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3 years ago

Why do you often freeze after a shower? Help mee

1 answer:

5 0

When water evaporates of your body it cools you down, hence why after a shower when the water droplets begin to evaporate you feel cold

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From the photoelectric effect we learn that A. a blue photon has less energy than a red photon B. a blue photon has equal energy

emmainna [20.7K]

Answer: E. None of the above

Explanation: The energy of a photon is given by the formula below.

E=hf or E = hc/λ

E = energy, h = planck constant, c= speed of light and

λ= wavelength.

From E=hf we can see that energy is directly proportional to frequency since h is a constant, this implies that as we move up the visible light spectrum, red light has the least frequency this accounting for the lowest energy while violet has the largest energy accounting for a very high energy.

Blue light is higher in the spectrum than red light.

This implies that blue light has more energy than red.

Visible light is part of the electromagnetic spectrum which implies that they all travel with the same speed of a constant value ( speed of light = 3* 10^8 m/s).

Thus in conclusion, blue light has more energy that red light but they both travel with the same speed.

This point nullifies the options thus making none of it correct.

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4 years ago

g A spherical container of inner diameter 0.9 meters contains nuclear waste that generates heat at the rate of 872 W/m3. Estimat

zhannawk [14.2K]

Answer: The total rate of heat transfer from the container to its surroundings ignoring radiation is 332.67 W.

Explanation:

Given: Inner diameter = 0.9 m

q = 872 $W/m^{3}$

Now, radii is calculated as follows.

$r = \frac{diameter}{2}\\= \frac{0.9}{2}\\= 0.45 m$

Hence, the rate of heat transfer is as follows.

$Q = q \times V$

where,

V = volume of sphere = $\frac{4}{3} \pi r^{3}$

Substitute the values into above formula as follows.

$Q = q \times \frac{4}{3} \pi r^{3}\\= 872 W/m^{3} \times \frac{4}{3} \times 3.14 \times (0.45 m)^{3}\\= 332.67 W$

Thus, we can conclude that the total rate of heat transfer from the container to its surroundings ignoring radiation is 332.67 W.

3 0

3 years ago

What is the energy Q released when 131 53Idecays and 131 54Xe is formed? The atomic mass of 131 53I is 130.906118 u and the atom

DanielleElmas [232]

Answer:0.967meV

Explanation:

-Find the difference in u, so 130.906118-130.90508= 0.001038u

- convert to meV

1 u = 931.494meV

multiply 0.001038 by 931.494

=0.001038 X 931.494

0.967 meV

5 0

4 years ago

The cork in Question 1 travels I foot in moving from its lowest position to its highest position. What is the average velocity o

tatiyna

Answer:

8ft/s

Explanation:

For computing the average velocity of the cork first we have to determine the frequency which is shown below:

$Frequency = \frac{Time\ taken }{one\ minute}$

$= \frac{240}{60\ seconds}$

= 4 Hz

Now the average velocity of the cork is

$\frac{\lambda}{2} = 1 ft\\\\ \lambda = 2ft\\\\ velocity = f\times \lambda \\\\$

= 8ft/s

We simply applied the above formulas to determine the frequency and the velocity of the cork during this motion and the same is to be considered

7 0

3 years ago

The 10-lb block has a speed of 4 ft>s when the force of F = (8t2) lb is applied. Determine the velocity of the block when it

Zanzabum

Answer:

The velocity of the block is 231650.8 ft/s

Explanation:

Knowing

W = 10 lb

v0 = u = 4 ft/s

F = 8 $t^{2}$ lb

ms = 0.2

Applying the newton second law

ΣFy = 0

N - W = 0 --> N = W = 10 lb

ΣFx = m $a_{x}$

F - ms N = ma

$8t^{2}$ - 0.2(10) = $\frac{10}{32.2} a$

a = $3.22 (8t^{2} - 2)$

Using Kinematics

a = dv/dt

$\int\limits^v_u dv$ = $\int\limits^t_0 {a} \, dt$ = $\int\limits^t_o {3.22 (8t^{2} - 2)} \, dt$

v - 4 = 3.22 $(\frac{8}{2} t^{3} - 2t)$

when t = 30

v = 231650.8 ft/s

5 0

3 years ago