3 years ago

In the Earth's mantle, heat is transferred in large convection currents. Within these currents,

Physics

2 answers:

chubhunter [2.5K]3 years ago

7 0

The answer is B. The hotter rock is less dense so rises. The cooler rock is more dense so sinks.

sertanlavr [38]3 years ago

4 0

B.) Hotter rock rises cooler rock sinks

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20 POINTS!!!

hram777 [196]

I think its inductance. If its not then I think its none of the above

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3 years ago

A beam of light strikes a mirror reflects off at the angle in which it hit the mirror. which term does the diagram below illustr

zavuch27 [327]

Answer:

B.) reflection

Explanation:

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3 years ago

During a race, a runner runs at a speed of 6 m/s. 2 seconds later, she is running at a speed of 10 m/s. What is the runner’s acc

Lapatulllka [165]

Let's calculate the average acceleration. It is the rate of changing speeds. Hence, we need to calculate the difference of speeds. 10-6=4 m/s. The rate is now $\frac{4m/s}{2s} =2m/s^2$ .
In general, the formula for the mean acceleration between two times 1 and 2 is given by:
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3 years ago

block of mass 0.5kg on a horizontal surface is attached to a horizontal spring of negligible mass and spring constant 50N/m . Th

Alisiya [41]

Answer:

Explanation:

The mass of the block is 0.5kg

m = 0.5kg.

The spring constant is 50N/m

k =50N/m.

When the spring is stretch to 0.3m

e=0.3m

The spring oscillates from -0.3 to 0.3m

Therefore, amplitude is A=0.3m

Magnitude of acceleration and the direction of the force

The angular frequency (ω) is given as

ω = √(k/m)

ω = √(50/0.5)

ω = √100

ω = 10rad/s

The acceleration of a SHM is given as

a = -ω²A

a = -10²×0.3

a = -30m/s²

Since we need the magnitude of the acceleration,

Then, a = 30m/s²

To know the direction of net force let apply newtons second law

ΣFnet = ma

Fnet = 0.5 × -30

Fnet = -15N

Fnet = -15•i N

The net force is directed to the negative direction of the x -axis

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3 years ago

hi :) is it true that zero acceleration means the object can be moving at constant velocity or at rest?

nirvana33 [79]

Answer:

Explanation:

Please let me know if my answer is correct

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3 years ago

Read 2 more answers