4. A girl is sitting on a tire swing that is attached with a rope that is 2.1 m in length. Her dad pushes her with a speed of 3.0 m/s. If the centripetal force is 88 N, what is the mass of the girl? ​

Answer:

B

Explanation:

if a positively charged rod is brought near the knob of a neutral electroscope, it will attract some electrons up from the leaves onto the knob. That process causes both of the leaves to be positively charged (excess protons), and the leaves will diverge.

Answer:

Fundamental frequency

Answer:

The weight of the water above a diver exerts pressure on their body. The deeper a diver descends, the more water they have above them, and the more pressure it exerts on their body

Answer:

y = 33.93 10⁵ m

Explanation:

This is an interference exercise, for the contributory interference is described by the expression

           d sin θ = m λ

let's use trigonometry for the angle

           tan θ = y / L

how the angles are small

          tan θ = sin θ / cos tea = sin θ

we substitute

         sin θ = y / L

        d y / L = m λ

         y = m λ L / d

the light fulfills the relation of the waves

       c = λ f

       λ = c / f

       λ = 3 10⁸ /375

       λ = 8 10⁵ m

first order m = 1

let's calculate

        y = 1  8 10⁵  4030 10-9 / 950 10-9

        y = 33.93 10⁵ m

Answer:

v = 3.65 m / s

Explanation:

In this exercise we use the conservation of mechanical energy

starting point. Point A compressed spring

          Em₀ = 100 J

final point. Point B uncompressed spring

         Em_f = K = ½ m v²

energy is conserved

         Em₀ = Em₀_f

         100 = ½ m v²

         v = [tex]\sqrt{ \frac{2 \ 100 }{m} }[/tex]

         v = [tex]\sqrt {200/15}[/tex]

         v = 3.65 m / s

Answer:

t = 1.22 s

Explanation:

Given that,

The initial upward velocity component of a football = 12 m/s

The horizontal velocity component is 20 m/s

We need to find the time required for the football to reach the highest point of the trajectory. Let the time is t.

Using first equation of motion to solve it such that,

[tex]v=u+at[/tex]

u is initial velocity

v is final velocity

a = -g

so,

[tex]t=\dfrac{u}{g}\\\\t=\dfrac{12}{9.8}\\\\t=1.22\ s[/tex]

So, the required time taken by the football to reach the highest point is 1.22 seconds.

Answer:

frequency=1/time period

99HZ*time period=1

time period=1/99HZ

=0.01 second

Explanation:

Answer:

7. (D) uniformly accelerated vertical motion

8. (A) zero

9. (A) zero

10. (C) parabolic

Answer:

7.Uniformly accelerated vertical motion

8.0m/s²

9.9.8m/s

10.parabolic

11.vertical component.

Answer:

a. V = 100 voltios

b. Para 120 V → [tex]R_{2} = 4 \Omega[/tex]

c. Para 110 V → [tex]R_{2} = 2 \Omega[/tex]

Explanation:

a. La tensión se puede calcular mediante la ley de Ohm:

[tex] V = IR [/tex]

V: es el voltaje o tensión =?

I: es la corriente = 5 A

R: es la resistencia = 20 Ω

Entonces, la tensión es:

[tex]V = IR = 5 A*20 \Omega = 100 V[/tex]

b. La resistencia adicional es la siguiente:

[tex] R_{2} + R_{1} = \frac{V}{I} [/tex]

[tex]R_{2} = \frac{V}{I} - R_{1} = \frac{120 V}{5 A} - 20 \Omega = 4 \Omega[/tex]

c. La resistencia adicional para operar a 110 voltios es:

[tex]R_{2} = \frac{V}{I} - R_{1} = \frac{110 V}{5 A} - 20 \Omega = 2 \Omega[/tex]

Espero que te sea de utilidad!

The Formula Bar is where data or formulas you enter into a worksheet appear for the active cell. The Formula Bar can also be used to edit data or formula in the active cell. The active cell displays the results of its formula while we see the formula itself in the Formula Bar.

mark me brainliestt :))

Answer:

We dont know. It can look like anything

Explanation:

Although it's thought to be highly probable, we have no reliable evidence that aliens exist.

[tex]\huge{ \mathcal{  \underline{ Answer }: }}[/tex]

[tex] \boxed{ \mathrm{Work done = Force × displacement}}[/tex]

Therefore the distance covered :

[tex] \large \boxed{50 \: m}[/tex]

_____________________________

[tex]\mathrm{ ☠ \: TeeNForeveR \:☠ }[/tex]

Answer:

20kgm/s

Explanation:

p=mv

p=5*4

p=20kgm/s

Answer:

Increases

Explanation:

In the Compton scattering experiment with x-rays,

The change in operation

[tex]\Delta \lambda = \frac{h}{m_oc} [1-cos\theta][/tex]

Now rest being constant, as \theta increases, cos\theta decreases

Hence, The change in wavelength will increase with the increase in \theta.

Hence, wavelength increases with an increase in the angle of scatttering.

Answer: The waves are compressed as the item moves closer to you, so their wavelength is shorter.

