This chart shows the global temperature anomaly (the difference of the expected temperature and the actual temperature) over a s
pan of 130 years which facts related to climate change does the chart reveal?
(Note: Select all that apply)
1. From 1975 to 2010, temperatures on earth were higher than normal.
2. From 1880 to 1940, temperatures on earth were higher than normal.
3. The 10 warmest years in the time span all occurred in 1945.
4. The coolest year in the time span occurred 1945
5. Temperatures on earth do not fluctuate from from year to year
(Note: Select all that apply)
1. From 1975 to 2010, temperatures on earth were higher than normal.
2. From 1880 to 1940, temperatures on earth were higher than normal.
3. The 10 warmest years in the time span all occurred in 1945.
4. The coolest year in the time span occurred 1945
5. Temperatures on earth do not fluctuate from from year to year
2 answers:
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Solution :
Let kg
m/s
Let and
are the speeds of the disk
and
after the collision.
So applying conservation of momentum in the y-direction,
Therefore, the disk 2 have greater velocity and hence more kinetic energy after the collision.
Now applying conservation of momentum in the x-direction,
m/s
So,
= 4.33 m/s
Therefore, speed of the disk 2 after collision is 4.33 m/s
If no frictional work is considered, then the energy of the system (the driver at all positions is conserved.
Let
position 1 = initial height of the diver (h₁), together with the initial velocity (v₁).
position 2 = final height of the diver (h₂) and the final velocity (v₂).
The initial PE = mgh₁ and the initial KE = (1/2)mv₁²
where g = acceleration due to gravity,
m = mass of the diver.
Similarly, the final PE and KE are respectively mgh₂ and (1/2)mv₂².
PE in position 1 is converted into KE due to the loss in height from position 1 to position 2.
Therefore
(KE + PE) ₁ = (KE + PE)₂
Evaluate the given answers.
A) The total mechanical energy of the system increases.
FALSE
B) Potential energy can be converted into kinetic energy but not vice versa.
TRUE
C) (KE + PE)beginning = (KE + PE) end.
TRUE
D) All of the above.
FALSE
Let
position 1 = initial height of the diver (h₁), together with the initial velocity (v₁).
position 2 = final height of the diver (h₂) and the final velocity (v₂).
The initial PE = mgh₁ and the initial KE = (1/2)mv₁²
where g = acceleration due to gravity,
m = mass of the diver.
Similarly, the final PE and KE are respectively mgh₂ and (1/2)mv₂².
PE in position 1 is converted into KE due to the loss in height from position 1 to position 2.
Therefore
(KE + PE) ₁ = (KE + PE)₂
Evaluate the given answers.
A) The total mechanical energy of the system increases.
FALSE
B) Potential energy can be converted into kinetic energy but not vice versa.
TRUE
C) (KE + PE)beginning = (KE + PE) end.
TRUE
D) All of the above.
FALSE