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an electron with velocity v=3x10 to the power 7 m/s describes a circular path in a uniform magnetic field of 0.2T perpendicular to it calculate the radius of the path?

prove that the equation of straight line which passes through the point (a cos^3a, sin^3a) & is perpendicular to the straight line x sec a+y cosec a=0 is x cos a-y sin a = a cos 2a.

entropy is not a good criteria for determining the spontanecity of a process.give reason.

60

Total surface area = inner curved surface area + outer curved surface area + area of 2 rings We will consider , R=outer curved surface area r=inner curved surface area h=given lenght =2πRh + 2πrh + πR^2 + πr^2 =π(r +R )+(2h + R-r ) After solving with valu...

In above sum R = outer radius r= inner radius Sorry for the mistake

If 3/4 th part is covered by water , remaining part will pe area of land I.e. 1-3/4= 1/4 th part Radius given=6370 , Area is sphere= 4πr^2 1/4(4*22/7*6370*6370) After solving we will get the ans as -- 127527400 km^2 Hope helped !

C.p.=360, profit = 40(given) S.p.= 360+40= 400 Let marked price is x, Discount =(100/9% of x)= x/9 Price after discount will be selling price of the article. X-(x/9)=400 8x/9=400 X=450.