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Liono4ka [1.6K]
3 years ago
7

6. Drawing reliable conclusions from scientific evidence is important. Which of the following is a question that you can ask you

rself to evaluate the reliability of conclusions and claims made by other scientists? How much money did they spend on their experiment? What evidence supports the claim? Do I like their results? Do I agree with their claim?
Physics
1 answer:
Over [174]3 years ago
3 0

Answer:

What evidence supports their claim.

Explanation:

In the end, all that really matters in an experiment, is what scientific evidence supports the claim being made.

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A 1-kilogram ball has 8 joules of kinetic energy.What is it speed?
scZoUnD [109]
K.E=0.5*mv²
v=square root 2ke/m
v= square root 2*8J/1 kg
v= 4 m/s
3 0
3 years ago
A 5 kg projectile is fired at an angle of 25o above the horizontal. Its initial velocity is 200 m/s and just before it hits the
lina2011 [118]

Answer:

The change in the mechanical energy of the projectile is 43,750 J

Explanation:

Given;

mass of the projectile, m = 5 kg

initial velocity of the projectile, u = 200 m/s

final velocity of the projectile, v = 150 m/s

The change in mechanical energy is calculated from the principle of conservation of energy;

ΔP.E = ΔK.E

The change in potential energy is zero (0)

0 = ΔK.E

ΔK.E = K.E₁ - K.E₂

ΔK.E = ¹/₂mu² - ¹/₂mv²

ΔK.E = ¹/₂m(u² - v²)

ΔK.E = ¹/₂ x 5(200² - 150²)

ΔK.E =  43,750 J

Therefore, the change in the mechanical energy of the projectile is 43,750 J

4 0
3 years ago
A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the earth’s surface. w
Ksivusya [100]

speed of sound wave depends on elasticity of medium and density of medium

it is given by formula

v = \sqrt{\frac{E}{/rho}}

now if wave travel through solid then its speed is maximum while if it travel from gas then its speed is minimum

so initially its speed is given as 4000 m/s and suddenly decrease to 1500 m/s

so here we can say that its medium will change from solid to liquid

<em>so sound will encounter with water </em>

3 0
4 years ago
Read 2 more answers
Mark all the fermions a) Proton b) Electron c)Anti-top d) Gluon e) Tau Neutrino
aliya0001 [1]

Answer:

(a) Proton, (b) Electron (c) tau neutrino.

Explanation:

Elementary particles are the particles without any sub-structure which means they are not composed of other particles.

The elementary particles are classified into three categories which are discussed below:

(1) Quarks: up, down, top, bottom, strange, and charm.

(2) Leptons: electrons, electron neutrino, muon, muon neutrino, tau, tau neutrino.

(3) Bosons: Guon, photons Z bosons, W bosons, Higgs.

Fermions are particles that follow Fermi-Dirac statistics. Fermions consist of all the quarks and leptons. And fermions can also be categorized in elementary particles such as electrons and protons.

Therefore, the fermions in the given question are proton, electron, and tau neutrino.

5 0
3 years ago
An air mass gets its characteristic properties from an area known as the _____.
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The answer is source region
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3 years ago
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