sσlutíσns cσntαíníng sσluвlє sαlts αrє cσmвínєd. thє ínsσluвlє sαlt thαt fαlls σut σf sσlutíσn ís knσwn αs thє prєcípítαtє, hєncє thє rєαctíσn's nαmє. prєcípítαtíσn rєαctíσns cαn hєlp dєtєrmínє thє prєsєncє σf vαríσus íσns ín sσlutíσn.

A precipitation reaction is a chemical reaction in which two soluble salts (ionic compounds) in an aqueous solution (solution with water as the solvent) yield insoluble, solid salt, a precipitate, as one of the products. It is generally a double replacement reaction, in which there are two ionic compounds, and their ions switch (AB+CD yield AC+BD).

Example:

[tex]\mathbb{\green{Pb(NO_{3} )_{2} +2KI  ⇒2KNO_{3} +PbI_{2}}}[/tex]

N.B. The (s) indicates a solid (or precipitate), whereas (aq) means that the compound is dissolved in an aqueous (water-containing) solution.

Answer:

A. In a closed system, the potential energy at the bottom is equal to the kinetic energy at the top.

Explanation:

According to the law of conservation of energy, energy is neither created nor destroyed but transformed from one form to another.

Based on the premise of the law of conservation of energy, both kinetic energy and potential energy are equal at the top and bottom in the system.

This way energy is conserved.

Answer:

231000kgm/s

Explanation:

Given parameters:

Mass of train car = 16500kg

Constant speed  = 14m/s

Unknown:

Momentum of the car  = ?

Solution:

To solve this problem, we must understand that the momentum of a body is the quantity of motion a body possess.

So;

 Momentum   =  mass x velocity

 Momentum  = 16500 x 14  = 231000kgm/s

[tex]E_c = \dfrac{mv^2}{2}[/tex]

[tex]E_c = \dfrac{25\cdot (5^2)}{2}[/tex]

[tex]E_c = 312.5 \text{ J}[/tex]

Answer:

Objects in orbit around the Earth (like a satellite) still have net forces acting on them. True; An object with no net forces acting on it would not have a change in velocity. ... Therefore, there must be a net force acting on it.

Explanation:

Objects  in orbit around the Earth (like satellites) still have net forces acting on them. This is true, because this net force make change in their motion.

Force is an external force acting on object to change its state of motion or rest or to deform it. There are various kinds of forces such as gravitational force, magnetic force, nuclear force etc. Force is a vector quantity having both magnitude and direction.

The net force acting on a body depends on the direction and magnitude of all the forces acting on the object. The force acting on the objects that are orbiting around earth includes the gravitational force by earth, as well the force by other nearby planets or spatial objects etc.

Not all these force gets balanced and a net force always be there acting on these objects make them undergo changes in their state of motion.

Find more on forces:

https://brainly.com/question/13018226

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Answer:

a

Explanation:

because your trying to decide

The measuring of how light reflects off of mirrors made from different materials falls under the field of optics. Therefore, option (C) is correct.

Optics can be described as the branch of physics that studies the behavior, and properties of light and its interactions with matter and the construction of instruments that detect it. Optics can be described as the behavior of visible, ultraviolet, and infrared light because the light is electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties.

The most general is geometric optics which treats light as a collection of rays that travel in straight lines and bend as they pass through or reflect from surfaces.

Physical optics can be described as a more comprehensive model of light, which involves wave effects such as interference and diffraction and that cannot be considered in geometric optics.

Learn more about optics, here:

https://brainly.com/question/14703021

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Answer:

the momentum is 50 kg m/s

Explanation:

The computation of the momentum is shown below;

As we know that

Momentum = mass × velocity

where

mass = 5 kg

And, the velocity is 10 m/s

So, the momentum is

= 5 × 10

= 50 kg m/s

Hence, the momentum is 50 kg m/s

Answer:

W= m*g

5.4=9.8*m

mass = 0.55

Answer:

I am pretty sure that it is one

Answer:

Explanation: is 1

Answer:

idrk im jus here for the points[tex]\lim_{n \to \infty} a_n \lim_{n \to \infty} a_n \lim_{n \to \infty} a_n \lim_{n \to \infty} a_n \lim_{n \to \infty} a_n \lim_{n \to \infty} a_n[/tex]∈ω≠≠

Explanation:

Answer:

I think that is true not sure

Answer:

145854.24J

Explanation:

Given parameters:

Specific heat capacity of water = 4.184J/g°C

Mass of the water  = 700g

Initial temperature  = 25.6°C

Final temperature = 75.4°C

Unknown:

Thermal energy  = ?

Solution:

To solve this problem, we use the expression below;

 H  = m x c x Ф

H is quantity of heat

m is the mass

c is the specific heat capacity

Ф is the temperature change

  H  = 700 x 4.184 x (75.4 - 25.6)  = 145854.24J

Answer:

k  = 51.09 N/m

Explanation:

Given,

mass, m₁ = 0.3 Kg

length of spring, x₁ = 0.27 m

Mass, m₂ = 2.80 Kg

Length of spring, x₂ = 0.750

We know that

Restoring force, F = k x

Gravitation force, F = m g

Now,

m₁ g = k x₁ ......(1)

And

m₂ g = k x₂   .......(2)

where k is spring constant

Subtracting equation (2)- (1)

(m₂-m₁)g = k(x₂-x₁)

(2.8-0.3) x 9.81 = k (0.75 - 0.27)

24.525 = k x 0.48

k  = 51.09 N/m

Hence, spring constant is 51.09 N/m.

Answer:

32.32857

Explanation:

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