Physics: Post your doubts here!

[badrobot14]

a child of mass 35 kg movies down a sloping path on a skate board. the sloping path makes an angle 45 degree with the horizontal. the constant speed of the child along the path is 6.5 m/s. Calculate:
a) vertical dist through which child moves in 1.0s (done)
b) the rate at which potential energy is being lost (g=9.81 m/s^2) (confusion)

How is the answer to b) 80 J/s??

All I did was P = (35x9.81x0.51)/1 which gives answer 175 J/s (or 175 W)

A)
vertical distance moved: sin(45)=6.5/dist
dist = 0.7071*6.5
dist = 4.596

B)
rate at which potential energy is lost is just the energy change in one sec (i.e. vertical dist change in part A)
p.e = mgh = 35*9.81*4.596
p.e. = 1578 J/s

 

[Hannah Moore]

Hey everyone, if a person gets a wrong trend in the values in P3 physics Q.1. What is the procedure of marking for them.

 

[Lenny Lino]

Can I still fail if I pass? I must know, very important, what if I fail after I pass?? But I passed when I failed??!!? Tell me NOOOOOW, I am passing with fail on my exam tomorrow?

 

[Lemniscates]

Hey everyone, if a person gets a wrong trend in the values in P3 physics Q.1. What is the procedure of marking for them.

Hey Hannah Moore.

A wrong trend would likely result in the loss of marks for the trend itself and possibly for any related analysis/conclusion. However, candidates can still earn marks for accurate plotting, correct labeling, units, and methodical calculation of slope/intercepts.

I hope this helps.

 

[Lemniscates]

Can I still fail if I pass? I must know, very important, what if I fail after I pass?? But I passed when I failed??!!? Tell me NOOOOOW, I am passing with fail on my exam tomorrow?

I hope you are okay mate!

 

[Mostafa Egypt]

Hello everyone,
Does anyone have the leaked paper 3 variant 1 physics Exam that is going these days

 

[qpcottawa]

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