Why was the concern over global cooling replaced with a concern over global warming?

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Answer 1

Answer: During 1970s, same observations were seen as what we have observed today pertaining to our climate. Journals were discussing that there would be warming because of greenhouse gases emissions. Also, it was observed between the years 1970 to 1990 that there was a steady surface temperature increase. Due to this, people are now fixated with global warming rather than on global cooling.

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Question 4 4. Two blocks A of mass 15kg and B of unknown mass are connected by a light inextensible string on a rough horizontal surface. A constant force of magnitude 120N is applied onto block A at an angle of 30° to the horizontal as shown in the diagram below. The coefficient of kinetic friction for both blocks is 0.2 and the system of blocks accelerates to the right at 2.08m.s2. B Question 5 A 15 kg 30° 4.1. State Newton's Third law of motion in words 4.2. Draw a labelled free-body diagram for block A 4.3. Show that the frictional force acting on block A as it accelerates is 14.7N 4.4. Calculate the mass of block B [18] 120N (2) (5) (5) [16]
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If the mass of a sliding block is tripled while a constant net force is applied, by how much does the acceleration decrease?

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As we know that if a rock is sliding under the influence of some external force then By Newton's II law we have

$F = ma$

now we will have

$a = (F)/(m)$

now we know that if force remains constant while we tripled the mass of the block then

new acceleration of the block will be given as

$a' = (F)/(3m)$

so here the acceleration of the block will be decreased by 3 times

The pressure on a fluid is calculated as force/mass. True False

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the answer is false..

Nearly all physics problems will use the unit m/s^2 for acceleration. Explain why the seconds are squared. Why isn't the unit given as m/s, as it is for speed

Answers

Because acceleration is not speed, and speed is not acceleration.
I'm sure you would not ask "Why isn't temperature given in acres,
as it is for area ?" Speed and acceleration are different things, so
it's only natural that they have different units.

The magnitude (size) part of acceleration is:

   (how much speed changes) per second.

Are you speeding up ?
Are you traveling (2 meters per second) faster every second ?
Then your acceleration is

   (2 meters per second) per second .

When you write that phrase as an algebraic expression, it's

   (2 m/sec) / sec

and when you simplify that fraction, you get    2 m/sec² .

Who will give me answer I will give you brainliest.....

Answers

1 . W=mass times acceleration due to gravity
60kg times 9.8m/s2
= 588N

2. W=mg
1176N=m times 9.8
m=120kg

3. 1 hour=3600s
24 hours=?
24 times 3600
= 86400 seconds

4. 1000g=1kg
25000g=?
25000 times 1 divide by 1000
=25kg

5. 1000000mg=1kg
123000000=?
123000000 times 1 divide by 1000000
=123 kg

Radium-226 is unstable. What is the process that allows the nucleus of radium-226 to become more stable? Question 14 options: A. ionic bonding B. radioactive decay C. hydrogen bonding D. covalent bonding E. nuclear fusion

Answers

Answer: The correct answer is Option B.

Explanation:

We are given a radioisotope which is unstable in nature. For this isotope to become stable, it has to undergo radioactive decay. There are various processes by which a radioisotope may decay:

1. Alpha decay: In this decay process, a heavier nuclei decays into lighter nuclei. The particle released is alpha particle.

$_Z^A\textrm{X}\rightarrow _(Z-2)^(A-4)\textrm{Y}+_2^4\alpha$

2) Gamma decay: In this decay process, an unstable nuclei gives excess energy by a process of spontaneous electromagnetic process. This decay process releases $\gamma -radiations$ .

$_Z^A\textrm{X}^*\rightarrow _Z^A\textrm{X}+_0^0\gamma$

3) Beta-plus decay: In this decay process, a neutron gats converted into a proton and an electron. The particle released is $\beta-particle$

$_Z^A\textrm{X}\rightarrow _(Z+1)^A\textrm{Y}+_0^(-1)\beta$

4) Beta-minus decay: In this decay process, a proton gets converted into a neutron and an electron neutrino which is known as a positron particle. This is also known as $\beta ^+$ -decay.

$_Z^A\textrm{X}\rightarrow _(Z-1)^A\textrm{Y}+_(+1)^0e$

Radium-226 nuclei undergoes alpha decay to form Radon-222 nuclei by releasing alpha-particle.

$_(88)^(226)\textrm{Ra}\rightarrow _(86)^(222)\textrm{Rn}+_2^4\alpha$

Hence, the answer is Option B.

the correct answer for this question is radio active decay or option b ! press brainliest...

The age of the universe is thought to be about 14 billion years. Assuming two significant figures, write this in powers of ten in years

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14x10^9 remember to hit that thanks button and rate 5 stars please!!!!

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