Answer:
a
Explanation:
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Well , its a easy problem
By ohms law,
we have V= IR
Where V is the voltage applied across the wire and R is the resistance and I is the current
=> R = V/I
=> R = 12/0.3 = 40 ohm
Answer:
Work done, W = 84.57 Joules
Explanation:
It is given that,
Mass of the wooden block, m = 2 kg
Tension force acting on the string, F = 30 N
Angle made by the block with the horizontal, 
Distance covered by the block, d = 3 m
Let W is the work done by the tension force. It can be calculated as :


W = 84.57 Joules
So, the work done by the tension force is 84.57 Joules. Hence, this is the required solution.
Answer
C.The traditional flow of current is positive to negative and the flow of electrons is the opposite
Explanation:
Answer:
Yes, there will be collision.
Explanation
Initial relative velocity u = 34-5.4 = 28.6 m/s
required final relative velocity v = 0
Acceleration , suppose be a .
Distance traveled =d = 160 m
Using the formula for relative motion,
v² - u² = 2as
0 - 28.6²=2as
a = - 2.55 m s⁻².
Since this required value is more than maximum braking deceleration so , there will be collision.