What's the formula to find out power

Answers

Answer 1

Answer:
In general,

   Power = (energy moved) / (time to move the energy) .

If it's mechanical power, then

   Power = (work done) / (time to do the work) .

If it's electrical power, then it can be any one of these:

   Power = (volts) x (amperes)

   Power = (volts)² / (resistance, ohms)

   Power = (amperes)² x (resistance, ohms) .

Whatever kind of energy you're dealing with, power always
turns out to be

(amount of energy produced, used, or moved)
divided by
(time taken to produce, use, or move the energy) .

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I need help i'm confused

What can be known about the density of sodiumhydroxide?
A. It will be 2.54 g/cm².
B. It will be different from the other chemicals.
C. It will be 1.67 g/cm3.
D. It will be the same as the other reactant.

Answers

d? maybe i’m trying to. see if it’s d or b

It’s D. It will be the same as the other reactant

At a temperature of 280k, the gas in a cylinder has a volume of 20.0 liters.If the volume of the gas is decreased to 10.0 liters, what must the temperature be for the gas to remain at a constant pressure?

Answers

Answer:

T = 140 K

Explanation:

As we know by ideal gas law

$PV = nRT$

now if pressure of the gas is constant

then we will have

$V = (nR)/(P) T$

now we have

$V_1 = 20.0 litre$

$T_1 = 280 K$

$V_2 = 10.0 litre$

now from above equation

$(20.0)/(10.0) = (280)/(T)$

$T = 140 K$

Temperature should be 140k to maintain constant pressure

A thin conducting plate 50.0 cm on a side lies in the xy plane. If a total charge of 4.00 ? 10 ?8 C is placed on the plate, find (a) the charge density on the plate, (b) the electric field just above the plate, and (c) the electric field just below the plate.

Answers

Answer:

a) 8*10^-8C/m²

b) +9.04*10^3N/C

c) = -9.04*10^3N/C

Explanation:

Given

Side length, L = 50cm = 0.5m

Charge on the plate, Q = 4*10^-8C

Surface charge density, σ = Q/A

The surface charge density of each part is then half of the total charge density of the plate. Thus,

σ(face) = 1/2σ

σ(face) = Q/2A

σ(face) = Q/2L²

Now we plug in, since we have Q and L

σ(face) = 4*10^-8 / 2*0.5²

σ(face) = 4*10^-8 / 0.5

σ(face) = 8*10^-8C/m²

Magnitude of electric field above the plate is,

E = σ(face) / E•

E = 8*10^-8 / 8.85*10^-12

E = 9.04*10^3 N/C

If we assume this plate lies on the side of the "xy" plane, the electric field is directed in the positive "z" direction. As such,

E = +9.04*10^3N/C

Electric field below the plate has the same magnitude, but different direction. So, E = -9.04*10^3N/C

Which characteristic does an object with a constant acceleration always have?A. changing velocity
B. constant velocity
C. fast speed
D. slow speed

Answers

By definition, speed is the integral of acceleration with respect to time.

We have then:

$v = \int\limits^t_0 {a} \, dt$

As the acceleration is constant, then integrating we have:

$v = a*t + vo$

Where,

vo: constant of integration that corresponds to the initial velocity

We observe then that the speed varies linearly when the acceleration is constant .

Therefore, for constant acceleration, the velocity is changing.

Answer:

an object with a constant acceleration always have:

A. changing velocity

The characteristic that an object with constant acceleration will always have is Changing velocity

Answer. . .
A. Changing Velocity corresponds with acceleration.

Good luck on your studies, hope this helps~ ^//^

Calculate the wavelength of a radio wave whose frequency is 900 kHz. (v = 3.00 · 108 m/s.)

Answers

The wavelength of a radio wave whose frequency is 900 kHz will be 10³/3, or you can write it as 333.33 meters.

What is Wavelength?

To characterize waveform signals that are transmitted across wires or into space, the term "wavelength" is used to refer to the separation between two identical positions (adjacent crests) in succeeding cycles. Typically, this length in wireless systems is measured in meters (m), centimeters (cm), or millimeters (mm) (mm). When describing the wavelength of infrared (IR), visible light (UV), and gamma radiation, units of 10⁻⁹ nanometers (nm) or angstroms (10-10 m) are more usually used.

Frequency, which is defined as the number of wave cycles per second, and wavelength have an inverse relationship. The wavelength of a signal decreases with increasing frequency, or we can say that wavelength and refractive index are inversely proportional to each other.

According to the question, the given values are :

v = 3 × 10⁸ m/s and,

frequency, f = 900 kHz or,

f = 900 × 10³ Hz

λ = v / f

λ = (3 × 10⁸) / (3 × 10³)

λ = 10³/3 metes or,

λ = 333.33 meters.

So, the wavelength of a radio wave is 333.33 meters.

To get more information about wavelength :

brainly.com/question/13533093

#SPJ2

Just use the Fundamental Equation of Periodic Waves:

$v=\lambda f \n \lambda= (3* 10^8)/(900* 10^3) \n \lambda = \boxed {(10^3)/(3)~m}$

A soccer ball is traveling at a velocity of 50 m/s. The kinetic energy of the ball is 500 J. What is the mass of the soccer ball?

Answers

A soccer ball is traveling at a velocity of 50 m/s. The kinetic energy of the ball is 500 J.The mass of the soccer ball is 0.4 kgs. This answer is derived from the formula K=1/2 MV^2.So velocity and kinetic energy are given from that mass of the ball is calculated.By substituting the values 500=1/2*M*50*50 which gives M=0.4 Kgs.

Answer:

C.0.4 kg

This is your answer!

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