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Ksju [112]
3 years ago
5

Heat moves from a cup of hot tea into the hands of the person holding it because of heat transfer by

Physics
1 answer:
Serjik [45]3 years ago
5 0
Conduction because glass is a material that conducts heat.
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A cube with sides of area 48 cm^2 contains a 28.7 nanoCoulomb charge. Find the flux of the electric field through the surface o
Anuta_ua [19.1K]

Answer:

The flux of the electric field through the surface is 3.24\times10^{3}\ Nm^/C[/tex].

Explanation:

Given that,

Area of cube = 48 cm²

Charge = 28.7 nC

We need to calculate the flux of the electric field through the surface

Using formula Gauss's law

The electric flux through any closed surface,

\phi =\dfrac{q}{\epsilon_{0}}

Where, q = charge

Put the value into the formula

\phi=\dfrac{28.7\times10^{-9}}{8.85\times10^{-12}}

\phi =3.24\times10^{3}\ Nm^/C

Hence, The flux of the electric field through the surface is 3.24\times10^{3}\ Nm^/C[/tex].

5 0
3 years ago
An explosive projectile is launched straight upward to a maximum height h. At its peak, it explodes, scattering particles in all
Varvara68 [4.7K]

Answer:

θ = tan⁻¹ (\frac{19.6 \ h}{v})

Explanation:

This problem must be solved using projectile launch ratios. Let's analyze the situation, the projectile explodes at the highest point, therefore we fear the height (i = h), the speed at this point is the same, but the direction changes, we are asked to find the smallest angle of the speed in the point of arrival with respect to the x-axis.

The speed at the arrival point (y = 0)

           v² = vₓ² + v_y²

Let's see how this angle changes, for two extreme values:

* The particle that falls from the point of explosion, in this case the speed is vertical

         v = v_y

the angle with the horizontal is 90º

* The particle leaves horizontally from the point of the explosion, the initial velocity is horizontal

         vₓ = v

the final velocity for y = 0

         v_f = vₓ² + v_y²

therefore the angle has a value greater than zero and less than 90º

As they ask for the smallest angle, we can see that we must solve the last case

the output velocity is horizontal vₓ = v

Let's find the velocity when it hits the ground y = 0, with y₀ = h

            v_{y}^2 = v_{oy}^2 - 2 g (y-y₀)

            v_{y}^2 = - 2g (0- y₀)

let's calculate

           v_{y}^2 = 2 9.8 h

         

we use trigonometry to find the angle

        tan θ = \frac{v_y}{v_x}

        θ = tan⁻¹ (\frac{v_y}{v_x})

let's calculate

         θ = tan⁻¹ (\frac{19.6 \ h}{v})

3 0
3 years ago
You push against a steamer trunk with a force of 800 n at an angle alpha with the horizontal . the trunk is on a flat floor and
galina1969 [7]
The formula for this problem that we will be using is:
F * cos α = m * g * μs where:F = 800m = 87g = 9.8
cos α = m*g*μs/F= 87*9.8*0.55/800= 0.59 So solving the alpha, find the arccos above.
α = arccos 0.59 = 54 ° is the largest value of alpha
6 0
3 years ago
When the sound from two sound waves goes up and down (loud, soft, loud, soft) it makes a distinctive sound pattern called beats.
djverab [1.8K]

The beats are actually two new sounds.

Their frequencies are (the sum of the original two frequencies) and (the difference of the original two frequencies).

The existence of the beats is the result of the difference in the frequencies of the original two sounds. <em> (b)</em>

8 0
3 years ago
Read 2 more answers
When using a micron gauge, if the pressure gauge falls frim 1,300 to 1,000 instantly, the vehicle needs to?
julsineya [31]
If the micron gauge pressure falls instantly, it means that the moisture of the air-conditioning is frozen, therefore you need to move the vehicle to a warmer place in order to unfreeze the moisture.
5 0
3 years ago
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