Physics, 28.01.2020 23:45 wutdmgamerz

Bicyclists in the tour de france reach speeds of 34.0 miles per hour (mi/h) on flat sections of the road. what is this speed in (a) kilometers per hour (km/h) and (b) meters per second (m/s)

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Answer from: coreyscott1281

a) The speed in km/hr is 54.7.

b) The speed in m/s is 15.2

Explanation:

a) The conversion used from miles to km is:

1 mile = 1.61 km

34.0 miles= $\frac{1.61}{1}\times 34.0=54.7km$

We are asked: 34.0 miles/hr = ? km/hr

Thus 34.0 miles/hr = $\frac{54.7}{1}=54.7km/hr$

Therefore, the speed in kilometer per hour is 54.7 km/hr

b) The conversion used from miles to m is:

1 mile = 1610 m

34.0 miles= $\frac{1610}{1}\times 34.0=54740m$

The conversion used from hour to sec is:

1 hour = 3600 sec

We are asked: 34.0 miles/hr = ? m/s

Thus 34.0 miles/hr = $\frac{54740m}{3600s}=15.2m/s$

Therefore, the speed in meters per second is 15.2 m/s

Answer from: Quest

Iwould say a is accurate

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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Bicyclists in the tour de france reach speeds of 34.0 miles per hour (mi/h) on flat sections of the...

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