I need HELP ASAP please!!!

Newton's second law and the kinematics of rotation allow us to find the angular velocity of the snowball as it rolls across the roof is:

          w = [tex]\frac{2g}{R}[/tex]  

The kinematics of rotational motion studies the rotational motion of bodies.

           w = w₀ + 2 α θ

Where w and w₀ are the current and initial angular velocities, α the angular acceleration and θ the angle traveled.

Newton's second law establishes a relationship between the force, mass, and acceleration of the body.

The linear and rotational moviments are related.

             a = α R

Where a and α are the linear and rotational accelerations, respectively, and R is the radius of the body.

Let's find the linear acceleration of the body, in the attached we see a diagram of the forces, let's use trigonometry to decompose the weight.

            [tex]sin \theta = \frac{W_x}{W}[/tex]

            Wₓ = W sin θ

            Wₓ = m a

            mg sin θ = m a

            a = g sin θ

Now we can find the angular acceleration.

         α = a / R

         α = [tex]\frac{g}{ R \ sin \theta }[/tex]  

The body is released therefore its initial velocity is zero, we substitute in the kinematics expression.

          [tex]w = 2 ( \frac{g}{R \ sin \theta }) \ \theta[/tex]  

in rotational motion the angles are measured in radians  We use trigonometry to find the relationship between the angle and the distance traveled

             [tex]\theta = \frac{h}{D}[/tex]  

Where h is the height of the ceiling and D is the distance traveled.   Let's substitute.

           [tex]w = 2 \frac{g}{R sin \theta } \frac{h}{D}[/tex]

Let's tirgonmetry.

         sin θ = [tex]\frac{h}{D}[/tex]

         w = [tex]\frac{2g}{R}[/tex]

In conclusion, using Newton's second law and the kinematics of rotation, we can find the angular velocity of the snowball when rolling on the roof is:

          w = [tex]\frac{2g}{R}[/tex]

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15.9 N

Explanation:

Let's assume that the downward direction on the inclined is the (+)-direction. Since the block is in equilibrium, the x-component of its weight is pointing in the +x-direction and the frictional force [tex]f_s[/tex] is pointing up the incline. So the net force acting parallel to the incline can be written as

[tex]mg\sin36 - f_s = 0 \Rightarrow \mu N = mg\sin36[/tex]

where N is the normal force.

The net force perpendicular to the incline can be written as

[tex]N - mg\cos36 = 0 \Rightarrow N = mg\cos36[/tex]

or

[tex]N = (2\:\text{kg})(9.8\:\text{m/s}^2)\cos36 = 15.9\:\text{Newtons}[/tex]

Answer:

1 Proton, 1 Electron, No Neutrons

Group 1, Period 1

Gases

Answer:

look at the photo........................

Answer:

4.46 is the correct answer

Explanation:

Answer:

3.5 m/s

Explanation:

Answer:

a) Wnet = 0

b) W, = 32.9mJ

c) Wresistance = -32.9mJ

Explanation:

in pic

________________________

(hope This helps can I pls have brainlist (crown)☺️)

Answer:

Explanation:

Let the initial velocity of the two moving balls be u

Let the mass of one ball be m

Let the velocity after collision be v

Initial kinetic energy is

2(½mu²) = mu²

Assuming the 35° is measured above and below a common axis,

conservation on momentum.

the vertical portion of that velocity and momentum will be equal and will cancel out.

the horizontal momentum will be

m(ucos35) + m(ucos-35) + m(0) = 3mv

v = (2/3)ucos35 = 0.5461u

final kinetic energy is

½(3m)(0.5461u²) = 0.44734mu²

so the fraction of kinetic energy converted to heat energy is

(mu² - 0.44734mu²) / mu² = 0.5526599... = 0.55

Answer:

Explanation:

1.5(20) = 30 mm

Answer:

I think it expands

Explanation:

Answer:

E. remain unchanged

Explanation:

Analog signals and storage are used in most modern electronics is a false statement.

Analog signals and storage are not used in most modern electronics because analog signals are used in old instruments and technologies while on the other hand, in modern electronics digital signals and storage system are used that have higher speed, compatibility and space for storage.

Analog signals and storage were used in old electronics and can't be used in modern electronics due to non-compatibility so we can conclude that digital signals and storage are used in modern electronics.

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hindi ko po alam yan sorry po

The definition of centripetal acceleration allows to find the result for the linear velocity of the body is:

        v = 2.99 m / s

Kinematics studies the movement of bodies, the centripetal acceleration is the acceleration that a body has where all the energy is used to change the direction of the speed, leaving its modulus constant.

         [tex]a= \frac{v^2}{R}[/tex]  

Where a is the acceleration ccentripette, v the modulus of the velocity and R the radius of gyration.

They indicate that the radius is R = 4.2 m and the centripetal acceleration is a = 2.13 m / s, let's find the modulus of the velocity.

        [tex]v= \sqrt{a R}[/tex]

Let's calculate

        v = [tex]\sqrt{2.13 \ 4.2}[/tex]

        v = 2.99 m / s

In conclusion using the definition of centripetal acceleration we can find the result for the tangential velocity of the body is:

        v = 2.99 m / s

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Answer:

The factors that affect how an object moves through the air are force, friction, interia, and momentum.

Explanation:

Answer:

Explanation:

If the car is 100% efficient , it could travel a

distance of 900 metres on a single battery charge.

1800 J = 2 N•d m

d = 900 m

Answer:

Explanation:

s = ½at²

a = 2s/t²

a = 2(11.6) / 9.8²

a = 0.2415660...

a = 0.24 m/s²

Acceleration of the wagon is 0.241 m/s²

Force exerted on the wagon, F = 81.17 N

Displacement of the wagon, S = 11.6 m

Time taken by the wagon to travel this distance, t = 9.8 s

Using the second equation of motion,

S = ut + 1/2 at²

where u is the initial velocity and a is the acceleration of the wagon.

Since the wagon was initially at rest, u = 0.

So,

S = 1/2 at²

Therefore acceleration of the wagon,

a = 2S/t²

a = 2 x 11.6/(9.8)²

Acceleration, a = 0.241 m/s²

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We have several questions about gravity, the answers are:

The first question is, what is gravitation?

We define gravitational force as the attraction force between two objects with mass. From this, we can see that the correct option is:

"the attraction of any two objects because of their mass"

The second question is, which of the following was discovered by Newton?.

Newton concluded that the forces between objects with masses were what defined the orbits in the solar system, so the correct option here is:

"Gravity keeps the planets in their orbits."

The third question is: How the gravitational constant was first determined?

It was originally measured by Cavendish in 1978, he actually measured Earths density, and by knowing that the acceleration was roughly 9.8m/s^2, he could estimate the constant, so here the correct option is:

"by knowing that the acceleration caused by gravity is 9.8 m/s/s"

The fourth question is: The force of gravity between any two ordinary objects on the earth is?

Remember, gravity is an attractive force that depends on the mass of the objects. Here the only option that is always correct is:

"stronger if the objects are more massive"Question 5:Here the correct option is:"

For question 5 we have that the correct one is:

"The space station exerts a force on the earth toward the space station" Gravity acts on both objects, the earth and space station, just that the planet has a lot more mass than the space station, thus the force that it causes in the planet is negligible.

Question 6:

Gravity increases linearly with mass and decreases quadratically with distance, so if we double the mass and the radius, we can expect that the gravity at the surface to be near half of that one we have on Earth, then the correct option is:

"one half as much as Earth."

Question 7:

Again, force decreases with distance squared, then if you are closer to the planet, let's say, at sea level, the force will be greater than if you are on top of a mountain. The correct option is:

"The force of the earth's gravity on an object at sea level is stronger than at the top of a mountain."

Question 8.

By definition of gravitational field, the correct option is the last one:

"a region of space-time with a property at each point determined as the gravitational force on any object divided by its mass"

Question 9:

The field defines the force, thus the arrows should point in the same direction that the force acts, the correct option is:

"field vector arrows pointing in the direction of the gravitational force."

Question 10:

The correct option is 2.5 N/kg

Notice that N/kg = m/s^2

To get this, you just need to compute the 25% of Earth's gravitational acceleration.

Question 11:

The correct option is:

"the way an object with mass placed on a surface bends the surface"

Gravity is thought as a deformation in the space plane.

Question 12:

We just multiply the mass by the field:

10kg*3.5 N/kg = 35N

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Answer:

1) the unit of power is A.Watt

2)100J=50W

100=50s

divide both sides by 50s

S=2s(A)

The characteristics of the gravitational potential energy allows to find the results for the energy change when climbing the stairs are:

Potential energy is a configuration energy of the system, the system has the ability to perform work. The gravitational potential energy is:

           U = mg y - U₀

Where U is the gravitational potential energy and m the mass of the body, g the acceleration of gravity and y the height, Uo is the zero of the energy that must be defined for each case.

Indicates that the body rises a height of y = 346 m, the energy increases.

         ΔU = U-U₀ = m g y

         ΔU = m 9.8 346

         ΔU = 3390.8 m

Where m is the mass of the body. If we assume that the mass is m = 1kg.

         ΔU = 3390.8 J

This energy is due to the height therefore it is due to the configuration of the system, consequently it is a configuration energy.

In conclusion, using the characteristics of gravitational potential energy we can find the results for the energy change when climbing the stairs are:

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Answer:

Melon

Explanation:

The melon will hit the ground first because it has a greater mass and therefore greater gravitational pull than the pomegranate, which weighs less.

Both  melon and the pomegranate will reach the ground at the same time

The force between all masses in the universe, especially the force of the earth's mass for bodies near its surface is called gravitational force

Both  melon and the pomegranate will reach the ground at the same time ,because melon is heavier hence it will have greater gravitational force on it but it will also has lower acceleration but pomegranate have lighter mass hence will have  lower gravitational force but have higher acceleration , so these two effects will cancel each other and allow both melon and pomegranate to reach the ground at  same time .

