A body is moving vertically upwards. It’s velocity changes at a constant rate from 50m/s to 20m/s in 3 sec. What is it’s acceleration ?

Answer:

W=F×H,Power=W/Time

Explanation:

W=Force ×Height

750N×16 =12000

Power=Work/Time

12000/5=2400J

Answer:

194 kg m²

Explanation:

Use parallel axis theorem:

I = I₀ + mr²

I = 25 kg m² + (1 kg) ((5 m)² + (12 m)²)

I = 25 kg m² + 169 kg m²

I = 194 kg m²

Answer:

a. 38400j

Explanation:

p= mgh

2400×10×1.6

If a car travels 20 miles in 1 hour and 15 minutes, then the average speed of the car would be 7.15 meters/second.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.

As given in the problem, if a car travels 20 miles in 1 hour and 15 minutes, then we have to find the average speed of the car,

1 mile = 1609 meters

20 miles = 20*1609 meters

              = 32180 meters

1 hour = 3600 seconds

1 minutes = 60 seconds

15 minutes = 15*60

                  =900 seconds

1 hour and 15 minutes = 4500 seconds

The average speed of the car = The distance traveled by car/time

                                                  = 32180 meters / 4500 seconds

                                                  = 7.15 meters / seconds

Thus, the average speed of the car would be  7.15 meters/second.

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Answer:

newton(N)

Explanation:

Answer: Impulse of force is a process of reducing and minimizing the impact of force on the object.

Explanation:

If an impact stops the moving object then the change in momentum will become a fixed quantity, extending the time of collision and reducing the time of impact.

For example, If a person jumps to the ground with a certain height the person will bend knees to extend the time of collision while hitting the ground and reducing the time of impact to prevent much injury.

Answer:

Сила тока 0.994 А

Explanation:

Параметры приведены ниже;

Время = 4 часа = 14 400 с

Масса выпущенного серебра = 16 г

Электрохимический эквивалент серебра = 1,118 мг / с

Формула для количества электричества Q дается следующим образом;

Q = I × t

Куда;

I = ток (A)

t = время в секундах, с

Масса m, образующаяся при электролизе, определяется соотношением;

[tex]m = E_c \times Q = E_c \times I \times t[/tex]

Куда;

[tex]E_c[/tex] = Электрохимический эквивалент серебра = 1,118 мг / с

м = 16 г

Подставляя значения, мы имеем;

Который дает;

[tex]I = \dfrac{16}{1.118 \times 10^{-3} \times 14,400} = 0.994 \, A[/tex]

Следовательно, сила тока = 0,994 А.

Answer:

[tex]F=F_{f}=1171.5 N[/tex]

Explanation:

We know that the sailboat has a uniform movement, therefore the total force, the engine, and the wind must be equal to the friction force.

[tex]F=F_{f}[/tex]

[tex]F=F_{f}=\sqrt{F^{2}_{engine}+F^{2}_{wind}}[/tex]

[tex]F=F_{f}=\sqrt{900^{2}+750^{2}}[/tex]

[tex]F=F_{f}=1171.5 N[/tex]

Therefore the friction force is 1171.5 N.

I hope it helps you!

Answer:

 freezing melting sublimating  x y

 x and

Explanation:

To drop a table of states of matter the best headings must be

table name: matter state

    freezing melting sublimation x y

This order goes from the solid state to the gaseous state, which is obtained by introducing heat into the system

Answer: D on edge

X: Heat Is Absorbed

Y: Heat Is Released

Explanation:

sublimation and melting are both absorbing heat(aka getting warmer)as they change state while freezing and deposition are releasing heat(aka getting colder)as they change state

Answer:

electrical conductivity in liquid solutions depends on the availability of free ions.

Answer:

d

Explanation:

when one variables is zero ,the other is also zero

Answer:

It is an example of kinetic art motion

Explanation:

Alexander caders's mobile was made by an American sculptor called Alexander Cader. He made innovative kinetic mobile sculptures that use that uses motor or air currents.

