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2 years ago

Who is the president of Africa

Physics

2 answers:

defon2 years ago

8 0

Currently, the president of Africa is Jacob Gedleyihlekisa Zuma.

djverab [1.8K]2 years ago

8 0

Jacob Gedleyihlekisa Zuma is the president of South Africa. He was elected in 2009, and reelected in 2014.

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15) What is the momentum of a 280 kg motorcycle moving with a velocity of 15 m/s?

enot [183]

Answer:

Explanation:

6 0

2 years ago

With what type of electromagnetic radiation would you observe:

Viefleur [7K]

Answer:

Green part of the visible spectrum.

X ray part of the electromagnetic spectrum.

Infrared part of the electromagnetic spectrum.

Explanation:

Wien's displacement law

$\lambda_{max}=\frac{b}{T}$

Where, b = Wien's displacement constant = 2.898×10⁻³ mK

T = Temperature in kelvin

$\lambda_{max}=\frac{2.898\times 10^{-3}}{5800}\\\Rightarrow\lambda_{max}=0.499\times 10^{-6}=0.5\mu m=500\ nm$

So, the wavelength would be of around the green part of the visible spectrum.

$\lambda_{max}=\frac{2.898\times 10^{-3}}{1\times 10^6}\\\Rightarrow\lambda_{max}=2.898\times 10^{-9}=2.898\ nm$

So, the wavelength would be of around the X ray part of the electromagnetic spectrum.

Human body temperature = 37°C = 37+273.15 = 310.15 K

$\lambda_{max}=\frac{2.898\times 10^{-3}}{37+273.15}\\\Rightarrow\lambda_{max}=\frac{2.898\times 10^{-3}}{310.15}\\\Rightarrow\lambda_{max}=9.34\times 10^{-6}=934\ nm$

So, the wavelength would be of around the Infrared part of the electromagnetic spectrum.

5 0

3 years ago

A ray of light makes an angle of 10° with the horizontal above it and strikes a plane mirror which is inclined at an angle O to

Serggg [28]

180 - (40 * 2) = 100°

So the answer is (D) 100°

Hope this helps! :)

7 0

3 years ago

A 0.43-kg object mass attached to a spring whose spring constant is 561 N/m executes simple harmonic motion. If its maximum spee

VLD [36.1K]

Answer:

0.22 m

Explanation:

m = 0.43 kg, K = 561 N/m

Vmax = 8 m/s

Let the amplitude of the oscillations be A.

The formula for the angular frequency of oscillation sis given by

$\omega = \sqrt{\frac{K}{m}}$

$\omega = \sqrt{\frac{561}{0.43}}$

ω = 36.1 rad/s

The formula for the maximum velocity is given by

Vmax = ω x A

A = Vmax / ω

A = 8 / 36.1 = 0.22 m

4 0

3 years ago

I need help someone please...

hram777 [196]

D. Polar is your answer

8 0

3 years ago