Physics, 10.10.2019 05:30 samtuck33

Complete each statement about the sign of the work done on a baseball. carlton catches a baseball and his hand moves backward as he brings the ball to a halt, doing work on the baseball. carlton throws a baseball, doing work on the baseball. carlton carries a baseball in his hand as he rides his bicycle in a straight line at constant speed, doing work on the baseball. carlton carries a baseball in his hand as he rides his bicycle in a straight line with increasing speed, doing work on the baseball.

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Answer from: 245cat

Answer and Explanation:

The work done is negative as the force is applied in the forward direction and the displacement of the hand is in the backward direction.The work done is positive as the work is done on the baseball by Carlton. Moreover, both the force applied and the displacement of Carlton are in a straight line in the forward direction.The work done in this case is zero as Carlton rides with constant speed, the Kinetic energy too remains constant and hence net work done is zero.The work done in this case is positive as the work is done on the baseball by Carlton and as the velocity changes its Kinetic energy also varies wit it. Also the force applied and the displacement of Carlton in this case are in the directed to the same path.

Answer from: Quest

The answer is b hope this

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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