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3 years ago

If a small motor does 520 J of work to move a toy car 260 m in 3.0 seconds, how much power is being applied by the motor?

Physics

1 answer:

Lubov Fominskaja [6]3 years ago

4 0

Answer:

P = 173.33 [W]

Explanation:

Power is defined as the amount of work done over a given time.

W = work = 520 [J]

t = time = 3 [s]

P = power [w]

Therefore by working relationship over time we can calculate the power.

$P =W/t\\P = 520/3\\P=173.33[W]$

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Which branches of natural science include the study of an organism that lived 10 million years ago?

Verdich [7]

Analyzing the components and decay products of school lunches.

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3 years ago

Read 2 more answers

The work function of a metal surface is 4.80 × 10-19 J. The maximum speed of the electrons emitted from the surface is vA = 7.7

poizon [28]

Answer:

$\lambda_A=2.65177\times 10^{-7}\ m$

$\lambda_B=3.32344\times 10^{-7}\ m$

Explanation:

h = Planck's constant = $6.63\times 10^{-34}\ m^2kg/s$

c = Speed of light = $3\times 10^8\ m/s$

m = Mass of electron = $9.11\times 10^{-31}\ kg$

$W_0$ = Work function = $4.8\times 10^{-19}\ J$

$v_A$ = Velocity of A particle = $7.7\times 10^5\ m/s$

$v_B$ = Velocity of B particle = $5.1\times 10^5\ m/s$

The wavelength is given by

$\lambda=\frac{hc}{\frac{1}{2}mv^2+W_0}$

$\lambda_A=\frac{6.63\times 10^{-34}\times 3\times 10^8}{\frac{1}{2}9.11\times 10^{-31}(7.7\times 10^5)^2+4.8\times 10^{-19}}\\\Rightarrow \lambda_A=2.65177\times 10^{-7}\ m$

The wavelength $\lambda_A=2.65177\times 10^{-7}\ m$

$\lambda_B=\frac{6.63\times 10^{-34}\times 3\times 10^8}{\frac{1}{2}9.11\times 10^{-31}(5.1\times 10^5)^2+4.8\times 10^{-19}}\\\Rightarrow \lambda_B=3.32344\times 10^{-7}\ m$

The wavelength $\lambda_B=3.32344\times 10^{-7}\ m$

5 0

4 years ago

A group of scientists studied seismic waves and observed that the speed of seismic waves changes as they travel deeper into the

Misha Larkins [42]

Answer:

Hey there.

Your answer (this is my guess) should be layers. I think this because the change in density of the layers from the inner core of the earth to its crust affects the speed of seismic waves.

So if the speed of seismic waves changed you can most likely deduce that the earth has layers.

If i am correct i would really like a brainly.

7 0

3 years ago

Calculate the heat energy required to increase the temperature of 3 kg of water by 20ºC. The specific heat capacity of water is

Marina86 [1]

Answer:

Heat energy required = 252000J or 252KJ.

Explanation:

<u>Given the following data;</u>

Mass = 3kg

Temperature = 20ºC

Specific heat capacity of water = 4200 J/kg°C

To find the heat energy required;

Heat capacity is given by the formula;

$Q = mct$

Where;

Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
t represents the temperature.

Substituting into the equation, we have;

$Q = 3*4200*20$

Q = 252000 Joules or 252 Kilojoules.

6 0

3 years ago

Cara menghitung daya dorong

Arlecino [84]

Thrust adalah kekuatan atau dorongan. Ketika sistem mendorong atau mempercepat massa dalam satu arah, ada dorong (force) hanya besar dalam arah yang berlawanan. Dalam matematika dan fisika, ini dijelaskan oleh hukum kedua dan ketiga Isaac Newton. Dorong digunakan untuk menggambarkan seberapa baik jenis mesin berjalan. Hal ini dapat digunakan untuk berbagai jenis mesin seperti mesin roket, pesawat (baling-baling) mesin, dan mesin jet.
Thrust diukur dalam "pon dorong" di AS dan di Newton dalam sistem metrik. 4.45 Newton dorong sama dengan 1 pon dorong. Satu pon dorong adalah berapa banyak dorong yang dibutuhkan untuk menjaga satu pon objek tak bergerak melawan gaya gravitasi di bumi.

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4 years ago