Let's evaluate each choice. For the first choice, this is correct. Hydrosphere consist of all the water's in the Earth's surface. It interacts with the atmosphere through reaeration, so that water cycle continues on. The second option is correct, this is known as the greenhouse effect. The third option is incorrect, because the opposite is true, which makes the fourth option correct. The fifth option is incorrect because the atmosphere has nothing to do with the Earth's crust. So, the answers are: A, B, and D.
Let's evaluate each choice. For the first choice, this is correct. Hydrosphere consist of all the water's in the Earth's surface. It interacts with the atmosphere through reaeration, so that water cycle continues on. The second option is correct, this is known as the greenhouse effect. The third option is incorrect, because the opposite is true, which makes the fourth option correct. The fifth option is incorrect because the atmosphere has nothing to do with the Earth's crust. So, the answers are: A, B, and D.
Oldest rocks in California are considered to be the ancient metamorphic rocks which are schist and gneiss and are ranged in age from about 1.4 billion years to 1.7 billion years.
These old metamorphic rocks are derived from the older sedimentary, metamorphic and igneous rocks and were highly subjected to heat, pressure, partial melting and recrystallization that occurred during the period of mountain building which is associated with the continental collisions of the tectonic plates which existed long ago in Earth's history. Such rocks are found in the Grand canyon of California.
Oldest rocks in California are considered to be the ancient metamorphic rocks which are schist and gneiss and are ranged in age from about 1.4 billion years to 1.7 billion years.
These old metamorphic rocks are derived from the older sedimentary, metamorphic and igneous rocks and were highly subjected to heat, pressure, partial melting and recrystallization that occurred during the period of mountain building which is associated with the continental collisions of the tectonic plates which existed long ago in Earth's history. Such rocks are found in the Grand canyon of California.
Explanation:
The weight of the two blocks acts downwards.
Let the weight of the two blocks be W. Solving for T₁ and T₂:
w = T₁/cos 60° -----(1);
w = T₂/cos 30° ----(2);
equating (1) and (2)
T₁/cos 60° = T₂/cos 30°;
T₁ cos 30° = T₂ cos 60°;
T₂/T₁ = cos 30°/cos 60°;
T₂/T₁ =1.73.
Therefore, option a is false since T₂ > T₁.
Option B is true since T₁ cos 30° = T₂ cos 60°.
Option C is true because the T₃ is due to the weight of the two blocks while T₄ is only due to one block.
Option D is wrong because T₁ + T₂ > T₃ by simple summation of the two forces, except by vector addition.
Explanation:
First find the distance it takes to stop
s = [v^2-u^2]/2a = 0^2 - 8.7^2/2[-2.4] = 8.7^2/4.8
Next find the time it takes to go that distance , s = ut +[1/2] at^2
8.7^2/4.8 = 8.7t +[1/2] [ -2.4]t^2 , rearrange and
t^2 -[8.7/1.2]+ 8.7^2/[(1.2)(4.8)]=0 complete the square
[t - (8.7/2.4)]^2=0
t = 8.7/2.4 = 3.625 secs
At this stage the deceleration will push the object back in the direction it came from for another 3.625 secs when it will be 8.7 m/s again
Total time , T =2t = 7.25 secs.
Note:
The term differential is used in calculus to refer to an infinitesimal (infinitely small) change in some varying quantity. For example, if x is a variable, then a change in the value of x is often denoted Δx (pronounced delta x). The differential dx represents an infinitely small change in the variable x.
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