Back to School Week - Tuesday: Physics! - Page 2 - Jesters&Heralds

Back to School Week - Tuesday: Physics!

zAquisgran [11]

Professional

Posts: 866

Location: Möhnesee

Tuesday, September 8th 2020, 9:24pm

Quoted from "Atrocitus"

If the taken distance of free falling object is 65 meter in last 1 sec, what is current speed of object?

234 kmh or 145,401 miles per hour
(kind of like good mens tennisserve at US Open atm :smile:

)

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Atrocitus [5]

Intermediate

Posts: 577

Tuesday, September 8th 2020, 9:43pm

Quoted from "zAquisgran"

Quoted from "Atrocitus"

Boiling point decreases as altitude increases
So answer is

1) boil on mountain

Unfortunatly wrong as you chosen the wrong answer, even with argumenting in correct direction.

"If you boil water at a higher pressure (below sea level, for example), the boiling point would be higher than 100 °C . At a lower pressure (like in the mountains), the boiling point is a lower temperature."

As we have a higher boiling point in lower areas the water just gets hotter before
transforming to gas - so egg is cooked faster

Ooh what a trick xd

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Atrocitus [5]

Intermediate

Posts: 577

Tuesday, September 8th 2020, 10:01pm

h-->distance
u-->first velocity
v-->last velocity
g-->gravitational acceleration (10 bcs practical xd)
t-->time xd

h=u*t + (g*t*t)/2 (*)

u = 60 m/s (*)

v*v=u*u + 2gh (**)

v = 70 m/s (**)

You can do for g=9,8 if your answer are correct its okay

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--IBRA-- [10]

Forum Noob

Posts: 35

Tuesday, September 8th 2020, 10:12pm

what does the first principle of dynamics say?

also known as the lazy a** principle

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Atrocitus [5]

Intermediate

Posts: 577

Tuesday, September 8th 2020, 10:16pm

It says

If there is no net force on an object, then its velocity is constant. Either the object is at rest (if its velocity is equal to zero), or it moves with constant speed in a single direction.

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--IBRA-- [10]

Forum Noob

Posts: 35

Tuesday, September 8th 2020, 10:23pm

correct

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zAquisgran [11]

Professional

Posts: 866

Location: Möhnesee

Tuesday, September 8th 2020, 10:42pm

Water temperature is divided in 0-100 degrees from frozen to boiling.

In how many parts is it divided if you change in Fahrenheit?

a) 100
b) 150
c) 180
d) 200

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Baltazar_Blake [15]

Intermediate

Posts: 204

Tuesday, September 8th 2020, 10:45pm

Quoted from "zAquisgran"

Water temperature is divided in 0-100 degrees from frozen to boiling.

In how many parts is it divided if you change in Fahrenheit?

a) 100
b) 150
c) 180
d) 200

c) 180

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zAquisgran [11]

Professional

Posts: 866

Location: Möhnesee

Tuesday, September 8th 2020, 10:46pm

Quoted from "Baltazar_Blake"

]c) 180

correct

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--Arya-- [13]

Forum Noob

Posts: 26

Tuesday, September 8th 2020, 11:13pm

What is the role of KMnO4(potassium permanganate) in redox titration?

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Baltazar_Blake [15]

Intermediate

Posts: 204

Tuesday, September 8th 2020, 11:14pm

Quoted from "--Arya--"

What is the role of KMnO4(potassium permanganate) in redox titration?

It is an absorbent of toxic gas; Electrolyte purification.It has a role in soil and water treatment remediation.

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Atrocitus [5]

Intermediate

Posts: 577

Tuesday, September 8th 2020, 11:18pm

Using as indicator

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--Arya-- [13]

Forum Noob

Posts: 26

Tuesday, September 8th 2020, 11:20pm

Quoted from "Atrocitus"

Using as indicator

Correct

Quoted from "Baltazar_Blake"

Quoted from "--Arya--"

What is the role of KMnO4(potassium permanganate) in redox titration?

It is an absorbent of toxic gas; Electrolyte purification.It has a role in soil and water treatment remediation.

It's true but i asked for redox titration .It's correct too .