Pleasssseeee helpppp i will mark brainlest

Answer:

f = 0.75 Hz

Explanation:

It is given that, a person is kicking there legs three times every four seconds. We need to find his frequency. The number of times an event is occurring is called frequency of an object. The frequency of a person is given by :

[tex]f=\dfrac{n}{T}\\\\f=\dfrac{3}{4}\\\\f=0.75\ Hz[/tex]

So, the frequency of the person is 0.75 Hz.

Answer:

Only kinetic.

Explanation:

Potential energy means it has the potential to move. Not something already in motion.

Answer:

yes

Explanation:

it hasn't stopped moving so it still has kinetic energy and it hasn't reached what is considered 0 so yes it has both potential and kinetic energy

if you need more of an explanation let me know and ill fix it

Answer: Solenoid

Explanation:

Answer:

Solenoid

Explanation:

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:

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.

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:

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: 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:

https://brainly.com/question/12807194

#SPJ5

Explanation:

lighting converts heat energy.

hope you like this .

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:

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:

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: 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:

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:

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:

https://brainly.com/question/14049417

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:

d

Explanation:

when one variables is zero ,the other is also zero

Answer:

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

Answer:

Fc = 19.2 N

Explanation:

In this case, the force of the Honda over the rock, is a centripetal force. Then, you have:

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

m: mass of the rock = 600g = 0.6 kg

v: tangential velocity of the Honda = 4m/s

r: radius of the Honda = 50cm = 0.5m

You replace the values of m, r and v in the equation for Fc:

[tex]F_c=(0.6kg)\frac{(4m/s)^2}{0.5m}\\\\F_c=19.2N[/tex]

hence, the force has a magnitude of 19.2 N

If the rock would have more mass the centripetal force would be higher

Answer:

newton(N)

Explanation:

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: It is due to the low air pressure in the stopper and the atmospheric pressure.

Explanation: Whenever is there is a pressure, there must be a force exerted. Because,

Pressure = Force/ Area

So, when the bulb of the dropper is squeezed, the air pressure inside the dropper decreases because all the air is forced out.

When the dropper is placed in a liquid and the squeezed bulb is released, the air pressure outside the stopper surrounding the liquid becomes high and forces the liquid inside the dropper.

The rise of the liquid into the stopper is due to the atmospheric pressure.

This is similar to drinking liquids using a straw.

Answer:

84.4 %

Explanation:

Mechanical efficiency = output work/input work × 100 %

output work = 432 J of work for the bike to turn the gears

input work = 512 J of work to ride.

Mechanical efficiency =  432 J/512 J × 100 %

= 0.844 × 100%

= 84.4 %

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:

B

Explanation:

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

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:

a. 38400j

Explanation:

p= mgh

2400×10×1.6

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: