Weight, in physics elaborately is a type of force which pertains to the gravitational attraction of the earth and the mass of the object.
Hence, the formula for weight is mass x gravity.
Mathematically - w = m x g
Solution:
Mass = 8 kg
Gravity = 10 m/s2
Weight = 10 x 8
Weight = 80 kg*m/s2 or 80N
Therefore the weight of the 8 kg object is 80 newton.
Answer:
f = 6.57
×
10
¹⁵H
z
Explanation:
Given:
r
=
0.053
n
m = 5.3
×
10
⁻¹¹m is the electron orbit radius
In order to determine the frequency of the electron motion, we first equate the Coulomb force due to the electrostatic attraction between proton and electron to the centripetal force of the circular motion. We have:
mv²/r² = kq²/r²
Here we want to get v so we isolate it:
v
=
√
k
q
²/m
r
We then recall that the speed in uniform circular motion is:
v
=
2
π
r
f
So we replace everything and substitute:
2
π
r
f =
√
k
q
²/
m
r
We isolate the frequency here:
f
=
(
1
/2
π
r
) × (
√
k
q
²/m
r
)
We insert the term inside the square root to get a singular term of the form:
f
=
√
k
q
²/4
π
²m
r
³
We substitute and use the charge and mass of an electron here:
f
=
⎷
(
9
×
10
⁹
N
m
²/
C
²)
(
1.602
×
10
⁻¹⁹C
)²/4
π
²
(
9.109
×
10
⁻³¹k
g
)
(
5.3
×
10
⁻¹¹m
)
³
We will get:
f = 6.57
×
10
¹⁵H
z
Answer:
UV light is more powerful as it has greater energy.
Explanation:
The energy propagated by electromagnetic waves ( light ) through vacuum or medium is known as electromagnetic radiation.
The frequency/wavelength range of electromagnetic radiation is known as electromagnetic spectrum. The electromagnetic spectrum ranging from gamma ray to radio waves.
Frequency range of UV light = ( 8 x 10¹⁴ to 3 x 10¹⁶ ) Hz
Frequency range of Microwaves = ( 300 x 10⁶ to 300 x 10⁹ ) Hz
Ratio of UV light to Microwaves = ( to )
= ( 2.66 x 10⁶ to 1 x 10⁸ )
Energy of electromagnetic radiation is given by the relation:
E = hν
Here h is plank's constant and ν is frequency.
UV light is more powerful than Microwaves as frequency of UV light is greater than frequency of microwaves. Thus, by the above equation, the energy of UV light is more than energy of Microwaves.
Answer:
kg - one thousand grams; the basic unit of mass adopted under the Systeme International d'Unites; "a kilogram is approximately 2.2 pounds"
Explanation: