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3 years ago

Explain each Mechanical weathering: Chemical weathering:

1 answer:

3 0

Mechanical weathering is the process of breaking big rocks into little ones. This process usually happens near the surface of the planet. Temperature also affects the land. The cool nights and hot days always cause things to expand and contract. That movement can cause rocks to crack and break apart.

Chemical weathering occurs when chemical reactions weaken and decompose rocks, often acting alongside the physical breakdown of rock, aka mechanical weathering. This process involves a chemical change, which actually alters the rock's or mineral's chemical composition.

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An object with a density of 0.85 g/cc is dropped into each of the two beakers shown below. Beaker 1 has a density of 0.5 g/cc. B

Oliga [24]

Answer:

The object will sink in the liquid in beaker 1.

The object will float in the liquid in beaker 2

Explanation:

The density of an object relative to the density of a fluid determines if the object floats or sink in a fluid. The density of a material is the measure of the amount of mass of that material packed into a unit volume of that material.

For the beaker 1, the liquid in this beaker has a density of 0.5 g/cc, which is lesser than the density of the object (0.85 g/cc). This means that the object will add more mass than there should be to the volume of the space it displaces within the field. This results in the object sinking in the fluid.

For beaker 2, the liquid in this beaker has a density of 1 g/cc, which is more than the density of the object (0.85 g/cc). This means that the object will add less mass than there should be to the volume of the space it displaces within the field. This results in the object floating in the fluid.

8 0

4 years ago

A cyclist makes the following trip along two vectors; he travels 9km to the north and then travels 6km to the east

elena-14-01-66 [18.8K]

Answer:

Final distance from the origin: 10.82 km. the vector points as shown in the attached image.

Angle with respect to the east: $56.31^o$

Explanation:

Please refer to the attached image. The cyclist's trip is indicated with the green arrows (9 km to the north followed by 6 km to the east.

So his final position is at the tip of this last vector, and indicated by the orange vector drawn form the point where the trip starts to the cyclist's final location.

We observe that this orange vector is in fact the hypotenuse of a right angle triangle, and we can estimate the distance from the origin by the Pythagorean theorem:

$d=\sqrt{9^2+6^2} \\d=\sqrt{81+36} \\d=\sqrt{117} \\d=10.82 \,\,km$

Notice that this is NOT the actual number of km that the cyclist pedaled to reach the final point.

Now, to find the value of the angle $\theta$ , we need to use trigonometry, and in particular the tangent function gives us the ratio between the side of the triangle "opposite" to the angle, divided the side "adjacent" to the angle:

$tan(\theta)=\frac{opp}{adj} \\tan(\theta)=\frac{9}{6}\\tan(\theta)=\frac{3}{2}\\$

Now we can find the value of the angle by using the arctan function:

$tan(\theta)=\frac{3}{2} \\\theta=arctan(\frac{3}{2} )\\\theta= 56.31^o$

6 0

3 years ago

A bus travels 300 km south along a straight path with an average velocity of 85 km/h to the south. The bus stops for 22 minutes.

Kruka [31]

a) Answer;

= 6.72 hours

Explanation and solution;

velocity = distance over time

Since we know the velocity and the distance, we can simply calculate time

For the first part

85 km/h = 300km / time

time = 3.53 hours

Then there is a 22 min stop, which is the same as 0.37 hours

so far the trip is:

3.53 + 0.37 = 3.9 hours

then for the last stretch:

78 km/h = 220 km / time

time = 2.82 hours

So the total trip is:

3.9 + 2.82 = 6.72 hours

b) Answer;

= 77.38 km/hr

Explanation and solution;

we take the total distance divided by the total time to get the average.

total distance = 300 km + 220 km = 520 km

total time = 6.72 hours

Average velocity = 520 km / 6.72 hours = 77.38 km/hr

5 0

3 years ago

A person jumps from the roof of a house 3.5-m high. When he strikes the ground below, he bends his knees so that his torso decel

Korvikt [17]

The force exerted on his torso by his legs during the deceleration is 4365 N.

Explanation:

Mass of the torso m=45kg

Height of the building s=3.5 m

Decelerating distance=0.71 m

when he jumps to the ground, the only acceleration is acceleration due to gravity g

motion1 from top to ground

initial velocity u=0

we have to calculate final velocity v using the following equation of motion.

$v^2-u^2=2gs\\v^2-0^2=2\times 9.8\times3.5=68.6\\v=\sqrt{68.6} \\=8.3$

use height of the building as the distance s as the jump from top to the ground is only described here.

Motion 2 on the ground

v=0

u=8.3(final velocity of motion 1)

The deceleration after striking the ground can be calculated from the equation of motion

$v^2-u^2=2as\\\\a=v^2-u^2/2\times 0.71\\=0^2-8.3^2/0.71=97 m/s^2$

The decelerating distance is used in the place of s since since the motion after hitting the ground is described in this case.

The equation of force is

$F=ma\\=45\times 97=4365 N$

6 0

3 years ago

How acceleration and gravitation (acceleration) are related/different?

mihalych1998 [28]

The source of acceleration (without gravity) is transfer of energy from one object to another or change of its own energy structure so that one of its components changes into increasing energy of motion.
But gravity occurs with no measurable energy transfer nor is the gravitating mass changing its energy structure in order to produce gravity.
If the cause of acceleration and gravity is not related at all is the Equivalence principle just a coincidence that the resulting effects are physically identical and indistinguishable

5 0

4 years ago

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