Which of the following is an SI base unit for measuring mass?

Physics

1 answer:

Dimas [21]2 years ago

8 0

Answer:

I think its Pound or a gram

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Why are microwaves beneficial to use for transmitting information

Darya [45]

Microwaves. Microwave radiation can be used to transmit signals such as mobile phone calls. ... Certain microwave radiation wavelengths pass through the Earth's atmosphere and can be used to transmit information to and from satellites in orbit

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4 years ago

Whenever two apollo astronauts were on the surface of the moon, a third astronaut orbited the moon. assume the orbit to be circu

almond37 [142]

Missing question:
"Determine (a) the astronaut’s orbital speed v and (b) the period of the orbit"

Solution

part a) The center of the orbit of the third astronaut is located at the center of the moon. This means that the radius of the orbit is the sum of the Moon's radius r0 and the altitude ( $h=430 km=4.3 \cdot 10^5 m$ ) of the orbit:
$r= r_0 + h=1.7 \cdot 10^6 m + 4.3 \cdot 10^5 m=2.13 \cdot 10^6 m$
This is a circular motion, where the centripetal acceleration is equal to the gravitational acceleration g at this altitude. The problem says that at this altitude, $g=1.08 m/s^2$ . So we can write
$g=a_c= \frac{v^2}{r}$
where $a_c$ is the centripetal acceleration and v is the speed of the astronaut. Re-arranging it we can find v:
$v= \sqrt{g r}= \sqrt{(1.08 m/s^2)(2.13 \cdot 10^6 m)}=1517 m/s = 1.52 km/s$

part b) The orbit has a circumference of $2 \pi r$ , and the astronaut is covering it at a speed equal to v. Therefore, the period of the orbit is
$T= \frac{2 \pi r}{v} = \frac{2\pi (2.13 \cdot 10^6 m)}{1517 m/s} =8818 s = 2.45 h$
So, the period of the orbit is 2.45 hours.

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3 years ago

What will it be the critical angle if light is incident from glass n=1.5 in to the air n=1

Alika [10]

Answer: 42°

Explanation:

1sin90 = 1.5sinθ

θ = 42°

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3 years ago

Infrared radiation from the sun has a wavelength of 6200 nm. calculate the energy of one photon of that radiation

Mama L [17]

The Planck–Einstein relation relates the energy of a photon to its wavelength:
E = h*ν = h*c/λ
where ν is the frequency of the photon,
λ is its wavelength,
c is the speed of light in a vacuum, and h is Planck's constant = 6.626*10^(-34) J*s

In this case, the energy of a photon with a wavelength of 6200nm is equal to:

E = .(6.626*10^(-34) J*s)*(2.998*10^8 m/s)/(6200*10^-9 m)

E = 3.20*10^(-20) J

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3 years ago

Name three types of stress that a force can cause inside an object?

Anton [14]

Answer:

Explanation:

Stress is the force applied to a rock and may cause deformation. The three main types of stress are typical of the three types of plate boundaries: compression at convergent boundaries, tension at divergent boundaries, and shear at transform boundaries.

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4 years ago