If the Earth was the size of a basketball, about 24 centimeters in diameter, about how thick is the Earth's crust?

A stonecutter's chisel has an edge area of 0.7 cm2. If the chisel is struck with a force of 42 N, what is the pressure exerted o

Fantom [35]

Answer:

The pressure is $P = 583333 \ N/m^2$

Explanation:

From the question we are told that

The area of the edge is $A = 0.72 cm^2 = 0.72 *10^{-4}\ m$

The force is $F = 42 \ N$

The pressure is mathematically represented as

$P = \frac{F}{A}$

substituting values

$P = \frac{42}{0.72*10^{-4}}$

$P = 583333 \ N/m^2$

5 0

3 years ago

A distracted driver is driving towards a turn where the edge of the road leads into a 75.0 m cliff. The velocity of the vehicle

Vlada [557]

As long as the car is on the road, it moves with a constant speed of 80km/h.

As soon as the car starts to fall down the cliff, it follows a parabolic motion. It means that it still moves with constant speed along the x axis, but it also starts to move along the y axis, with constant acceleration (i.e. the acceleration due to gravity).

The good thing about parabolic motions is that the two motions along the x and y axes are completely separable.

So, first of all, we need to know how long it takes for an object to fall for 75m. The equation of a constantly accelerated motion is

$s=s_0+v_0t+\dfrac{1}{2}at^2$

Where $s_0$ is the initial position, $v_0$ is the initial speed, and $a$ is the constant rate of acceleration. In our case, we start from an initial height of 75m, an initial (vertical!) speed of zero, and our acceleration is $-g$ . So, our equation becomes

$s=75-\dfrac{g}{2}t^2$

And we want to solve for the time when $s=0$ (i.e. we want to know how long will it take for the object to reach the ground). We have

$0=75-\dfrac{g}{2}t^2 \iff 75=\dfrac{g}{2}t^2 \iff \dfrac{2\cdot75}{g}=t^2 \iff t=\sqrt{\dfrac{150}{g}}$

(I'm discarding the negative solution because it wouldn't make sense)

Now that we've used the vertical motion to find out the falling time, we can go back to the horizontal motion. We know that the car moves for a certain amount of time at a certain speed. So, we simply have to plug our values in the $s=vt$ equation, to get

$s=80\sqrt\dfrac{150}{g}}$

This is how far from the base of the cliff the vehicle lands.

3 0

3 years ago

Find the power required to give a brick 90 J of potential energy in a time of 2.2 s .

Angelina_Jolie [31]

90 J / 2.2 s = 41 W. 41 Watts is the power required to give a brick 90 J of potential energy in a time of 2.2 s

7 0

4 years ago

We often see cracks on rocks and stones why

Paul [167]

Answer:

Due to the process of weathering and erosion.

Explanation:

As the rocks are made of different forms of minerals they may have an igneous, metamorphic or sedimentary origin. Hence the natural stone surfaces can be made of granite, lime, or even shale.

The process of physical weathering that is called as mechanical weathering of rocks tends to break them apart and leads to the development of crack and small openings.

The diurnal exposure of bare rocks to extreme temperatures of day and night leads to onion peeling and slowly with water as an agent of erosion lead to cracks in joints of rocks.

6 0

3 years ago

Natalie and Will are discussing socialization. Natalie says that socialization occurs when an animal becomes accustomed to the p

skad [1K]

The correct answer for this question is this one: "C. Neither Natalie nor Will." Natalie and Will are discussing socialization. Natalie says that socialization occurs when an animal becomes accustomed to the people in the household. Will says that socialization is easily attained if the animal is first exposed to humans after 12 weeks of age.

7 0

3 years ago

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