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Sonja [21]
3 years ago
7

When using repeated trials during a scientific investigation, scientists should find the average of their data for use in their

final report. True or False?
Physics
1 answer:
yuradex [85]3 years ago
5 0
Generally speaking, it's a decent choice but not optimal, even sometimes leading to fatal.

Some fatal data should be filtered out before doing any mathematical manipulation, and there are lots of methods to manipulate data, average data sometimes makes no sense.
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This 200-kg horse ran the track at a speed of 5 m/s. What was the average kinetic energy?
MrRissso [65]

Answer:

<h2>2500 J</h2>

Explanation:

The average kinetic energy can be found by using the formula

k =  \frac{1}{2} m {v}^{2}  \\

m is the mass

v is the velocity

From the question we have

k =  \frac{1}{2}  \times 200 \times  {5}^{2} \\   = 100 \times 25

We have the final answer is

<h3>2500 J</h3>

Hope this helps you

5 0
3 years ago
The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particl
Lyrx [107]

Answer:

a)    F = 21.16 N,  b)     a = 3.17 10²⁸ m / s

Explanation:

a) The outside between the alpha particles is the electric force, given by Coulomb's law

          F = k \frac{ q_1 q_2}{r^2}

in that case the two charges are of equal magnitude

          q₁ = q₂ = 2q

let's calculate

         F = 9 \ 10^9 \ \frac{ (2 \ 1.6 \ 10^{-19} )^2 }{ (6.60 \ 10^{-15} )^2 }

         F = 21.16 N

this force is repulsive because the charges are of the same sign

b) what is the initial acceleration

         F = ma

         a = F / m

         a = \frac{21.16}{4.0026 \ 1.67 \ 10^{-27} }21.16 / 4.0025 1.67 10-27

         a = 3.17 10²⁸ m / s

this acceleration is in the direction of moving away the alpha particles

7 0
3 years ago
a 0.0780 kg lemming runs off a 5.36 m high cliff at 4.84 m/s. what is its kinetic energy when it's 2.00 m above the ground
Blababa [14]

Answer:

KE_2 = 3.48J

Explanation:

Conservation of Energy

E_1 = E_2

PE_1+KE_1 = PE_2+KE_2

m*g*h+(1/2)m*v² = m*g*h+(1/2)m*v²

(0.0780kg)*(9.81m/s²)*(5.36m)+(.5)*(0.0780kg)*(4.84m/s)² = (0.0780kg)*(9.81m/s²)*(2m)+KE_2

4.10J+0.914J = 1.53J + KE_2

5.01J = 1.53J + KE_2

KE_2 = 3.48J

3 0
3 years ago
Comparing X-ray to radio wave, which has a shorter wavelength?
Daniel [21]

Answer:

x-ray

Explanation:

X-rays can penetrate through matter because of their high frequencies while radio waves are not able to do so as much. If you think about it, taking an x-ray requires a lot more energy than for radio waves to allow you to listen to songs on the radio. Hope this helps :)

6 0
3 years ago
I
Vikentia [17]

Answer: TV announcers intend to mean “change of speed” or “velocity” when they talk about “high rate of change”. According to physics, they mean “acceleration”.

Explanation:

6 0
3 years ago
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