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3 years ago

If oxygen and steel wool are combined is it a physical change or chemical change?

Physics

2 answers:

JulijaS [17]3 years ago

8 0

Answer:

Chemical change

Explanation:

If both combined it will be a chemical change

Physical change can be reversed easily; chemical change cannot be changed back to previous state

Anon25 [30]3 years ago

4 0

Answer:

I think it would be a chemical change.

Explanation:

Because a physical would be like crushing it or something along that line.

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Tarzan swings on a 35.0 m long vine initially inclined at an angle of 44.0◦ with the vertical. The acceleration of gravity if 9.

maks197457 [2]

Answer:

(A) Vf = 13.8 m/s

(B) Vf = 15.1 m/s

Explanation:

length of rope (L) = 35 m

angle to the vertical = 44 degrees

acceleration due to gravity (g) = 9.8 m/s^{2}

(A) from conservation of energy

final kinetic energy + final potential energy = initial kinetic energy + initial potential energy

0.5m(Vf)^{2} + mg(Hf) = 0.5m(Vi)^{2} + mg(Hi)

where

m = mass

Hi = initial height = 35 cos 44 = 25.17

Hf = final height = length of vine = 35 m

Vi = initial velocity = 0 since he starts from rest

Vf = final velocity

the equation now becomes

0.5m(Vf)^{2} + mg(Hf) = mg(Hi)

0.5m(Vf)^{2} = mg (Hi - Hf)

0.5(Vf)^{2} = g (Hi - Hf)

0.5(Vf)^{2} = 9.8 x (25.17 - 35)

0.5(Vf)^{2} = - 96.3 (the negative sign tells us the direction of motion is downwards)

Vf = 13.8 m/s

(B) when the initial velocity is 6 m/s the equation remains

0.5m(Vf)^{2} + mg(Hf) = 0.5m(Vi)^{2} + mg(Hi)

m(0.5(Vf)^{2} + g(Hf)) = m(0.5(Vi)^{2} + g(Hi))

0.5(Vf)^{2} + g(Hf) = 0.5(Vi)^{2} + g(Hi)

0.5(Vf)^{2} = 0.5(Vi)^{2} + g(Hi) - g(Hf)

0.5(Vf)^{2} = 0.5(6)^{2} + (9.8 x (25.17 - 35))

0.5(Vf)^{2} = -114.3 ( just as above, the negative sign tells us the direction of motion is downwards)

Vf = 15.1 m/s

5 0

3 years ago

Read 2 more answers

Calculate the power required of a 60-kg person who climbs a tree 5 meters high in 10 seconds.

Alina [70]

Answer:

Explanation:

Power = Energy/time

-Don't have energy so I'm gonna solve for it

Gravitational Potential Energy = mass x gravity x height

= 60 kg x 9.8 m/s2 x 5m

= 2940 J

Power = Energy/time

=2940 J/10 s

= 294 W

3 0

2 years ago

PLEASE HELP ASAP!!!

Mama L [17]

C landslide I believe

8 0

3 years ago

57. Estimate Potential Energy A boulder with a

Oksanka [162]

Answer: 4.9 x 10^6 joules

Explanation:

Given that:

mass of boulder (m) = 2,500 kg

Height of ledge above canyon floor (h) = 200 m

Gravita-tional potential energy of the boulder (GPE) = ?

Since potential energy is the energy possessed by a body at rest, and it depends on the mass of the object (m), gravitational acceleration (g), and height (h).

GPE = mgh

GPE = 2500kg x 9.8m/s2 x 200m

GPE = 4900000J

Place result in standard form

GPE = 4.9 x 10^6J

Thus, the gravita-tional potential energy of the boulder-Earth system relative to the canyon floor is 4.9 x 10^6 joules

3 0

3 years ago

A 2kg book is held against a vertical wall. The coefficient of friction is 0.45. What is the minimum force that must be applied

Vika [28.1K]

We have that for the Question "A 2kg book is held against a vertical wall. The coefficient of friction is 0.45. What is the minimum force that must be applied on the book, perpendicular to the wall, to prevent the book from slipping down the wal" it can be said that the minimum force that must be applied on the book is

F=44N

From the question we are told

A 2kg book is held against a vertical wall. The coefficient of friction is 0.45. What is the minimum force that must be applied on the book, perpendicular to the wall, to prevent the book from slipping down the wal

Generally the equation for the Force is mathematically given as

$F=\frac{mg}{\mu}\\\\F=\frac{2*9.8}{0.45}\\\\$

F=44N

Therefore

the minimum force that must be applied on the book is

F=44N

For more information on this visit

brainly.com/question/23379286

8 0

2 years ago