PLEASE HELP!! I WILL GIVE you 20+ brainly

change in momentum = 37,500kg.m/s in the opposite direction

time it takes = 12.5s

u=25m/s

v=0m/s

F=ma

-3000=(1500)(a)

-3000÷1500=a

a= -2m/s^2

Change in momentum=mv-mu

(1500)(0)-(1500)(25)

= -37,500kg.m/s

relax the( - ) represents direction

v=u-at

0=25-2t

2t=25

t= 12.5s

Answer:

the reaction is a physical reaction and it is exothermic as it releases heat to the sorrounding

Explanation:

because the mass of paper burnt is equal to the mass of products which are ashes

Answer:

Microwaves (D

Explanation:

I'm not sure! But I think it's Microwaves!

Answer:

(a). The value of distance is 5.043 m

(b). The coefficient of friction is 0.302.

(c). The distance is 10.33 m

Explanation:

Given that,

Speed = 4.50 m/s

Minimum friction = 0.1

Maximum friction = 0.6

Distance = 12.5 m

We know that,

The newton's second law

[tex]F_{net}=-\mu N[/tex]

[tex]F_{net}=-\mu mg[/tex]

We know that,

The frictional coefficient is directly proportional to the distance.

We need to calculate the value of coefficient

Using general equation of frictional coefficient

[tex]\mu(x)=Ax+B[/tex]....(I)

At x= 0,

[tex]\mu(0)=0+B[/tex]

Put the value into the formula

[tex]B=0.1[/tex]  

Now for value of A

Put the value in equation (I)

[tex] 0.6=A12.5+0.1[/tex]

[tex]A=\dfrac{1}{25}[/tex]

Put the value in equation (I)

[tex]\mu(x)=\dfrac{x}{25}+0.1[/tex]......(II)

We need to calculate the work done

Using work energy theorem

[tex]W=\int_{0}^{x}{F_{net} dx}[/tex]

[tex]W=\int_{0}^{x}{-\mu_{x}mgdx}[/tex]

[tex]W=-mg\int_{0}^{x}{(\dfrac{x}{25}+0.1)dx}[/tex]

[tex]W=-mg(\dfrac{x^2}{50}+0.1x)[/tex]....(III)

(a). We need to calculate the distance

Using difference of kinetic energy

[tex]W=\dfrac{1}{2}m(v_{f}^2-v_{0}^2)[/tex]

[tex]-mg(\dfrac{x^2}{50}+0.1x)=\dfrac{1}{2}m(0-(4.50)^2)[/tex]

[tex]\dfrac{x^2}{50}+0.1x=1.013[/tex]

[tex]x^2+5x=50.65[/tex]

[tex]x^2+5x-50.65=0[/tex]

[tex]x=5.043\ m[/tex]

(b). We need to calculate the coefficient of friction at the stopping point

Using equation (III)

[tex]\mu(5.043)=\dfrac{5.043}{25}+0.1[/tex]

[tex]\mu(5.043)=0.302[/tex]

(c). We need to calculate the distance

Using formula work done

[tex]W=-fx_{2}[/tex]

[tex]W=-\mu mgx_{2}[/tex]

[tex]-\dfrac{1}{2}mv_{0}^2=-\mu mgx_{2}[/tex]

[tex]x_{2}=\dfrac{v_{0}^2}{2\mu g}[/tex]

Put the value into the formula

[tex]x_{2}=\dfrac{(4.5)^2}{2\times0.1\times9.8}[/tex]

[tex]x_{2}=10.33\ m[/tex]

Hence, (a). The value of distance is 5.043 m

(b). The coefficient of friction is 0.302.

(c). The distance is 10.33 m

C. Disregard a goal if you don’t achieve it

Answer: A. Disregard a goad if you don't achieve it.

Explanation:

The Explanation is if you don't achieve the goal that is not right so your job is to disregard the goal.

The mystery element on the periodic table that have melting point of 725.05c , that is malleable, good conductor of heat is Barium.

Periodic table is the table that shows the classification of elements into groups and periods which classify them base on their unique and comon characteristics within each group.

Therefore, The mystery element on the periodic table that have melting point of 725.05c , that is malleable, good conductor of heat is Barium.

Learn more about periodic table below.

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Force on the particle is defined as the application of the force field of one particle on another particle. the electrical force between q₁ and q₃ will be –1. 1 × 10¹¹ N.

