please give the answer

Answer:

Explanation:

angle covered in one rotation = 2π radian

θ = ωt + 1/2 αt²

θ is angle rotated in time t with initial angular velocity of ω and angular acceleration α .

Putting the values

2π = 0 + 1/2 x α x 3²

α = 1. 4 radian / s²

linear acceleration =  α x r = 1.4 x 1.5 = 2.1 m / s².

Initial acceleration = 2.1 m /s²

final angular velocity = α t = 1.4 x 3 = 4.2 radian / s

linear velocity = 4.2 x 1.5 = 6.3 m /s

centripetal acceleration = v² / R = 6.3² / 1.5 = 26.46 m /s²

radian acceleration = 26.46 m /s

tangential acceleration = 2.1 m /s²

Total final acceleration = √ ( 26.46² + 2.1² )

= √ ( 700.13 + 4.41)

Final acceleration = 26.53 m / s²

The kid will undergo a circular motion and the smartphone which has a built-in accelerometer will record the acceleration [tex]26.54 \,m/s^2[/tex], which is the magnitude of the vector sum of both radial acceleration and tangential acceleration.

The angle covered in one full rotation, i.e.; the angular displacement is,

[tex]\theta = 2\pi\,\, radian[/tex]

The kinematics equation in the case of rotational motion is given by;

[tex]\theta = \omega_i \,t + \frac{1}{2} \alpha t^2[/tex]

But the initial angular velocity, [tex]\omega_i = 0[/tex]

Time taken to complete one lap is, [tex]t = 3\,s[/tex]

Therefore, substituting the given values in the kinematics equation;

[tex]2\pi \;rad=0 + \frac{1}{2} \alpha\times (3)^2[/tex]

[tex]\implies \alpha = \frac{4 \pi\,\,rad}{9\,s^2} =1.395\,rad/s^2 \approx 1.4\,rad/s^2[/tex]

We know that linear acceleration (here tangential direction) is given by,

[tex]a_T=a = r \alpha = 1.5\,m \times 1.4\; rad/s^2=2.1\,m/s^2[/tex]

Also, the final angular velocity after 3 s is given by;

[tex]\omega_f = \alpha t=1.4\,rad/s^2 \times 3\,s = 4.2\,rad/s[/tex]

Therefore, the final linear velocity is;

[tex]v_f = r \omega = 1.5\,m \times 4.2\,rad/s = 6.3\,m/s[/tex]

We know that the centripetal or the radial acceleration is given by;

[tex]a_r = \frac{v^2}{r} = \frac{(6.3\,m/s)^2}{1.5m}=26.46\,m/s^2[/tex]

Therefore, the total acceleration is given by;

[tex]a_{total} = \sqrt{(a_T)^2 + (a_r)^2\,} =\sqrt{(2.1)^2 + (26.46)^2} =\sqrt{704.54} =26.54 \,m/s^2[/tex]

Learn more about circular motion here:

https://brainly.com/question/2562955

Answer:

66.053m/s

Explanation:

A = 47

B = 347

C = 19

Train moves at

(23 + A)m/s

= 23 + 47 = 60m/s

At (250.0+B) seconds

250.0+347 =

547 seconds

Distance d,

= 70 x 597

= 41790

It also moves at

(45.0 + c)

= 45 + 19

= 64m/s

Time = 800 + B

= 800 + 347

= 1147

Distance,

= 64 x 1147

= 73408m

Total distance,

= 73408 + 41790

= 115,198

Total time,

= 597 + 1147

= 1744

Average speed,

= Total distance / total time

= 115198/1174

= 66.053m/s

Answer: it would be A

Explanation: how are we to measure the air of a square mile

Answer: Should the government invest in technologies that can reduce the

rate of global warming?