Explanation:

Answer:

325.76 revolutions

Explanation:

The tire radius is diameter/2: 42/2 = 21

And now we can discover the lenght of the tire circumference. The lenght of a circumference is given by 2×radius×π, and let's consider π=3.14, and let's use the radius in meter (21 cm = 0.21 m):

2•0.21•3.14 = 1.32 m of lenght

Now, you divide the distance the car moved by the lenght of the tire circumference and you will find how many revolutions the tire makes:

420/1.32 = 325.76

Answer: 4.5 billion years

Explanation:

Some of the water molecules in your drinking glass were created more than 4.5 billion years ago, according to new research.

That makes them older than the Earth, older than the solar system — even older than the sun itself.

Answer: [tex]\alpha=4.798\ rad/s^2\quad [\text{deceleration}][/tex]

Explanation:

Given

Initial revolution of flywheel [tex]N_1=600\ rpm[/tex]

(Initial angular velocity [tex]\omega_i=\dfrac{2\pi N_1}{60}[/tex])

Final revolution of flywheel [tex]N_2=600\ rpm[/tex]

(Final angular velocity [tex]\omega_f=\dfrac{2\pi N_1}{60}[/tex])

Revolution turned [tex]34[/tex]

So, angle turned is [tex]\theta =2\pi \times 34\\[/tex]

Using equation of angular motion i.e. [tex]\omega_f^2-\omega_i^2=2\cdot \alpha \cdot \theta[/tex]

[tex]\Rightarrow \left(\dfrac{2\pi \times 416}{60}\right)^2-\left(\dfrac{2\pi \times 416}{60}\right)^2=2\alpha \times (68\pi )\\\\\Rightarrow \alpha=\dfrac{1898.344-3948.86}{427.312}\\\\\Rightarrow \alpha =-4.798\ rad/s^2\\\Rightarrow \alpha =4.798\ rad/s^2\quad [\text{deceleration}][/tex]

Answer:

Basically, the main risk is cardiac arrest, caused by the electric current interfering with the normal operation of the heart muscle. Other possible damages are burns due to the electric energy vaporizing the water inside the cells, and nerve damage caused by excessive current through the nerves.

The main hazards of working with electricity are:

Explanation:

Answer:

The blue one.

Explanation:

Im pretty sure its because the blue is hotter.

Answer:

115.3395 j

Explanation:

K= 1/2mv²= (7.1/2)*5.7² = 115.3395 j

Answer:

115.34 J

General Formulas and Concepts:

Energy

Kinetic Energy Formula: [tex]\displaystyle KE = \frac{1}{2}mv^2[/tex]

Explanation:

Step 1: Define

Identify variables

[Given] m = 7.1 kg

[Given] v = 5.7 m/s

[Solve] KE

Step 2: Solve for KE

Topic: AP Physics 1 - Algebra Based

Unit: Energy

Book: College Physics

Answer:

This unbalanced force causes her to change in direction.

If the forces on an object are unbalanced, this is what happens:

a stationary object starts to move in the direction of the resultant force

a moving object changes speed and/or direction in the direction of the resultant force

[tex]\boxed{\large{\bold{\textbf{\textsf{{\color{blue}{Answer}}}}}}:)}[/tex]

A skier is at the top of the mountain facing east. The skier then decides to skis to the westward side of the mountains and pushes off .The unbalanced for causes her to change in Direction.

Answer:

a)   a = - 0.0833 m / s²,  b)   t = 4.4 s

Explanation:

a) this is a kinematics exercise where the acceleration is along the inclined plane

         v = v₀ - a t

         a = v₀ - v / t

         a = 3 - 8/60

         a = - 0.0833 m / s²

b) in this case the final velocity is zero

         v = v₀ - a t

         0 = v₀ - at

         t = v₀ / a

         t = 28 / 6.4

         t = 4.375 s

         t = 4.4 s

Answer:

0.39 seconds

Explanation:

Given:

Distance, S = 0.75 m

Acceleration due to gravity, g = 9.81 m/s^2

Initial (vertical) velocity, u = 0 m/s

Final velocity,

S = ut + (1/2)gt^2

0.75 = 0(t) + (1/2)(9.81)t^2

t^2 = 0.75/(9.81/2) = 0.1529 s^2

t = sqrt(0.1529) s.

= 0.391 s.

The time it takes an object to fall a certain distance is 0.39 s. Therefore, option (B) is correct.

To determine how long it takes for the glass of iced tea to hit the ground, we can use the kinematic equation that relates the distance, time, initial velocity, and acceleration of an object under free fall.

Assuming the glass is dropped from rest, its initial velocity is zero, and the acceleration due to gravity is[tex]-9.8 m/s^2[/tex] (negative because it is acting in the opposite direction to the motion).

Using the equation:

[tex]d = 1/2 * a * t^2[/tex]

where d is the distance, a is the acceleration due to gravity, and t is the time, we can solve for t:

[tex]0.75 m = 1/2 * (-9.8 m/s^2) * t^2[/tex]

Simplifying this equation gives:

[tex]t^2 = 0.75 m / (1/2 * 9.8 m/s^2) = 0.153[/tex]

Taking the square root of both sides gives:

[tex]t = sqrt(0.153) = 0.39 s[/tex]

Therefore, the correct option is B. It takes approximately 0.39 seconds for the glass of iced tea to hit the ground.

Learn more about acceleration, here:

https://brainly.com/question/12550364

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Answer:

bioremediation :)

Explanation: