Help me please please help me

Answer:

3g/cm³

Explanation:

2.7

The seven adds 1 to the 2 making it 3.0

Answer:

its A

Explanation:

Answer:

True

Explanation:

It is true that the real definition of lenz's law in magnetism is the current is induced in the closed conducting loop in such a direction that the magnetic field induced by this current opposes the change in the flux through the loop.

This means that induced current opposes the very cause that produces it.

Answer:

20 Volts

Explanation:

Ohm's Law and Power Equations

Ohm's law equation (formula): V = I × R and the power law equation

(formula): P = I × V. P = power, I or J = Latin: influare, international ampere, or intensity and R = resistance. V = voltage, electric potential difference Δ V or E = electromotive force (emf = voltage).

Voltage or volts E or V: volts V

Resistivity or resistance R: ohms Ω

Wattage or power P: watts W

Amperage or current I: amperes, amps A

Answer:

v = 0.99 c = 2.99 x 10⁸ m/s

Explanation:

From the special theory of relativity:

[tex]t = \frac{t_o}{\sqrt{1-\frac{v^2}{c^2} } }\\[/tex]

where,

v = speed  of travel = ?

c = speed of light = 3 x 10⁸ m/s

t = time measured on earth = 90 years

t₀ = time measured in moving frame = 6 months = 0.5 year

Therefore,

[tex]90\ yr = \frac{0.5\ yr}{\sqrt{1-\frac{v^2}{c^2} } } \\\\\\\sqrt{1-\frac{v^2}{c^2}} = \frac{0.5\ yr}{90\ yr}\\ 1-\frac{v^2}{c^2} = 0.00003086\\\frac{v^2}{c^2} = 1-0.00003086\\[/tex]

v = 0.99 c = 2.99 x 10⁸ m/s

Answer:

A.) 355 m/s

B.) 0.71 m

C.) 500Hz

Explanation:

Given that a police car is traveling due east at a speed of 15.0 m/s relative to the earth. You are in a convertible following behind the police car. Your car is also moving due east at 15.0 m/s relative to the earth, so the speed of the police car relative to you is zero. The siren of the police car is emitting sound of frequency 500 Hz. The speed of sound in the still air is 340 m/s

a.) What is the speed of the sound waves relative to you?

Since the car is moving away from the observer, the relative velocity will be:

Relative velocity = 340 + 15

Relative velocity = 355 m/s

b.) What is the wavelength of the sound waves at your location?

Using the wave speed formula

V = frequency × wavelength

Make wavelength the subject of formula.

Wavelength = Velocity / frequency

Wavelength = 355/500

Wavelength = 0.71 m

c.) What frequency do you detect?

Fo = Fs ( C + V ) / ( C + v )

Fo = Fs

That is, the frequency of the observer will be equal to the frequency of the source.

Therefore, Fo = 500Hz

Answer: The momentum principle depends on MASS and VELOCITY.

Explanation:

The momentum principle states that net force changes the the momentum of an object where momentum is the product of the MASS of the body and it's VELOCITY.

Thus, momentum = mass(kg) ×velocity( m/s)= kgm/s ( derived unit)

Also to determine the rate of change of momentum;

Mass=m, initial velocity =u, final velocity = V and time =t

Initial momentum = mu

Final momentum = mv

Change in momentum = mv - mu

= m( v- u)

Rate of change of momentum=

m( v -u)/t --> equation 1

But V = u + at

Hence, a = v -u/t

Substitute for v -u/ t in equation 1

F = Kma, where k is constant and has the value of 1.

Therefore F = ma

Newton is the SI unit if force. It is defined as the force which gives a mass of 1kg an acceleration of 1 m/s².

IMPULSE is defined as the change of momentum of a body (mv-mu) or the product of force and time.

Thus impulse = force × time = m (v-u)

The unit is Ns ( Newton seconds) which is the same as change in momentum.

Answer:

Centre of mass is the point at which the distribution of mass is equal in all directions, and does not depend on gravitational field. Centre of gravity is the point at which the distribution of weight is equal in all directions, and does depend on gravitational field.

Answer:

Centre of mass is the point at which the distribution of mass is equal in all directions, and does not depend on gravitational field.

Centre of gravity is the point at which the distribution of weight is equal in all directions, and does depend on gravitational field.

hope this helps you ☺️☺️

Answer:

how to deal with devoirce

Explanation:

The psychological and physical symptoms that Sarah presents include:

From the information given, we can infer that some of the symptoms include the fact that Sarah frequently has headaches, loss of appetite, and gets angry easily.

The primary psychological disorder diagnosis that fits her symptoms based on the disorders will be depression. She's depressed because she just got divorced. This has taken a toll on her health.

Read related link on:

https://brainly.com/question/19276767

Answer:

The conditions stop air from getting to the nail is the oil

Explanation:

Answer:

Gravity dams are so named because they are held to the ground by gravity – they weigh a lot, and are typically made from concrete or stone. Engineers must de-water the river where the dam is meant to be built. This is done by diverting the river through a tunnel that runs around the intended construction zone.

Answer:First, they dug tunnels from below the dam to above the dam. Then, they put the cofferdam in place, and opened the tunnels. The water flowed around the site where the permanent dam would be built until they were done, at which point the cofferdam was removed.

Explanation:hope this helped

Answer:

[tex]\omega '=-13.5rad/s[/tex]

Explanation:

From the question we are told that:

Time [tex]t=4sec[/tex]

Angular displacement [tex]\theta= 161 rad[/tex]

Final Angular velocity  [tex]\omega = 100 rad / s[/tex]

Let

Angular acceleration [tex]\alpha[/tex]  

Generally the equation for Initial Angular velocity  [tex]\omega '[/tex] is mathematically given by

[tex]-\omega '^2=2 \alpha \theta -\omega^2[/tex]

[tex]\omega '^2= \alpha 328 +11236[/tex]

Also,Initial Angular velocity  [tex]\omega '[/tex] is mathematically given by

[tex]\omega '=\omega - \alpha t[/tex]

Therefore substitution

[tex]-\omega '^2=2 \alpha \theta -\omega^2[/tex]

[tex]\omega '=\omega - \alpha t[/tex]

[tex](\omega - \alpha t)^2=2 \alpha \theta -\omega[/tex]

[tex]-16\alpha^2+848\alpha+11236= \alpha 328 -11236[/tex]

[tex]16\alpha^2-520\alpha=0[/tex]

[tex]\alpha=29.875rads/s^2[/tex]

Substitution in the 2nd equation for Initial Angular velocity  [tex]\omega '[/tex]

[tex]\omega '=106-(29.875rads/s^2*4)[/tex]

[tex]\omega '=-13.5rad/s[/tex]

Answer:

Torque = R X F = R * F sin theta

-f * 2R  will exert an equal opposite torque

-f * 2 = F sin theta

f = -F sin theta / 2

Answer:

C. Neutrons

Explanation:

Protons +

Electron -

Answer:

The solution is given below:

Explanation:

The computation of the speed is shown below

As we know that

Speed = distance ÷ time

where

distance is 2000 km

And, the time is 2.5 hours

SO, the speed is

= 2,000 ÷ 2.5

= 800 km/h

Now the distance would be the same i.e. 2,000 km

but the time is 2 hours

So, the speed is

= 2,000 km ÷ 2 hours

= 1,000 km/hr

The direction should be opposite to the first airplane

[tex]\huge{\mathbb{\tt { QUESTION↓}}}[/tex]

In the early solar system,comets that struck earth may have brought in

[tex]\color{green}{\tt{O} \: \: \color{black}{\tt {A.water}}}[/tex]

[tex]\color{green}{\tt{O} \: \: \color{black}{\tt {B.Advanced Life}}}[/tex]

[tex]\color{green}{\tt{O} \: \: \color{black}{\tt {C.Plankton}}}[/tex]

[tex]\color{green}{\tt{O} \: \: \color{black}{\tt {D. All \: of \: the \: above}}}[/tex]

[tex]\huge{\mathbb{\tt { ANSWER↓}}}[/tex]

[tex]\color{red}{\tt {D. \: All \: of \: the \: above}}[/tex]

[tex]\color{black}{\tt {because \: the \: true \: answer \: is \: comet}}[/tex]

[tex]{\boxed{\boxed{\tt{WHAT \: IS \: COMET?}}}}[/tex]

[tex]\color{black}{\tt{A \: comet \: is \: an \: icy, \: small \: Solar \: System \: body}}[/tex]

[tex]\color{black}{\tt { that, \: when \: passing \: clos \: e to}}[/tex]

[tex] \color{black}{\tt {the \: Sun, \: warms \: and \: begins \: to \: release}}[/tex]

[tex]\color{black}{\tt { gases, \: a \: process \: that \: is \: called \: outgassing. }}[/tex]

[tex]\color{black}{\tt{This \: produces \: a \: visible \: atmosphere \: or \: coma,}}[/tex]

[tex]\color{black}{\tt{and \: sometimes \: also \: a \: tail}}[/tex]

#CarryOnLearning

#LetsEnjoyTheSummer

Answer:

Energy and frequency

Explanation:

answer:

From the fan side: Salary caps mean better competition and more parity between all teams in a given league (in theory, anyway). Salary caps in the NFL, NBA and NHL can foster this, but in MLB, luxury tax requirements may not be enough to prevent large-market teams from dominating.

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Answer:

The structure of Germanium crystals will be destroyed at higher temperature. However, Silicon crystals are not easily damaged by excess heat. Peak Inverse Voltage ratings of Silicon diodes are greater than Germanium diodes. Si is less expensive due to the greater abundance of element.

Answer:haha

Explanation:dont know

Answer:

5 V

Explanation:

V = IR

V = .25A * 20 Ohms = 5 V

Answer:

Food supplies the body with energy and without energy the body cannot work.

Answer:

v = c / n      (n = 1 for air)

v = c / 1.33 = 3 * 10E8 m/s / 1.33 = 2.25 * 10E8 m/s

The diagram which represents the electric field around a negatively charged conducting sphere is: Image D.

An electric charge can be defined as a fundamental, physical property of matter, that typically governs how particles are affected by an electric field or electromagnetic field, especially due to the presence of an electrostatic force.

The electric field around a negatively charged conducting sphere are all attracted to the sphere in accordance with the law of electrostatic forces, as depicted by Image D in the given diagram.

Read more on charge here: brainly.com/question/4313738

Answer:

9) c

10) c

11) d

12) d

Explanation:

I think it's helps you

Answer:

The large piston would rise by [tex]10\; \rm cm[/tex] (which is equal to [tex]0.1\; \rm m[/tex].)

Explanation:

Convert the unit of the area of the larger piston to [tex]\rm cm^{2}[/tex]:

[tex]0.01\; \rm m^{2} = 100\; \rm cm^{2}[/tex].

If the pipe is cylindrical, the liquid that the smaller piston pushed into the pipe would be a cylinder:

Volume of liquid that the smaller piston pushed into the pipe:

[tex]\begin{aligned} & \text{Volume of Cylinder} \\ &= \text{Area of the Top of the Cylinder} \\ &\quad\quad \times \text{Height of Cylinder} \\ &= 20\; \rm cm^{2} \times 50\; \rm cm \\ &= 1000\; \rm cm^{3} \end{aligned}[/tex].

Unlike gas, the volume of a liquid (such as the one in this hydraulic press) at a given temperature tends to be fixed.

Therefore, when the small piston pushed [tex]1000\; \rm cm^{3}[/tex] of liquid into the pipe, liquid of the exact same volume ([tex]1000\; \rm cm^{3}\![/tex]) would appear under the larger piston and push the larger piston upwards.

Rearrange the equation to find the height by which the larger piston rises (same as the height of the [tex]1000\; \rm cm^{3}[/tex] liquid cylinder under the larger piston.)

[tex]\begin{aligned} & \text{Height of Cylinder} \\ &= \frac{\text{Volume of the Cylinder}}{\text{Area of the Top of the Cylinder}} \\ &= \frac{1000\; \rm cm^{3}}{100\; \rm cm^{2}} = 10\; \rm cm \end{aligned}[/tex].

Answer:

No

Explanation:

Recall that the hierarchy of wavelength color from minimum wavelength to maximum wavelength is:

[tex]V < I < B < G < Y < O < R;[/tex] and

[tex]E \ \alpha \ \dfrac{1}{\lambda}[/tex]

As a result, blue light has a higher energy level than green and red light.

As a result, the surface glows due to the blue LED. The green LED, on the other hand, would not allow the surface to glow as much as the red LED, which has a lower energy level when compared to the green light. As a result, the red LED would not allow the surface to glow as well.

Answer:

1.60 x 10^-18 J

Explanation:

we know that, Work done = Voltage x Charge,

hence we get as,

Energy = V x Q

E = 2 x (8.0 * 10^-19)

==> E = 16 x 10^-19

=> E = 16/10 x 10^-18

==> E = 1.60 x 10^-18 J