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3 years ago

2. A marble is rolling at a velocity of 1.5 m/s with a momentum of 3.0 kg×m/s. What is its mass?

Physics

1 answer:

Nikolay [14]3 years ago

5 0

Answer:

m= 2[kg]

Explanation:

Linear momentum can be calculated as the product of mass by Velocity.

$P=m*v$

where:

P = linear momentum = 3 [kg*m/s]

v = velocity = 1.5 [m/s]

m = mass [kg]

$m=P/v\\m=3/1.5\\m=2[kg]$

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Scientists have detected sound waves with frequencies as low as 13 Hz being produced by

Lena [83]

Answer:

The wavelength of the sound waves are, λ = 26.92 m

Explanation:

Given data,

The frequency of the sound waves, f = 13 Hz

The speed of sound waves in air, v = 350 m/s

The velocity of the wave in the medium is equal to the product of its wavelength and its frequency.

The formula for the wavelength of the waves is,

λ = v / f

Substituting the given values in the above equations,

λ = 350 m/s / 13 Hz

= 26.92 m

Hence, the wavelength of the sound waves are, λ = 26.92 m

4 0

4 years ago

The Sun delivers an average power of 1150 W/m2 to the top of the Earth’s atmosphere. The permeability of free space is 4π × 10−7

My name is Ann [436]

Answer:

E=930.84 N/C

Explanation:

Given that

I = 1150 W/m²

μ = 4Π x 10⁻⁷

C = 2.999 x 10⁸ m/s

E= C B

C=speed of light

B=Magnetic filed ,E=Electric filed

Power P = I A

A=Area=4πr² ,I=Intensity

$I=\dfrac{CB^2}{2\mu_0}$

$I=\dfrac{CE^2}{2\mu_0 C^2}$

$E=\sqrt{{2I\mu_0 C}}$

$E=\sqrt{{2\times 1150\times 4\pi \times 10^{-7}(2.99792\times 10^8)}}$

E=930.84 N/C

Therefore answer is 930.84 N/C

4 0

4 years ago

You have 2 resistors of unknown values you label Ra and Rb. You have an old battery and a multimeter you bought years ago for 7$

Veseljchak [2.6K]

Answer:

the answers, the correct one is D, Rb₂ = 29.97 ohm

Explanation:

For this exercise we use ohm's law and the equivalent resistance ratio for series and parallel circuits.

Serial circuit

(Ra + Rb) is = V

(Ra + Rb) 0.111 = 10

(Ra + Rb) = 10 / 0.111 = 90.09

parallel circuit

$\frac{1}{R} = \frac{1}{Ra} + \frac{1}{Rb}$

R = $\frac{Ra \ Rb}{Ra + Rb}$

\frac{Ra \ Rb}{Ra + Rb} i_p = V

\frac{Ra \ Rb}{Ra + Rb} 0.5 = 10

\frac{Ra \ Rb}{Ra + Rb} = 10 / 0.5 = 20

we write and solve our system of equations

Ra + Rb = 90.09

\frac{Ra \ Rb}{Ra + Rb} = 20

we solve for Ra in the first equation

Ra = 90.09 - Rb

RaRb = 20 (Ra + Rb)

we substitute Ra in the second equation

(90.09-Rb) Rb = 20 [(90.09-Rb) + Rb]

90.09 Rb - Rb² = 20 90.09

Rb² - 90.09 Rb + 1801.8 = 0

we solve the quadratic equation

Rb = [90.09 ± $\sqrt{90.09^2 - 4 \ 1801.8}$ ] / 2

Rb = [90.09 ± 30.15] / 2

Rb₁ = 60.12 ohm

Rb₂ = 29.97 ohm

the smallest value is Rb = 30 ohm

When checking the answers, the correct one is D

6 0

3 years ago

What are 2 active volcanic hotspots with a brief description in your own word NOT GOOGLE'S.

tankabanditka [31]

Explanation:

In geology, the places known as hotspots or hot spots are volcanic regions thought to be fed by underlying mantle that is anomalously hot compared with the surrounding mantle. Examples include the Hawaii, Iceland and Yellowstone hotspots.

4 0

3 years ago

A cube of copper was found to have a mass of 630 g. What are the dimensions of the cube? (The density of copper is 8.94 g/cm3.)

raketka [301]

Answer:

Density = mass/volume

Volume of cube = mass/density

630g/8.94 = 70.5cm^3 (3s.f.)

Since it is a cube, its dimensions of Length x breadth x height=volume

Take 70.5 amd cube root it

$\sqrt[3]{70.4697986577)$

=4.13 (3s.f)

hence , it would be 4.13 x 4.13 x 4.13 to find the volume

Hence, the answer would be 4.13cm(3s.f.)

3 0

3 years ago