2 years ago

What are 2 phenomenon that are caused by gravity

1 answer:

3 0

Gravity or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward (or gravitate toward) one another. - google

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How is humidity related to air pressure?

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Humid air has higher pressure because of the heaviness of the water

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Which of the following is true of our current knowledge of electrons?

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They have a negative charge and rotate around the nucleus

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A 3 kg mass object is pushed 0.6 m into a spring with spring constant 210 N/m on a frictionless horizontal surface. Upon release

Svetradugi [14.3K]

Answer with Explanation:

We are given that

Mass of spring,m=3 kg

Distance moved by object,d=0.6 m

Spring constant,k=210N/m

Height,h=1.5 m

a.Work done to compress the spring initially= $\frac{1}{2}kx^2=\frac{1}{2}(210)(0.6)^2=37.8J$

By conservation law of energy

Initial energy of spring=Kinetic energy of object

$37.8=\frac{1}{2}(3)v^2$

$v^2=\frac{37.8\times 2}{3}$

$v=\sqrt{\frac{37.8\times 2}{3}}$

v=5.02 m/s

c.Work done by friction on the incline, $w_{friction}=P.E-spring \;energy$

$W_{friction}=3\times 9.8\times 1.5-37.8=6.3 J$

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3 years ago

Which force is needed to give a 0.25-kg arrow an acceleration of 196 m/s2?

ludmilkaskok [199]

Force = mass × accelaration

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2 years ago

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Problem I Marcella (see warmup problem, above) gets her car moving steadily at 4m/s but suddenly someone stops ahead to assist h

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Answer:

Explanation:

a) KE = (1/2) * m * ( $v^{2}$ ) = F * d = 14m * 200N = 2800 m/N or 2.8 * $10^{3}$ m/N

b) 0J and 0m/s (if Marcella stopped after going 14 meters)

c) Known from part (a) that KE = 2800 J = F1 * d1,

2800J = F1 * (14m - 1m) => F1 = 2800J/13m = 215.384 N

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3 years ago