What is the velocity at 3 seconds?

A. -3.3 m/s
B. -2.0 m/s
C. -0.67 m/s
D. 5.0 m/s
E. 7.0 m/s

The mass of Block-B is DOUBLE the mass of Block-A.  (choice-a)

The mass of Block-B is twice the mass of Block-A and the mass of products = mass of reactants. This question asks us about the law of conservation of mass. Thus, option A is correct.

The law of conservation of mass states that matter can neither be created nor destroyed but can be transformed form one state or form to another. This is the basics of science which implies that whatever matter we have, it was created from something before it was converted into what we have at the moment.

However, this law does not hold nuclear reactions because they undergo changes in the core of the matter which can change the proton of that same matter or neutron from one element to another. This is to say that in nuclear reactions, matter can be created and it can also be destroyed.

Therefore, The answer to this problem is mass of products = mass of reactants and this question asks us about the law of conservation of mass. Thus, option A is correct.

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A mathematical model helps us understand science concepts by providing a simplified representation of complex phenomena.

A mathematical model helps us understand science concepts by providing a simplified representation of complex phenomena. It allows us to analyze and predict the behavior of the real system without directly studying it. For example, the kinetic molecular theory of gases is a mathematical model that helps us understand the behavior of gases by describing them as collections of moving particles.

Formula for density is

D = mass/volume

So...

Answer: 0.3479 g/cm^3

hope this helps!

The density of the sphere is approximately 3.58×10⁶ g/m³  or 3.58g/cm³.

To calculate the density (ρ) of an object, you can use the formula:

ρ= 4/3  πr³

​where m is the mass of the object and r is its radius.

In this case, the mass of the sphere is m=12g and the radius is r=2cm (r=0.02m in SI units).

Plugging in the values:

ρ= 12g / 4/3 π(0.02m)³

​First, calculate the volume of the sphere:

Volume= 4/3 π(0.02m)³

Volume≈3.35×10⁻⁶ m³

Now, divide the mass by the volume to find the density:

ρ= 12g / 3.35×10⁻⁶m³

ρ≈3.58×10⁶ g/m³

Therefore, the density of the sphere is approximately 3.58×10⁶ g/m³  or 3.58g/cm³.

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Answer:

The net force is 392N, pointing down.

Explanation:

The net force is the sum of all forces acting on the rock, namely the gravity ("+" acting downward) and the friction force due to air resistance ("-" acting upward):

[tex]F_{net} = F_g - F_{air}\\F_{net} = m\cdot g - F_{air} = 50kg\cdot 9.8\frac{m}{s^2}-98N= (490-98)N=392N[/tex]

The net force is 392N and pointing down (positive)/

The Answer is B) Office of Human Services Emergency Preparedness and Response

These are also called zones of equatorial calm and it is due a climatic phenomenon that is placed near the Earth equator, attributed to the soft winds, that are called calm winds as well; accompanied by systems of abundant rains and heat.

In this area periods of great calm occur when the winds virtually disappear completely, trapping the sailing ships for long periods (days or weeks). This is why the term doldrum became popular as a colloquial expression in the eighteenth century, to refer to "the caprice of the wind that slows down the navigation to sail".

The zone is located in the place where two trade winds meet, this means the trade winds of the northern hemisphere converge with those of the southern hemisphere, that is why this region is related to the intertropical convergence zone.

When a ball is thrown against a wall, the ball exerts a force on the wall, and the wall exerts an equal force in the  opposite direction back on the ball.  (D)

Answer:

The ball exerts a force on the wall and the wall exerts a force back.

Explanation:

When a ball is thrown against a wall, the ball exerts a force on the wall and the wall exerts a force back. This is due to Newton's third law of motion. According to this law, every action have equal and opposite reaction and both action and reaction forces acts on different object.

In this case, when a ball is thrown against a wall, the wall exerts an equal force on the the ball but in opposite direction. It follows the newton's third law.

Hence, the correct option is (D).  

To understand acceleration, you need to know speed and velocity.

Why?

Acceleration is the change in velocity, and the velocity equation is:

velocity = distance / time     Units: (m/s)

If a change in position means an object has a velocity, then that means that a change in velocity has an acceleration (I recommend you look at the graphs, it will help a lot to understand the relationship between each).

Now that we have some background, lets use it to answer the problem!

The change in velocity is from 25 m/s to 10 m/s, and we have a time. Lets plug it into the (average) acceleration equation so we can visualize it better!

The symbol delta means "change" : Δ

a = Δv / Δt

expanded to:

a = vf - vi / tf - ti  

(vf = velocity final, vi = velocity initial, tf = time final, ti = time initial)

So if the train's speed went from 25 m/s to 10 m/s, then that means that 10 m/s is our final velocity and 25 m/s is the initial:

a = 10 - 25 / 240

a = -15 / 240

a = -0.0625 m/s^2

Since we ended up with a negative number, it means that the train has a negative acceleration!!!!!

The fast way to do this:

25 m/s is bigger than 10 m/s, so that means that to go from 25 m/s to 10 m/s you have to slow down--otherwise known as putting on your brakes. So if the change in speed is negative then the acceleration will be negative.

In other words, if your final speed is less than your initial speed then your acceleration would be negative.

Sorry for the long explanation! I hope you never struggle with this again though!

Hope it helped,

Answer: negative acceleration

Explanation:

The force of friction between the dragster's tires and the track is 2352 newtons, calculated using the formula F=μN with the given mass of 300kg and the coefficient of friction 0.8.

The force of friction between the dragster's tires and the track can be calculated using the formula F=μN, where F is the frictional force, μ is the coefficient of friction, and N is the normal force. In this case, the normal force is equal to the weight of the dragster, which is the mass (m) times the acceleration due to gravity (g), N = mg. Given that the mass (m) is 300kg and the coefficient of friction (μ) is 0.8, the force of friction can be calculated as:

F = μ × mg = 0.8 × 300kg × 9.8m/s² = 2352N

Therefore, the force of friction is 2352 newtons (N).

A merging traffic sign is an example of a warning sign in traffic control. It warns that two separate streams of traffic will be converging into one lane, helping to manage traffic flow and prevent accidents.

A merging traffic sign is an example of a warning sign. Warning signs are important in traffic control as they signal upcoming hazards so that drivers can prepare and react accordingly. In the case of a merging traffic sign, it indicates that two separate streams of traffic will be converging into one lane.

Understanding this sign is vital to maintain road safety. Think of it like when many vehicles speed through an intersection without regard to the posted speed limit. A traffic signal is installed to manage the flow of vehicles and prevent possible accidents. That's the same concept with a merging traffic sign – it signals drivers to prepare for incoming vehicles from another lane and take appropriate action to prevent collisions.

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Cumulonimbus clouds will be your answer. They are both tall and associated with thunderstorms. Hope I helped!

35-17=18

18/2=9

9+9+17=35

Each hat cost him 9 dollars.

Answer:

5.77 × 10^2 s

Explanation:

Power is defined as the amount of work done divided by the tima taken to do that work:

[tex]P=\frac{W}{t}[/tex]

where W is the work done and t the time taken.

In this problem, we have:

- the power: [tex]P=1.51 \cdot 10^4 W[/tex]

- the work done: [tex]W=8.72 \cdot 10^6 J[/tex]

So we can re-arrange the previous equation to find the time taken:

[tex]t=\frac{W}{P}=\frac{8.72 \cdot 10^6 J}{1.51 \cdot 10^4 W}=5.77\cdot 10^2 s[/tex]

Answer:

B) 5.77 × 10^2 s

Explanation:

Electrical power is defined as

P = I * V

I = 3 amperes

V = 240 volts

Power = 3 * 240

Power = 720 Watts. Answer

I think it is there is no change in the energy's sunlight

Figure 1

Speed is a scalar quantity, It has only magnitude but no direction. It is defined as rate of change of distance.

Mathematically,    speed = distance÷time

                                     S = d ÷ t

                                      S = 2560 ÷ 60

                                      S =  42.67 m/s.

Bits:

Speed is a scalar quantity, that describes only the magnitude (42.67 m/s) of the rate of change of an objects distance. Determine the objects speed requires a unit of distance per unit of time

Figure 2

Velocity is a vector quantity, It has both magnitude and direction. It is defined as rate of change of displacement.

Mathematically, Velocity = Displacement ÷  time

                                     V =  75 ÷ 1.5

                                     V = 50 Km/h.

Velocity is a Vector quantity that describes both the magnitude and direction  of the rate of change of objects displacement plus it describes its position. An objects overall change in position is known as  its Displacement  per unit time.

Answer:

A. accelerating

Explanation:

Acceleration is defined as the ratio between the change in velocity and the time taken for the velocity to change:

[tex]a=\frac{\Delta v}{\Delta t}[/tex]

We must note that the velocity is a vector - so it has both a magnitude (the speed) and a direction.

This means that a non-zero acceleration occurs when:

- the speed changes, or

- the direction changes, or

- both the speed and the direction change

For an object moving at constant speed in a circle, the direction changes, so the object is accelerating.

Answer:

D. a result of experience

Explanation:

on edge

Answer:

The magnitude of the force on the horse by the cart is 60 N.

Explanation:

Given that,

mass of cart = 100 kg

Acceleration of cart = 0.50 m/s²

Horse exerted force on a cart F= 60 N

The cart is moving by the force is defined as:

[tex]F' = ma[/tex]

[tex]F' = 100\times0.50[/tex]

[tex]F' = 50\ N[/tex]

The cart is moving by the 50 N force.

But according to newton's third law,

Newton's third law is action reaction law.

When we exerted the force on the object then the object exerted same force but opposite direction.

Therefore,

A horse exerted the force on the cart and the cart exerted equal but opposite force on horse.

F=-F''

F = -60 N

So, The magnitude of the force is 60 N

Hence, The magnitude of the force on the horse by the cart is 60 N.

Given that

Heat (Q) = 700 J ,

Work (W) = 400 J ,

What is the final  internal energy of the system (u₂) = ?

                                       given  (u₁) = 1200 J

         we know that   ΔU = Q - W  Joules,

                        (U₂ - 1100) = 700 - 400

                                   U₂ = 300 +1100

                                         = 1400 J

The final internal energy is 1400 J

Answer:

[tex]1000 \Omega[/tex]

Explanation:

The relationship between voltage, resistance and current in a circuit is given by Ohm's law:

[tex]V=RI[/tex]

where

V is the voltage

R is the resistance

I is the current

In this problem, we have:

V = 10 V

R = ?

I = 10 mA = 0.010 A

Therefore, we can re-arrange the equation to find R:

[tex]R=\frac{V}{I}=\frac{10 V}{0.010 A}=1000\Omega[/tex]

Jumping with more acceleration

Answer:

Explanation:

D) Jumping with greater initial velocity would increase the height of his jump.  

Answer:

The tension force in the supporting cables is 7245N

Explanation:

There are two forces acting on the elevator: the force of gravity pointing down (+) with magnitude (elevator mass) x (gravitational acceleration), and the tension force of the cable pointing up (-) with an unknown magnitude F. The net force is the sum of these forces:

[tex]F_{net} = F_g - F = m\cdot g - F\\[/tex]

We are given the resulting acceleration along with the mass, i.e., we know the net force, allowing us to solve for F:

[tex]1150kg\cdot 3.5\frac{m}{s^2}= 1150kg \cdot 9.8\frac{m}{s^2}-F\\\implies F = 1150kg\cdot(9.8-3.5)\frac{m}{s^2}= 7245N[/tex]

The tension force F in the supporting cables is 7245N

In physics, Ohm's law is used to calculate the voltage in a circuit. With the current of 6 Amps and the resistance of 6 ohms, the voltage would be 36 Volts.

The subject matter of the question is related to a fundamental concept in Physics, called Ohm's law. Ohm's law states that the voltage (V) across a resistor is directly proportional to the current (I) through it, and the constant of proportionality is the resistance (R). It is represented by the formula V = I * R.

In your case, if the current (I) is 6 Amps and the resistance (R) is 6 ohms, using Ohm's law, the voltage (V) can be calculated as the product of current and resistance. Therefore, V = I* R = 6 Amps * 6 Ohms = 36 Volts.

So, the voltage in the circuit is 36 Volts.

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Answer:

B

Explanation:

mv'=(M+m)v

v'=d/t

v=x/t

m'=M/2

Md/2t=(M+M/2)x/t

Md/2=3Mx/2

d=3x=>x=d/3=6/3=2 m

The boat and the person moving in opposite directions is a result of the principle of conservation of momentum. The man's mass being half of the boat means the boat will compensate for his movement to conserve the total momentum, shifting in the opposite direction. However, the exact distance can't be determined without more details due to factors like water resistance.

In this case, we're dealing with a Physics problem. The topic is principle of conservation of momentum, which refers to the total momentum of an isolated system remaining constant if no external forces act on it.

As the total momentum of the system (boat and person) remains constant, the boat and the person move in such a way that their total momentum is preserved. The man's mass being half of the boat indicates that when the man moves to one end, the boat will shift by a certain distance in the opposite direction to conserve momentum.

However, as the resistance of water is neglected, we cannot calculate the exact distance the boat moves without more data. In real life, there are many factors like water resistance and the distributed mass of the boat that need to be accounted.

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Answer:

The frequency of the sound increases

Explanation:

This phenomenon is known as Doppler effect, and it occurs when the observer is moving relative to the source of the sound (as in this case, sine you are moving towards the police car).

When you are moving towards the source of the sound, the frequency of the siren appears to increase, according to the formula:

[tex]f'=\frac{v+v_o}{v}f[/tex]

where

f' is the apparent frequency of the sound

v is the speed of the sound wave

[tex]v_o[/tex] is the speed of the observer relative to the source, and it is positive if the observer is approaching the source, or negative if the observer is moving away

f is the real frequency of the sound (in this case, 750 Hz)

260 Newtons equals 26.51 Kg, or 58.44 lbs.

Hope this helps!

Answer:

Kinetic energy

Explanation:

kinetic energy is the energy of motion. When something is moving it would be in motion so it would have kinetic energy.

Answer:

When an object, in your example, a ball, rolls (with rolling friction) bounces off of another surface, the force from the barrier is transferred into the ball causing it to roll back. (Newton’s third law)

Explanation: