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Vladimir79 [104]
3 years ago
14

Read this conclusion from an informative essay.

Physics
2 answers:
Vaselesa [24]3 years ago
7 0

Answer:

the last one

Explanation:

a conclusion is basically a small summary at the end of a passage

Nesterboy [21]3 years ago
3 0

It sums up the key points. The question is why is it a good conclusion, so the only appropriate answer is summing it up.

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Potassium is a crucial element for the healthy operation of the human body. Potassium occurs naturally in our environment and th
Mariulka [41]

Answer:

a) 0.0288 grams

b) 2.6*10^{-10} J/kg

Explanation:

Given that:

A typical human  body contains about 3.0 grams of Potassium per kilogram of body mass

The abundance  for the three isotopes are:

Potassium-39, Potassium-40, and Potassium-41 with abundances are 93.26%, 0.012% and 6.728% respectively.

a)

Thus; a person with a mass of 80 kg will posses = 80 × 3 = 240 grams of potassium.

However, the amount of potassium that is present in such person is :

0.012% × 240 grams

= 0.012/100 × 240 grams

= 0.0288 grams

b)

the effective dose (in Sieverts) per year due to Potassium-40 in an 80- kg body is calculate as follows:

First the Dose in (Gy) = \frac{energy \ absorbed }{mass \ of \ the \ body}

= \frac{1.10*10^6*1.6*10^{-14}}{80}

= 2.2*10^{-10} \ J/kg

Effective dose (Sv) = RBE × Dose in Gy

Effective dose (Sv) =  1.2  *2.2*10^{-10} \ J/kg

Effective dose (Sv) = 2.6*10^{-10} J/kg

 

5 0
4 years ago
The part of the electromagnetic spectrum that the human eye can detect is divided into ultraviolet light, visible light and infr
NeX [460]

Answer:

false

Explanation:

we can only see wavelengths on the visible light spectrum. everything else is invisible to us

7 0
3 years ago
Read 2 more answers
An electric field of 1.65 kV/m and a magnetic field of 0.334 T act on a moving electron to produce no net force. If the fields a
Blizzard [7]

Answer:

4940.12 m/s

Explanation:

For the net force on the moving electron to be zero, the Magnetic force must then match the electric force.

Magnetic force = Electric force

Magnetic force = qvB

Electric force = Eq

qvB = Eq

v = (E/B)

E = Electric field = 1.65 kV/m = 1650 V/m

B = Magnetic field = 0.334 T

v = (1650/0.334)

v = 4940.12 m/s

Hope this helps!!

6 0
3 years ago
Read 2 more answers
Cockroach of mass m lies on the rim of a uniform disk of mass 4m that can rotate freely about its center like a merry-go-round.
Brrunno [24]
The angular velocity of the cockroach does not change as long as it rotates with the disk it has the same angular velocity as the disk but by changing the distance from the center of the disk the linear velocity changes (V=r×ω) because the radius changes.
in order to find the kinetic energy you can use this formula k=1/2 × m × V²
so  k/k0 = (V/V0)² = (r/r0)²
where the subscripts 0 denotes to the initial position of the cockroach so r0=2×r then we have k/k0=1/4
3 0
4 years ago
Puck 1 (0.5 kg) travels with velocity 80 m/s to the right when it collides with puck 2 (2 kg) which is initially at rest. After
mr Goodwill [35]

Answer:

v_2=24\ m/s

Explanation:

It is given that,

Mass of puck 1, m_1=0.5\ kg

Mass of puck 2, m_2=2\ kg

Initial speed of puck 1, u_1=80\ m/s

Initial speed of puck 2, u_2=0\ m/s

After the collision, the speed of puck 1, v_1=-16\ m/s

Let v_2 is the final velocity (in m/s) of puck 2 after the collision. Using the conservation of momentum as :

m_1u_1+m_2u_2=m_1v_1+m_2v_2

0.5\times 80+2\times 0=0.5\times (-16)+2v_2

v_2=24\ m/s

So, the final velocity of the puck 2 after the collision is 24 m/s. Hence, this is the required solution.

3 0
4 years ago
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