Explanation: Trust me

Answer:

The distance traveled by the train is 691.2 m

Explanation:

Given;

initial velocity of the train, u = 32.9 m/s

deceleration of the train, a = - 0.783 m/s²

final velocity of the train when brought to a stop, v = 0

The distance traveled by the train is given by;

v² = u² + 2as

0 = (32.9)² + 2(-0.783)s

0 = 1082.41 - 1.566s

1.566s = 1082.41

s = 1082.41 / 1.566

s = 691.2 m

Therefore, the distance traveled by the train is 691.2 m

Answer:

0.2246 meters

Explanation:

.25-0.0254 meters = 0.2246 meters

Answer:

E = 1.89 eV ,   E = 2.56 eV ,  E = 2.86 eV

Explanation:

The emission of light in the visible range, explained by the Balmer series with expression

            1 /λ= [tex]R_{H}[/tex] (1/2² - 1 / n²)

            n = 3, 4, 5 ...

the constant R_{H} called Rydberg's constant and is equal to 1,097 10⁷ m⁻¹

These transitions are clearly explained by Bohr's atomic model, where the empirical series of Balmer and Rydberg are deduced from a theoretical model of the hydrogen atom in natural form.

Let's calculate the wavelengths for each transition

State

initial   final  λ (10⁻⁷ m)

3           2     6.5634

4           2     4.8617

5           2    4.3408

Let's calculate the energy of each of these wavelengths using Planck's equation

          E = h f = h c /λ

λ = 6.5634 10⁻⁷ m

          E = 6.63 10⁻³⁴ 3 10⁸ / 6.5634 10⁻⁷

          E = 3.03 10⁻¹⁹ J

we reduce to eV

         E = 3.03 10⁻¹⁹ J (1 eV / 1.6 10⁻¹⁹ J)

         E = 1.89 eV

λ = 4.8617 10⁻⁷m

         E = 6.63 10⁻³⁴ 3 10⁸ / 4.8617 10⁻⁷

          E = 4.09 10⁻¹⁹ J

          E = 2.56 eV

λ= 4.3408 10⁻⁷ m

           E = 6.63 10⁻³⁴ 3 10⁸ / 4.3408 10⁻⁷

           E = 4.582 10⁻¹⁹J

           E = 2.86 eV

Answer:

a

   [tex]\theta  =  23.32^o [/tex]

b

  [tex] \mu_s =  0.27  [/tex]

c

[tex] s = 0.948 \ m [/tex]

Explanation:

From the question we are told that

The mass of the bag is [tex]m_b = 25.0 \ kg[/tex]

The normal force experienced is [tex]F_n = 225 \ N[/tex]

The maximum acceleration of the bag is [tex]a = 2.40 \ m/s^2[/tex]

Generally this normal force experience by the bag is mathematically represented as

[tex]F_n = mg cos \theta[/tex]

=> [tex]225 = (25 * 9.8) cos \theta[/tex]

=> [tex] 0.9183 = cos \theta[/tex]

=> [tex]\theta = cos^{-1}[0.9183][/tex]

=> [tex]\theta = 23.32^o [/tex]

Generally for the bag not to slip , it means that the frictional force is equal to the sliding force

[tex]F_f = F_s[/tex]

Hence [tex]F_f [/tex] is mathematically represented as

[tex]F_f = \mu_s * F_n [/tex]

While [tex]F_s [/tex] is mathematically represented as

[tex]F_s = m * a [/tex]

So

[tex] \mu_s * F_n = m * a [/tex]

=> [tex] \mu_s * 225 = 25 * 2.40 [/tex]

=> [tex] \mu_s = 0.27 [/tex]

Generally from the workdone equation we have that

[tex]KE_f - KE_i = W_f[/tex]

Here [tex]W_f[/tex] is the work done by friction which is mathematically represented as

[tex]W_f = m * g * \mu_k * s[/tex]

Here s is the distance covered by the bag

[tex]KE_f[/tex] is zero given that velocity at rest is zero

and

[tex]KE_i = \frac{1}{2} * m* v_i^2[/tex]

so

   [tex] \frac{1}{2}  *  m* v_i^2 = m * g * \mu_k * s [/tex]

=>  [tex] \frac{1}{2}  *  v_i^2 =   g * \mu_k * s [/tex]

substituting  2.55 m/s for v_i and 0.350 for  \mu_k  we have that

     [tex] \frac{1}{2}  *  2.55^2 =   9.8 * 0.350 * s [/tex]

=> [tex] s = 0.948 \ m [/tex]

Answer:

Explanation:

r=A(1 m/s)t^i+A((1 m/s3)t3−6(1 m/s2)t2)^j,

dr / dt = A i  + (3 A t² - 6 x 2 t ) j

At t = 2

dr / dt = A i  + (12A - 24 A ) j  = A i - 12 A j .

Since slope is negative so velocity is downwards , hence it is descending

b ) velocity = dr / dr =  .  A i  + (3 A t² - 6 x 2 t ) j

Vx = A

Vy = 3A t² - 12 t

Answer:

Molecules in container 2 has a higher pressure.

Molecules in container 2 has a greater rms speed.

Molecules in container 2 has a greater kinetic energy.

Molecules in container 2 has a greater thermal energy.

Explanation:

At constant volume and temperature, The number of moles of a gas is proportional to its pressure.

The lower the pressure, the lesser the rms speed of molecules, kinetic energy of the molecules and thermal energy of the molecules, hence the answer above.

Good energy, Bad energy, Energy used to run, Energy drinks,

Answer: 6 m/s squared

Explanation:

6m/s squared. Hope this helped

Plz give brainliest

Answer: Plot each graph on the same coordinate system.

35  ( m/ s)

50 m

a v t.

Answer:

I think the car is accelerating at 85 m/s because the car is moving at 35/m plus when it was coasting it went 50.

Explanation:

Sorry I dont have a graph but here is what I think about on the acceleration.

Answer:

The Heat  is  [tex]Q = 7736.7 \ KJ[/tex]

Explanation:

Generally from the question we are told that

  The volume of the water is  [tex]V = 25 L = \frac{25}{1000} = 0.025 \ m^3[/tex]

   The initial temperature is [tex]T_i = 16^oC = 16 + 273 = 289 \ K[/tex]

    The final temperature is [tex]T_f = 90^o C = 90 + 273 = 363 \ K[/tex]

Generally the heat required is mathematically represented as

    [tex]Q = m * c_w * (T_f - T_i)[/tex]

Here [tex]c_w[/tex]  is the specific heat capacity of  water with value  [tex]c_w = 4182 J/(K kg)[/tex]

        m  is the mass of the water which is mathematically represented as

         [tex]m = \rho * V[/tex]

Here [tex]\rho[/tex] is the density of the water which has a value  [tex]\rho = 1000 kg/m^3[/tex]

So

      [tex]m = 0.025 * 1000 = 25 kg[/tex]

So

     [tex]Q = 25 * 4182 * (363 - 289)[/tex]

=>   [tex]Q = 7736700 \ J[/tex]

Converting to KJ

      [tex]Q = \frac{ 7736700}{1000}[/tex]

=>    [tex]Q = 7736.7 \ KJ[/tex]

Answer: True

Explanation: When people pollute  it breaks down the earth, that is why icebergs are melting and animals are going extinct. Before we know it, people are gonna start losing hearing, and there brain will shut down. That is also why people should stop polluting.

Let car A's starting position be the origin, so that its position at time t is

A: x = (40 m/s) t

and car B has position at time t of

B: x = 100 m - (60 m/s) t

They meet when their positions are equal:

(40 m/s) t = 100 m - (60 m/s) t

(100 m/s) t = 100 m

t = (100 m) / (100 m/s) = 1 s

so the cars meet 1 second after they start moving.