Alexander caders's mobile is a kinetic sculptures because movement is it's basics. The sculptures is well moved by air currents. The Alexander cader mobiles make movement as integral part of the design of the sculpture.

Answer:

E=72000J or 72kj

Explanation:

The formula is E=pt you need to convert your t from minutes to seconds before proceeding

Answer: A. Reference point

Explanation: A reference point is usually the start of a location, and if it's a starting point, then it will be 0.

Have a nice day. :)

Answer:

electrostactic force mean a force exerted from a charged object

eg :- a charged comb

Explanation:

hope this helps u stay safe

Explanation:

electrostatic force is the force that exist between electrically charged particle object at rest .

example of electrostatic force :- when we run a piece of paper with the oil in our head with the help of comb produced electrostatic force.

Answer:

The forces acting on the pen which is still on the table can have two forces acting on them.  The forces are gravitational force and the equal and opposite force to the gravitational forces.

The equal and opposite forces that is applied on the pen keeps the pen still on the table.

So, the statement that no force is applied on the pen which is kept still on the table is wrong as two forces are applied on the pen.

As both the forces are equal and opposite so it is cancelled and is still.

Explanation:

lighting converts heat energy.

hope you like this .

Answer:

7572 m/s

Explanation:

The force between two masses separated by a distance r is given as:

[tex]F=G\frac{m_1m_2}{r^2}[/tex]

Where F is the attractive force between 2 masses, m1 and m2, r is the distance between the centres of the masses and G is the universal gravitation constant, which is [tex]6.674*10^-11 Nm^2/kg^2[/tex]

The mass of the earth ([tex]m_1[/tex]) is far greater than the mass of the sputnik ([tex]m_2[/tex]). Therefore [tex]m_1m_2=m_1[/tex]. The mass of the sputnik is neglected, therefore:

[tex]F=G\frac{m_1}{r^2}=\frac{(6.674*10^{-11})(5.98*10^{24})}{(6.96*10^6)^2} = 8.2389N[/tex]

But F is actually centripetal acceleration, a = v²/r

[tex]8.2389 = v^2 / 6.96*10^6\\v=7572m/s[/tex]

Answer:

Transverse waves

Explanation:

Transverse waves are a type of wave that oscillates perpendicular to the direction of movement (the direction of propagation). These type of waves are usually represented by the sine or cosine functions due to the up and down oscillation of the waves.

In the case of water waves the thing that oscillates up and down are the water particles affected by the disturbance.

And for the case light waves what oscillates are the electric and magnetic fields, both oscillating perpendicular to the direction of light propagation.

Answer:

2 meter per second

Explanation:

kinetic energy = 1/2 m v^2

20J = 1/2 × 10 × v^2

v^2 = 4

v= 2 m/s

Answer:

The frequency of an ocean wave is 15 Hz.  

Explanation:

We are given with, the speed of an ocean wave is 45 m/s. Its wavelength is 3 m

It is required to find the frequency of an ocean wave.

The speed of a wave is given in terms of frequency and wavelength as :

[tex]v=f\lambda[/tex],

f = frequency of ocean wave

[tex]f=\dfrac{v}{\lambda}\\\\f=\dfrac{45}{3}\\\\f=15\ Hz[/tex]

So, the frequency of an ocean wave is 15 Hz.

Answer:

f = 10 Hz

Explanation:

We need to find the frequency of a wave if 10 waves go past in 1 second. Total number of waves per unit time is called frequency. So,

[tex]f=\dfrac{10}{1}=10\ Hz[/tex]

So, the frequency of a wave is 10 Hz.

Answer: 71 J

Explanation: The formula for gravitational potential energy is Epg= mgh.

So you plug in 2.2 as m, 3.3 as h and 9.81 as g. Once you do that you should get an answer of 71.2206. But because there are only two significant digits in the question, your answer must also have two significant digits.

The gravitational potential energy of the rock of 2.2 kg that is 3.3 m above the river is 71 J. The potential energy of the rock when measured from the edge of the bridge is zero where because rock is resting in the edge itself , so height will be zero.

