A train going 14m/s moves 250 m while accelerating to a stop. What is the train’s deceleration?

Answer:

[tex]2365.71\ \text{J/kg}^{\circ}\text{C}[/tex]

Explanation:

V = Voltage = 230 V

I = Current = 1.8 A

[tex]\Delta T[/tex] = Temperature change = [tex](40-12)^{\circ}\text{C}[/tex]

t = Time taken = 2 minutes

m = Mass of liquid = 750 g

c = Specific heat capacity of the liquid

Energy required to heat the water is equal to the heat released due to current passing

[tex]mc\Delta T=VIt\\\Rightarrow c=\dfrac{VIt}{m\Delta T}\\\Rightarrow c=\dfrac{230\times 1.8\times 2\times 60}{0.75\times (40-12)}\\\Rightarrow c=2365.71\ \text{J/kg}^{\circ}\text{C}[/tex]

The specific heat capacity of the liquid is [tex]2365.71\ \text{J/kg}^{\circ}\text{C}[/tex]

Answer:

-3.33 ms^-2

Explanation:

Hope it helps

Answer:

Mechanical energy

Explanation:

A car changes chemical energy from fuel into thermal energy and mechanical energy.

Mechanical energy can be defined as the type of energy that is possessed by an object due to its motion or position. Mechanical energy is the sum of potential energy and kinetic energy, that is, the sum of energy in motion and stored energy. Examples of mechanical energy includes driving a car, riding a bicycle, listening to music etc.

Types of mechanical energy

1. Motion energy (kinetic energy)

2. Stored energy(potential energy)

Mechanical energy = Kinetic energy + Potential energy

Answer:

cold

Explanation:

Answer: They are put in front for defense so so they can block the opponents from getting the ball

Explanation:

Answer:

Heavier football players are usually on the front line because they have a low point in gravity therefore they are able to block the back running players in a better way. And its Newton's second law.

Explanation:

Answer:

Rubbing Alcohol

Explanation:

Answer:

self perception

Explanation:

i think its self perception because he tells to others

Answer:

b

Explanation:

b

Answer:

Ice melting

Explanation:

You can see ice melting and its a physical change. Iron rusting is not a physical change and wood burning is not either and garbage is not either.

Answer:

The magnitude and direction of the centripetal acceleration will be:

[tex]a_c=5[/tex] m/s²   (towards the center of the circle).

Explanation:

Given

Using the formula to determine the centripetal acceleration

[tex]a_c=\frac{v^2}{r}[/tex]

[tex]a_c=\frac{\left(10\right)^2}{20}[/tex]

[tex]\:a_c=\frac{100}{20}[/tex]

[tex]a_c=5[/tex] m/s²

As the truck is moving in a circle, therefore the direction is towards the center of the circle.

Hence, the magnitude and direction of the centripetal acceleration will be:

[tex]a_c=5[/tex] m/s²   (towards the center of the circle).

Answer:

OWOWOWOOWOWOWEO. PORK = PORK NOW GIOVE BRAINLIEST BC I SAID PORK = PORK

Explanation:

Answer:

11 because the number of protons is the atomic humber

Explanation:

Answer:

21.18 L

Explanation:

From the question given above, the following data were obtained:

Initial pressure (P₁) = 1 atm

Initial volume (V₁) = 18 L

Final pressure (P₂) = 0.85 atm

Final Volume (V₂) =?

With the application of the Boyle's law equation, we can obtain the final volume (i.e the new volume) of the gas as follow:

P₁V₁ = P₂V₂

1 × 18 = 0.85 × V₂

18 = 0.85 × V₂

Divide both side by 0.85

V₂ = 18 / 0.85

V₂ = 21.18 L

Therefore, the new volume of the gas will be 21.18 L

Answer: C

Explanation:

The pendulum will have the most energy at the bottom of its swing

c. At point C  the pendulum have the most kinetic energy.

Kinetic energy is a form of energy that an object or a particle has by reason of its motion.

If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.

Kinetic energy is defined as:

⇒E = 1/2mv²

Here, the mass of the pendulum bob won't change, the only way for kinetic energy to change is for the speed of the pendulum to change. Kinetic energy is highest when the velocity is the highest.

This occurs at the bottom of the pendulum. An active pendulum has the most kinetic energy at the lowest point of its swing when the weight is moving fastest.

Therefore,

At point C  the pendulum have the most kinetic energy.

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Answer:

The time it takes the body to cover the remaining H/4 is T

Explanation:

The maximum height attained by the body = H

The time it takes the body to reach 3/4×H = T

From the kinematic equation, h = u·t - 1/2·g·t², we have;

u = 0 m/s at for the object returning back down at maximum height, therefore at the maximum height, we have;

H = u × 0 + 1/2·g·t²

H = 1/2·g·t²

t = √(2·H/g)

When h = 3/4×(H) from below, we have;

h = H/4 from above, which gives;

[tex]t_{H/4}[/tex] = √(2·H/4/g) = √(H/(2·g)) = 1/2 × √(2·H/g)

∴ The time it takes the body to cover H/4 height, while falling from above [tex]t_{H/4}[/tex] = 1/2 × √(2·H/g)  

The time, [tex]t_{3 \times H/4}[/tex], it takes to cover the remaining 3/4×(H) while falling from above is [tex]t_{3 \times H/4}[/tex] = T = t - 1/2 × √(2·H/g) = √(2·H/g) - 1/2 × √(2·H/g) = 1/2 × √(2·H/g)

∴ T = 1/2 × √(2·H/g)

Therefore, the time it takes the body to reach a height of 3/4H = The time it takes the body to cover the remaining H/4 = T.

Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 15 × 2

We have the final answer as

Hope this helps you

Answer:water gets hot at 212 so incress

Explanation:

Answer:

False

Explanation:

It will increase

Answer:

F = 878.9 N

Explanation:

The electrostatic force of attraction or repulsion is given by Coulomb's Law as follows:

F = kq₁q₂/r²

where,

F = Force pf repulsion between balloons = ?

k = Coulomb's Constant = 9 x 10⁹ N.m²/C²

q₁ = q₂ = magnitudes of 1st and 2nd charge = 0.0025 C

r = distance between balloons = 8 m

Therefore,

F = (9 x 10⁹ N.m²/C²)(0.0025 C)(0.0025 C)/(8 m)²

F = 878.9 N

The magnitude of the electrical force of repulsion between them is F = 878.9 N

Here we use Coulomb's Law

F = kq₁q₂/r²

Here,

F = Force of repulsion

k = Coulomb's Constant = 9 x 10⁹ N.m²/C²

q₁ = q₂ = magnitudes of 1st and 2nd charge = 0.0025 C

r = distance between balloons = 8 m

So,

F = (9 x 10⁹ N.m²/C²)(0.0025 C)(0.0025 C)/(8 m)²

F = 878.9 N

Hence, The magnitude of the electrical force of repulsion between them is F = 878.9 N

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Answer:

Escape speed (the speed that is different about any planet.)

Answer:

Ammeters are connected in series and voltmeters are connected in parallel in a circuit

Answer:

Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces.

Explanation:

What are Newton's 1st 2nd and 3rd laws of motion?

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

d

I think the most common way of doing it was for the first

Answer:

Cold to hot.

Explanation:

Heat can never flow from cold to hot, heat transfers itself from hot to cold.

Answer:

The robot should hold the bucket at 137.6 m from the start of the field

Explanation:

Horizontal Motion

When an object is launched horizontally with a speed v from a height h, it describes a curved path exclusively ruled by gravity until it eventually hits the ground.

The range or maximum horizontal distance d traveled by the object can be calculated as follows:

[tex]\displaystyle d=v\cdot\sqrt{\frac {2h}{g}}[/tex]

Birdman flies horizontally at a  speed of v=40 m/s and a height of h=58  m. He releases a turd above the start of the field. If the robot was exactly down  Birdman, then it won't catch the turd with the bucket because it would land farther away by a distance equal to the range. Thus:

[tex]\displaystyle d=40\cdot\sqrt{\frac {2*58}{9.8}}[/tex]

[tex]\displaystyle d=40\cdot\sqrt{11.84}[/tex]

d = 137.6 m

The robot should hold the bucket at 137.6 m from the start of the field

Explanation:

Kinetic Energy

= 0.5mv²

= 0.5(900kg)(25m/s)²

= 281,250J.

Answer:

When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.

Explanation:

An atom has an equal quantity of positive and negative electric charges (the protons and electrons) when its electron and proton counts are equal (the protons). Since the atom has a total electric charge of zero, it is referred regarded as being neutral.

The atom is the smallest unit of matter that may be divided without resulting in electrically charged particles. Additionally, it is the tiniest substance with features like chemical elements. The atom is therefore the basic building block of chemistry.

Examine different electron arrangements in the electron shells that surround an atom's nucleus.

Examine different electron arrangements in the electron shells that surround an atom's nucleus. The rest is made up of a cloud of negatively charged electrons surrounding a positively charged nucleus made up of protons and neutrons. Compared to electrons, which are the lightest charged particles in nature, the nucleus is small and dense.

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Answer:Inertial mass

Explanation:When we measure gravitational mass we find the strength of an object's interaction with a gravitational field.

When we measure inertial mass we find an object's resistance to being accelerated by a force.

An object's gravitational mass and inertial mass are the same.

We apply a force and measure the resulting acceleration, so we can use Newton’s second law to find the inertial mass.

Answer:

Explanation:

The force supplied by the train can be found by using the formula

[tex]f = \frac{w}{d} \\ [/tex]

w is the workdone

d is the distance

From the question we have

[tex]f = \frac{578000}{960} \\ = 602.083333...[/tex]

We have the final answer as

Hope this helps you

The force supplied by the train is 602.1 N.

This can be defined as the product of mass and the acceleration of a body.

To calculate the amount of force supplied by the train, we use the formula below.

Formula:

Where:

Make F the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, The force supplied by the train is 602.1 N.
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Answer:

t  =  1,28 s

Explanation: This problem is a projectile motion problem.

V₀ₓ = V₀ * cosθ

Vₓ  = constant all the way

Vₓ = V₀ₓ

tanθ  = Vyi/Vxi            that means in any point of the trajectory

tanθ  = 6 / 60         ( just before touching the ground )

tanθ  =  0,1       then arctan 0,1  ≈ 6⁰

sin 6⁰  =  0,1045

cos 6⁰ = 0,9945

V₀ₓ = V₀ * cosθ       ⇒  V₀  =  V₀ₓ / cosθ     ⇒  V₀  = 60 / 0,9945

V₀ = 60,33 m/s

V₀y = V₀  *  sin θ   ⇒   V₀y =  60,33 * 0,1045    ⇒  V₀y =  6,30 m/s

Vy = V₀y  - g * t

At  maximum y  Vy = 0    ( the middle of the trajectory)

g*tm = V₀y       ⇒    tm= V₀y / g

tm =  6,30 / 9,8

tm =  0,64 s       ( time to reach maximum y )

Then the time of fligh is twice 0,64 s

t   = 0,64 * 2

t  =  1,28 s