Force on the particle is defined as the application of the force field of one particle on another particle. It is a type of virtual force.

The electric force in the second case will be the same as in the first case. Therefore the force on the particle will be the same.

[tex]\rm F= K\frac{q_2q_3}{r^2}[/tex]

[tex]\rm F= 9\times 10^9 \times \frac{1.6 \times 10^{-13}\times 1.6\times10^{-13}}{(0.5)^2}[/tex]

[tex]\rm F= - 1. 1 \times 10^{11 }N[/tex]

Hence the electrical force between q₁ and q₃ will be –1. 1 × 10¹¹ N.

To learn more about the electric force refer to the link;

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Answer:

The ball will continue to move at a constant speed forever until another force stops it.

Explanation:

Newton's first law of motion can be seen as a law of inertia. It explains that an object at rest or in a state of uniform motion will remain in that state unless it is acted upon by an external force.

Following the above, when the ball is thrown into space, the ball will continue to move with the velocity with which it was thrown until it comes in contact with another object that stops it. If this does not happen, it will continue to drift forever at that velocity.

I believe that the correct answer is reactivity.

The word from the list that best fits the definition increases the number of sunspots that can lead to warmer climates.

Sunspots are transitory spots on the Sun's photosphere that appear to be deeper than the surrounding areas.

They are zones of reduced surface heat caused by magnetic field flux concentrations that prevent convection.

Sunspots usually form in pairs with opposite magnetic polarities. This has an impact on the temperature on Earth, as well as radio reaction. The Earth would presumably be colder if sunspots didn't exist.

When sunspots form, they produce an increase in UV radiation that radiates from the sunspots' outer ring as they approach Earth.

This increase in UV radiation has an impact on the chemistry of the outer environment as well as the Earth's energy balance.

The idea that sunspots have an impact on Earth's ecology is still controversial, although it does exist.

Hence the words from the list that best fits the definition increase the number of sunspots that can lead to warmer climates.

To learn more about the sunspot refer to the link;

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Answer:

louder sound.

Explanation:

The amplitude of a sound wave determines its loudness or volume. A larger amplitude means a louder sound

Answer:

Explanation:

The total surface area of the room is expressed as;

TSA = 2(LW+LH+WH)

L is the length

W is the width.

H is the height

Given

L = 4m

W = 3m

H = 2.5m

.TSA = 2{4(3)+3(2.5)+4(2.5)}

TSA = 2(12+7.5+10)

TSA = 2(29.5

TSA = 59m²

TSA (without the floor) = 2(3(2.5)+4(2.5))

TSA = 2(7.5+10)

TSA = 2(17.5)

TSA = 35m²

If a certain part covers 25 square meters per gallon, the amount of gallon needed will be 35m²/25m²

= 1.4gallons

The strength of the electric field will be 0.75 NC⁻¹.

The strength of the electric field is the ratio of electric force per unit charge. Its unit is NC⁻¹.

The given data in the problem is;

q is the positive charge = 6.0 × 10-4 C

F is the electric force of 4.5 × 10-4 N

E is the electric field intensity=?

The electric force is given by;

[tex]\rm F= q \times E \\\\ \rm E= \frac{F}{q} \\\\ \rm E= \frac{4.5 \times 10^4}{6 \times 10^{-4}} \\\\ \rm E=0.75 \ NC^{-1}[/tex]

Hence the strength of the electric field will be 0.75 NC⁻¹.

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Answer: A

Explanation: a p e x

Answer:

the guy above is right, it is A

Explanation:

A p E x

Answer:

The time of the second observer at the end of the car motion is 27 s

Explanation:

Initial time of the first observer, t₁ = 262 s

final time of the first observer, t₂ = 375 s

The time of the car motion, t = t₂ - t₁

t = 375 s - 262 s

t = 113 s

Initial time of the second observer, t₁ = -86 s

final time of the second observer, t₂ = ?

The time of the car motion, t = t₂ - t₁

113 = t₂ - t₁

113 = t₂ - (-86)

113 = t₂ + 86

t₂ = 113 - 86

t₂ = 27 s

Therefore, the time of the second observer at the end of the car motion is 27 s

Answer:

??? this makes no sense give more info

Explanation:

Answer:

The moon and sun cause tidal bulges to move around the planet in perfect sync and unison.

Explanation:

However, do not consider these to be large oceans of water moving in relation to continents. Only the fluctuations in water level—the water's surface profile—follow the moon's and sun's positions in the sky.

Answer:

I'm From Philippines

I hope we can be friends.

Answer:

t = 0.3 seconds

Explanation:

Given that,

Initial velocity of a ball, u = 3 m/s

Final velocity of the ball, v = 6 m/s

We need to find the time for which the ball is in the air. As the ball was directed upwards, it would mean that the acceleration of the ball is -g or -9.8 m/s².

Using the first equation of motion to find the time. So,

v=u+at

or

v=u-gt

[tex]t=\dfrac{v-u}{-g}\\\\t=\dfrac{6-3}{-9.8}\\\\t=-0.3\ s[/tex]

or

t = 0.3 seconds

So, the ball is in the air for 0.3 seconds.

Answer: t= 0.92 s

Explanation: the formula you use it’s v=vinitial + at and you rearrange it to make (t= vfinal - vinitial /a) using this you get 0.92s

P = F/A

P = 50/5

P = 10 Pa

Hope it helps :)

Option C is correct. Frequency can be found by counting the number of troughs per second in a wave diagram.

Frequency is defined as the number of repetitions of waves occurring in 1 second. It can also be said that Frequency is defined as the number of cycles completed in 1 second.

Frequency is given by the formula as,

[tex]\rm f=\frac{1}{t}[/tex] Hz.

Hence option C is correct. Frequency can be found by counting the number of troughs per second in a wave diagram.

To learn more about the frequency refer  to the link;

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Answer:

C is correct

Explanation:

Answer:

3.6×10⁶ m

Explanation:

g = GM / R²

4 m/s² = (6.67×10⁻¹¹ m³/kg/s²) (6×10²⁴ kg) / (6.4×10⁶ m + h)²

(6.4×10⁶ m + h)² = 1.00×10¹⁴ m²

6.4×10⁶ m + h = 1.00×10⁷ m

h = 3.6×10⁶ m

When using the right-hand rule to determine the direction of the magnetic force on a charge, the thumb is in the direction of the magnetic field.

The right-hand thumb rule is the method to recognize that there is only one velocity, which is symbolized by the thumb. There are a lot of field lines, which are symbolized by the fingers.

The force is directed in the direction in which you would press your palm. The force acting on a negative charge is the polar opposite of that acting on a positive charge.

A pure magnetic field will not accelerate a charged particle in a single direction since the force is always perpendicular to the velocity vector, but it will create circular or helical motion

It's worth noting that a magnetic field has no effect on a static electric charge. These two findings are consistent with the rule that magnetic fields are polarized.

Hence using the right-hand rule to determine the direction of the magnetic force on a charge, the thumb is in the direction of the magnetic field.

To learn more about the right-hand thumb rule refer to the link;

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Answer:

D, thumb

Explanation:

edge 2022

Answer:

Your answer is MASS.

Explanation:

Volume measures how much space an item takes up.

Temperature measures how hot or cold something is.

Density is the degree of compactness of a substance.

Mass measures the amount of matter in an object.

Complete Question

The complete question is shown on the first uploaded image

Answer:

The value  is [tex]v  = 3.57 \  m/s [/tex]

Explanation:

From the question we are told that

  The depth  is  [tex]d =  979 \  m[/tex]

   The time taken for water to fall to below the river is  [tex]t =  14 \ s[/tex]

   The  horizontal distance from the base of the vertical cliff is  [tex]h  =  50 \  m[/tex]

     Generally  the horizontal speed at the top is mathematically represented as

         [tex]v  =  \frac{h}{t}[/tex]

=>      [tex]v  =  \frac{  50}{ 14 }[/tex]

=>     [tex]v  = 3.57 \  m/s [/tex]

Answer:

181276.802 m

Explanation:

The computation of the horizontal range of the shell is shown below:

As we know that

range = u × usin2θ ÷ g

where,

u = 1600 m/s

θ = 68

g=9.81

Put these values to the above formula

So, the value of the horizontal range of the shell is

R = 181276.802 m

=  181276.802 m

We simply applied the above formula and the same is to be considered

Answer:

the average speed is ... 280 m / 8.00 s = 35 m/s

the initial speed is zero (rest), so the final speed (take off) is

... ave = (init + fin) / 2 ... 35 = (0 + f) / 2 ... f = 70 m/s

Explanation:

Answer:

Thank you ☺️☺️

Answer:

0.4 g/cm^3

Explanation:

As density=m/v

                =2.4/6

                =0.4g/cm^3