If we will connect the resistors 2ohms, 3ohms, 5ohms in series and the 10ohms resistance parallel then we get equivalent resistance of 5 ohms.
The equivalent circuit is,
R equivalent for the series connection is,
The equivalent resistance is 5 ohms.
So your friend is saying true.
The correct answer to the question will be D. a skydiver whose air resistance is equal to that of her weight.
EXPLANATION:
As per the first option, the point is situated outside of the spinning top whose rotational speed is constant. When a body moves in a circular path, its direction is always changed which produces an acceleration. The point present outside of the spinning top moves in a circular path. Hence, it experiences an acceleration.
As per the second option, the car on the freeway is experiencing a net force of -120 N. Here, the car experiences negative acceleration which opposes the motion.
As per the third option, a submerged beach ball whose buoyant force is eight times the force of gravity. Hence, there is net force on the submerged beach ball which will push the ball upward. Hence, the ball experiences an acceleration.
The third option is that the skydiver whose air resistance is equal to that of her weight. Here, the weight of the driver acts in vertical downward direction while air resistance acts in vertical upward direction. The net force acting on the driver is zero. Hence, the acceleration of the driver is zero.
Answer:
2.5kN.m
Explanation:
Torque is directly proportional to pitch diameter
= Ta/Tb= Da/Db
=120/Tb= 0.25/0.5
Tb= 2.469kN.m approx 2.5kN.m
Answer:
Consider the velocity-time graph attached below.
The velocity-time graph represents the acceleration of a body under a force.
We can see that is the graph that if a child release the ball above the ground at A, it hits the ground at B. Bounces back with a reaches the top again at C, and hits the ground again at D.
The slope of velocity time graph represents acceleration. From A to B, velocity in increasing constantly with respect to time, which means constant acceleration from A to B. AS velocity increase, momentum of the ball also increases, which results in the increase of Kinetic energy.
At B, the ball hits the ground, the velocity decreases, momentum decrease s, because kinetic energy is transferred from the ball to the ground, due to which the ball would not attain the same height after the bounce.
Then the velocity remains negative at C, which means that now the ball is moving in opposite direction till C. It reaches its new at height at C, which is not the same as that of A because of lost in Kinetic Energy, and fall again.