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This question involves the concepts of kinetic energy, escape velocity, and rms speed.

a) The rms speed of hydrogen atom at 5800 K is "11991 m/s".

b) The escape velocity for the Sun is "6.18 x 10⁵ m/s".

a)

We will use the formula of the average kinetic energy of gas molecules to find out the rms speed of the hydrogen atom. rms speed is the root mean square speed of an atom:

[tex]K.E = \frac{3}{2}KT=\frac{1}{2}mv^2\\\\v=\sqrt{\frac{3KT}{m}}[/tex]

where,

v =rms speed = ?

K = Boltzman's Constant = 1.38 x 10⁻²³ J/k

T = absolute temperature = 5800 k

m = mass of hydrogen atom = 1.67 x 10⁻²⁷ kg

Therefore,

[tex]v=\sqrt{\frac{3(1.38\ x\ 10^{-23}\ J/k)(5800\ k)}{1.67\ x\ 10^{-27}\ kg}}[/tex]

v = 11991 m/s

b)

The escape velocity of the Sun is given by the following formula:

[tex]v_e=\sqrt{\frac{2GM}{R}}[/tex]

where,

ve = escape velocity = ?

G = Gravitational Constant = 6.673 x 10⁻¹¹ N.m²/kg²

M = Mass of Sun = 1.99 x 10³⁰ kg

R = radius of Sun = 6.96 x 10⁸ m

Therefore,

[tex]v_e=\sqrt{\frac{2(6.673\ x\ 10^{-11}\ N.m^2/kg^2)(1.99\ x\ 10^{30}\ kg)}{6.96\ x\ 10^8\ m}}[/tex]

[tex]v_e = 6.18\ x\ 10^5\ m/s[/tex]

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Answer:

Diaplacement s=1.80km

Final velocity v=360km/h

It starts from rest. So, initial velocity u=0

We need to find the constant acceleration (a).

using the equation of motion v

2

=u

2

+2as

360

2

=0

2

+2×a×1.8

a=

3.6

360×360

a=36000km/h

2

Answer:

the answer is 343/9.8=35

Explanation:

the answer is 35 because mass=weight/gravity

The mass of a person who weighs 343 N is 35.0 kg.

The most fundamental characteristic of matter is mass, which is one of the fundamental quantities in physics. Mass is a term used to describe how much matter is there in a body. The kilograms is the SI unit of mass (kg).

Weight is a measurement of how much gravity is pulling on a body.

The weight formula is as follows: w = mg

Since weight is a force, it has the same SI unit as a force, which is the Newton (N). It depends on both mass and the acceleration caused by gravity.

The weighs of the person is = 343 N

The mass of the person is = weighs of the person ÷ acceleration due to gravity

= 343 N ÷ 9.80 m/s²

= 35.0 kg.

Hence, the mass of the person is 35.0 kg.

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Answer:

The Force Of Gravity

I think it's a) 1st Newton's law... so sorry if it's wrong...

Answer:

Past  

I walked home.

She studied.

He made a list.

Present

She walks home.

They leave the door open.

Future

She will walk home.

It will open next week.

Explanation:

Answer: One over par

Answer:

Dear questioner;

Paddington's Answer is One over par that's he see in his book and Aunt Lucy help him

Answer:

5m and 15m

Explanation:

This question involves the concepts of the law of conservation of energy, kinetic energy, potential energy, and moment of inertia.

The angular velocity of the solid sphere at this point is "95.44 rad/s".

According to the law of conservation of energy:

Loss in Potential Energy = Gain in Rotational Kinetic Energy + Gain in Translational Kinetic Energy

[tex]mgh = \frac{1}{2}I\omega^2+\frac{1}{2}mv^2[/tex]

where,

m = mass of sphere

g = acceleration due to gravity = 9.81 m/s²

h = loss in height = (270 cm) Sin 37° = 162.5 cm = 1.625 m

r = radius of sphere = 5 cm = 0.05 m

ω = angular speed of sphere = ?

v = linear speed of sphere = rω

I = moment of inertia of sphere = [tex]\frac{2}{5}mr^2[/tex]

Therefore,

[tex]mgh=\frac{1}{2}\frac{2}{5}mr^2\omega+\frac{1}{2}m(r\omega)^2\\\\gh=\frac{1}{5}r^2\omega^2+\frac{1}{2}r^2\omega^2\\\\(9.81\ m/s^2)(1.625\ m)=(\frac{1}{5}+\frac{1}{2})(0.05\ m)^2\omega^2\\\\\omega=\sqrt{\frac{15.941\ m^2/s^2}{0.00175\ m^2}}[/tex]

ω = 95.44 rad/s

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The attached picture explains the law of conservation of energy.