3 years ago

What is the relationship between Earth's temperature and the number of sunspots that occur?

2 answers:

5 0

Answer: When there is an increased number of sun spots, it means the surface temperature is decreased which will decrease the temperature of the Earth's surface as well

Explanation:

pychu [463]3 years ago

3 0

Answer:

A (An increased number of sunspots causes an increase in Earth's temperature.)

Explanation:

EDG 2021

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Using the formula 1/2 (m x v2), what is the kinetic energy of a 4 kg rock falling through the air at 5 m/s

aivan3 [116]

Answer:

KE = 50J

Explanation:

$KE = \frac{1}{2}mv^{2} \\\\ KE = \frac{1}{2}(4)(5)^{2} \\\\ KE = 2(25) \\\\ KE = 50J$

5 0

3 years ago

Blood is accelerated from rest to 30.0 cm/s in a distance of 1.80 cm by the left ventricle of the heart. (a) Make a sketch of th

Mila [183]

Answer:

a. Picture attached

b. V, X

c. $t=0.12 s$

d. It makes sense cosidering that a normal heart beat rate is between 60 and 100 beats per minute (bpm).

Explanation:

First we have to identify the unknown of this problem:

$a: acceleration\\t: time$

Considering the characteristics of the problem and that distance and velocity are specified, the acceleration is constant, for that reason we use the equations of uniformly accelerated motion as follows:

$v=v_{0}+at\\ x=x_{0}+ v_{0}+\frac{1}{2}at^{2}$

If we reorganize the equations, considering that $x_{0}$ and $v_{0}$ are zero because motion starts from rest , we have:

$a=\frac{v}{t} \\x=\frac{1}{2}at^{2} =\frac{1}{2}\frac{v}{t} t^{2}=\frac{1}{2} vt\\t=\frac{2x}{v} \\t=\frac{2*1.80cm}{30.0\frac{cm}{s} } \\t=0.12 s$

Finally, the analysis of the result leaves us to understand why the normal heart beat rate varies between 60 and 100 bpm.

6 0

3 years ago

Human populations all over the world burn fossil fuels to power cars, planes, and generate electricity. Select the statement tha

Eddi Din [679]

<span>A.) Burning fossil fuels pollutes the environment and our heavy reliance on them creates a long-term problem because they are not a renewable resource.</span>

7 0

4 years ago

Read 2 more answers

Sound wave frequency difference

motikmotik

Are u trying to ask what the difference between a sound wave and a frequency is?

6 0

3 years ago

When moving a suitcase, you exert a force of 700 N and push it 3.0 m. How much work have you done on the suitcase?

skad [1K]

Answer:

2,100J

Explanation:

Workdone=Force x distance

=700 x 3

=2,100 J

8 0

3 years ago