They are 100 m apart when the difference in their positions is equal to 100 m:

(40 m/s) t - (100 m - (60 m/s) t) = 100 m

(subtract car B's position from car A's position because we take car A's direction to be positive)

(100 m/s) t = 200 m

t = (200 m) / (100 m/s) = 2 s

so the cars are 100 m apart after 2 seconds.

Answer:

Effort force[tex]=824.04 \sin\theta[/tex]

where [tex]\theta[/tex] is the angle of inclination of the ramp.

Explanation:

The given combined mass of a person and wheelchair is 185 lb.

In SI unit, 1 pound= 0.453592 kg

So, 185 lb=[tex]185\times0.453592[/tex] kg=84kg (approximately)

Assuming the whole mass as a point mass and denote it by M, so

M=84kg

Let the angle of inclination of the ram with the is [tex]\theta[/tex] with respect to the ground and assume that the friction offered by ram id negligible, so neglection the frictional force.

The applied effort force, F, will be minimum when applied in the direction parallel to the ramp surface as shown in the figure.

The gravitational force action on M is Mg in the downward direction.

For the mass M to be at an equilibrium condition on the ramp, the sum of the total force in any direction will be zero.

Equate the sum of all the forces in the direction parallel to the ramp to zero.

[tex]F-Mg\sin\theta=0[/tex]

[tex]\Rightarrow F=Mg \sin\theta[/tex]

[tex]\Rightarrow F=84\times 9.81\sin\theta[/tex]

[tex]\Rightarrow F=824.04\sin\theta N[/tex].

Explanation:

a. mm

b. μm

c. cm

d. km

e. m

f. nm

Answer:

physical law (plural physical laws) A universal statement about the operation of nature, based on empirical observations of physical behavior, tested using scientific method.

Explanation:

Answer:

216m

Explanation:

As we know S=ut+1/2at^2

S=6×12+1/2×2×12×12

=72+144

=216 m

Answer:

[tex]v=0.25 \frac{m}{s}[/tex]

Explanation:

Hello,

In this case, since the average velocity is computed as the change in the distance divided by the elapsed time:

[tex]v=\frac{\Delta x}{\Delta t}[/tex]

As 4 m were displaced in 16 seconds, the average speed turns out:

[tex]v=\frac{4m}{16s} \\\\v=0.25 \frac{m}{s}[/tex]

Best regards.

Answer:

I think that bicycle B is C 6km/min

hope this helps <3

Answer:

I believe it is true

If not, pls let me know. :)

Answer:

A. Nuclear and fossil fuel-burning power plants differ mainly in where their energy comes from; a nuclear reactor produces heat from radioactive metals, and a fossil-fuel plant burns coal, oil or natural gas.

B. Environmental and economic benefits of using renewable energy include: Generating energy that produces no greenhouse gas emissions from fossil fuels and reduces some types of air pollution. Diversifying energy supply and reducing dependence on imported fuels

C. These are energy sources that are constantly being replenished, such as sunlight, wind, and water.

The most popular renewable energy sources currently are:

Solar energy.

Wind energy.

Hydro energy.

Tidal energy.

Geothermal energy.

Biomass energy.

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The acceleration due to gravity only points downward with magnitude g. The angle of the projectile doesn't matter.

Answer:

The number of electrons per second received by the panel is 2.19 x 10²¹ electrons/second

Explanation:

Given;

intensity of light, I = 225 W/m²

area of the solar panel, A = 2m x 6m = 12m²

Power of photons hitting the panel = 225 W/m² x 12m² = 2700 W

Power received by the electrons in the panel = 0.13 x 2700 W = 351 W

Energy of these electrons = 351 J/s

The number of electrons per second is given by;

[tex]= \frac{1 \ electron}{1.602*10^{-19} \ J} *\frac{351 \ J}{s} = 2.19*10^{21} \ electrons/second[/tex]

Therefore, the number of electrons per second received by the panel is 2.19 x 10²¹ electrons/second