19 ohm resistor, and across the parallel resistors
14 Calculate the length of a constantin wire of
diameter 0.6 mm and resistivity 1.1 x 10-6
Sem required to construct a standard resistor of
resistance 35 92.
(SCIGCE)
15 A battery of three cells in series, each of e.m.f.
2 V and internal resistance 0.5 N is connected
to a 2 12 resistor in series with a parallel
combination of two 3 12 resistors. Draw the
circuit diagram and calculate:
the effective external resistance
b. the current in the circuit
the lost volts in the battery
d. the current in one of the 3 12 resistors.
(SC/GCE)
of a cell is greater than
a.
C.

Time to return to same height=1.1632 s

Explanation:

This is a projectile motion

ux=1.2 m/s ,

uy=5.7 m/s

Time to return to same height =t= 2uy/g =2*5.7 /9.8 =1.1632 sec

Horizontal range =uxt =1.2*1.1632 =1.3959 m

Horizontal velocity remains same. But Vertical velocity will change. When it reaches same height it will attain same velocity. But after that vertical velocity will change due to gravity and covers a distance of s= 3.49 m.

Final vertical velocity vy, then  vy2=uy2+2gS =5.72+2*9.8*3.49 =100.894 or vy=10.044 m/sec

Magnitude of velocity when it hits water is =sqrt(1.22 +10.0442) =10.116 m/sec

Time to return to same height=1.1632 s