Physics, 07.11.2019 06:31 romeojose2005

Acyclist travels 80 m south and then 150 m west. what is the distance traveled in km?

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Answer from: davinedmcneal

The distance, d = 230 m

Explanation:

The distance is a scalar quantity and it is defined as how much ground an object covered to move from initial location to the final location.

It doesn't depend on which direction the object traveled.

The distance is always positive and non-zero.

Unlike the displacement, which is only depended upon the initial and final position of the coordinate without considering the path traveled, distance depends on the path of travel.

Given,

The cyclist traveled south, S = 80 m

The cyclist traveled west, W = 150 m

The total distance traveled, d = S + W

= 80 + 150

= 230 m

Hence, the total distance traveled by the cyclist, d = 230 m

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.

Answer from: Quest

not too sure thinking all accelerations are pointed down

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