Find the current i1 in the following circuit where r1=r2=3ω and r3=6ω. (hint: find i2, i3 and i4, first and i1=i2 i3 i4. Voltage on the wire at the top is 24v higher than that at the bottom).

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?