Potential energy of an object is the energy generated by virtue of its position. Thus the energy is stored on the object when it rest. The energy stored on it when it is in a gravitational field is called its gravitational potential energy.

The gravitational potential energy of an object is given as follows;

p = mgh

where h is the height from the surface.

Given mass of the rock, m = 2.2 Kg

height = 3.3 m

g = 9.8 m/s²

then, p = 2.2 kg × 3.3 m ×  9.8 m/s² = 71 J.

Therefore, the gravitational potential energy of the rock is 71 J.

Find more on potential energy:

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Answer:

Mass = 386 kg

Explanation:

Density = Mass / Volume

Mass = Density × Volume

Where D = 19300 kg/m³ , V = 0.02 m³

Putting the given in the above formula

Mass = 19300 × 0.02

Mass = 386 kg

Answer:

386 kg

Explanation:

mass = density * volume

= 19300 * 0.02

= 386 kg

Hope this helps!

Answer:

858.7 N

Explanation:

The magnetic force on the charge F = Bqv where B = magnetic field strength = 4.02 mT = 4.02 × 10⁻³ T, q = charge = 7.12 μC = 7.12 × 10⁻⁶ C and v = c = speed of light = 3 × 10⁸ m/s

F = Bqc

=  4.02 × 10⁻³ T × 7.12 × 10⁻⁶ C × 3 × 10⁸ m/s

= 858.7 N

Answer:

B

Explanation:

The picture shows 'O' for oxygen and is surrounded by six dots that represent valence electrons.

Answer:

The new force is 16 times of the initial force.

Explanation:

The electric force between charges is given by :

[tex]F=\dfrac{kq_1q_2}{r^2}[/tex]

If the distance is halved, d' =d/2 and charges are doubles, [tex]q_1'=2q_1\ \text{and}\ q_2'=2q_2[/tex]

New force becomes,

[tex]F'=\dfrac{kq_1'q_2'}{r'^2}\\\\F'=\dfrac{k(2q_1)(2q_2)}{(d/2)^2}\\\\F'=16\times \dfrac{kq_1q_2}{r^2}\\\\F'=16F[/tex]

So, the new force is 16 times of the initial force.

If the distance is halved and the charges of both particles are doubled, the force is 16 times as great.

According to Coulomb's law, the electrostatic force between two charges is given by;

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

Where 'k' is the Coulomb's constant.

If the charges of both particles are doubled and the distance is halved, the new force will be;

[tex]F\,'=k\frac{2q_1 \times 2q_2}{(r/2)^2}=k \frac{4\times 4\times q_1 q_2}{r^2} =16\,F[/tex]

So, the new force will be 16 times greater than the old force.

Learn more about Coulomb's law here:

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Answer:

The correct answer to the following question will be "2.7 m".

Explanation:

The given values are:

Velocity, v = 16 m/s

mass, m = 0.27 kg

Mechanical energy, M.E = 41.70 J

g = 9.8 m/s²

As we know,

Kinetic energy, [tex]K=\frac{mv^2}{2}[/tex]

Potential energy, [tex]U=m.g.h[/tex]

Now, the total mechanical energy will be:

⇒  [tex]\frac{mv^2}{2}+U[/tex]

⇒  [tex]41,71 \ kg.m^2/s^2[/tex]

Now,

⇒  [tex]h=\frac{E-(\frac{mv^2}{2})}{mg}[/tex]

On putting the estimated values, we get

⇒    [tex]=\frac{41.70-(\frac{0.27(16)^2}{2})}{0.27\times 9.8}[/tex]

⇒    [tex]=\frac{41.70-(\frac{0.27\times 256}{2} )}{2.64}[/tex]

⇒    [tex]=\frac{41.70-34.56}{2.64}[/tex]

⇒    [tex]=\frac{7.14}{2.64}[/tex]

⇒    [tex]=2.7 \ m[/tex]

Answer:

2.7 m

Explanation: