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# Physics ! ... who can help me in these questions !

0
480
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+1832

From 3 to 6

physics
Aug 10, 2014

#3
+32822
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The temperature of a mix of ice and water in equilibrium at 1 atmosphere pressure is defined as 0°C.  This is the same as 273K (strictly it's 273.15, but what's 0.15K among friends!). (I'm assuming it's pure water.  If it's salty water, that's used to define 0°F.)

And you are correct about centripetal acceleration.

Aug 11, 2014

#1
+32822
+10

3.  If there were a net force on the plane it would accelerate (or decelerate) - i.e. its speed would be changing - but the plane is travelling at constant speed so there must be zero net force on it.

4.  Think of light going from, say, glass to air.  Total internal reflection can occur.  The refractive index of glass is greater than that of air.

5.  273K (approx).

6.  This is already done in the picture!

Aug 10, 2014
#2
+1832
0

what is the information you based on in question 5 !!

In question 6 the answer is  (B) east!

becaus it centripetal acceleration? right!!

Aug 11, 2014
#3
+32822
+10