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DaniilM [7]
3 years ago
14

One important relationship between chemical and mechanical weathering is ________. 1. mechanical weathering forms more brittle m

aterials that are easily broken down by chemical weathering.2. mechanical weathering can produce smaller pieces of rock that have more surface area for chemical weathering to work on. 3. chemical weathering can produce smaller pieces of rock that can then be modified by mechanical weathering 4. chemical weathering can form brittle materials that are easily broken into smaller pieces by mechanical weathering
Physics
1 answer:
Paha777 [63]3 years ago
5 0

Answer:

2. mechanical weathering can produce smaller pieces of rock that have more surface area for chemical weathering to work Explanation:

Mechanical weathering involves activities of living organisms or some geological processes. The bigger rocks are usually reduced to smaller rocks and further reduction might be limited or not posibble mechanically. This reduced rocks now increases the surface area available for chemical weathering; which further reduces the sizes of the rocks below the size range of mechanical weathering. one will recall that the rate of chemical reaction increases with exposed surface area.

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A 0.400-kg object is swung in a circular path and in a vertical plane on a 0.500-m-length string. If the angular speed at the bo
Talja [164]

Answer:

T = 16.72 N

Explanation:

When the object is swung in a circular path, and in a vertical plane, there are two forces external to the object acting on it at any time: the gravity (which is always downward) and the tension in the string (which always points towards the center of the circle).

At the bottom of the circle, the tension is directly upward, so these two forces, are opposite each other, and the difference between them is the centripetal force , which at this point, keeps the object swinging in a circle.

This is the point of the trajectory where T is maximum.

We can apply Newton's 2nd Law, choosing an axis vertical (y-axis) being the upward direction the positive one, as follows:

T- m*g = m*a

The acceleration, at the bottom of the circle, is only normal (as there are no forces in the horizontal direction) , and is equal to the centripetal acceleration, as follows:

ac =  v² / r = ω²*r⇒ T- m*g = m*ω²*r

Replacing by the givens, we can solve for T as follows:

T = m* (ω²*r+g) = 0.4 kg*((8.00)² rad/sec²*0.5m)+9.8 m/s²) = 16.72 N

5 0
3 years ago
A 0.017-kg acorn falls from a position in an oak tree that is 18.5 meters above the ground.
Genrish500 [490]

Answer:

Velocity= 19.05 m/s

Kinetic energy= 3.08 J

Explanation:

The corn possess potential energy. Feom law of conservation of energy, all the potential eneegy will be converted to kinetic energy, with negligible friction.

Potential energy, PE= kinetic energy, KE

Potential energy is given by mgh while kinetic energy is given by 0.5mv^{2}

Equating

mgh=0.5mv^{2}

Making v the subject of the formula then

v=\sqrt {2gh}

Substituting 9.81 m/s2 for g and 18.5 m for h then the velocity will be

v=\sqrt {2\times 9.81\times 18.5}=19.0517715711689\ m/s\\v\approx 19.05\ m/s

To get the kinetic eneegy, since PE=KE AND KE is

KE=0.5mv^{2}

Substituting v with 19.05 and m with 0.017 kg we have

0.5\times 0.017\times 19.05^{2}=3.08467125/ J\approx 3.08 J

This can also be achieved by mgh since PE=KE hence 0.17*9.81*18.5=3.085245 J and the results are slightly different due to small energy losses and rounding off of values.

7 0
3 years ago
Which statement best describes covalent bonding?
chubhunter [2.5K]

b- electrons are shared between two atoms

6 0
3 years ago
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What causes small grain igneous rock to form? What causes large -grained igneous rock to form
Lunna [17]
Weather the rock was formed above ground or below ground

I hope this helped:)
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3 years ago
The velocity of a car increases from 2.0 m/s to 16 m/s in a time
Crazy boy [7]

Answer:

4.0 m/s

Explanation:

acceleration = (16-2) /3.5 = 4 m/s

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3 years ago
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