As series resistors are added, the resistance is added directly so the total resistance will be equal to
Since the power is determined as
We have there that
The power is inversely proportional to the increase in resistance, so it will tend to decrease as more resistors are added in series.
The correct answer is: C.
Answer:
Time, t = 8 seconds
Explanation:
An object is thrown upward from the top of a 128-foot building with an initial velocity of 112 feet per second. The height h as a function of time t is given by :
We need to find the time when the object will hit the ground. When it will hit the ground, h = 0
So,
On solving the above quadratic equation, we get the value of t = 8 seconds. So, after 8 seconds the object will hit the ground. Hence, this is the required solution.
Explanation:
Given that,
Diameter of the wheel, d = 70 cm = 0.7 m
Initial angular speed,
Final angular speed,
Time, t = 4 s
(a) Angular acceleration,
(b) Tangential acceleration is :
Angular speed of the wheel after 2 seconds is :
Radial acceleration will be :
Hence, this is the required solution.