Physics, 07.10.2019 08:30 twinkieslayer

What is the mass of a stone moving at a speed of
15 meters/second and having a momentum of
7.5 kilogram·meters/second?

Answers: 2

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Answers

Answer from: banna01man

Explanation:

Momentum means the ability or tendency of an atom to continue moving.

The relation between momentum, mass and speed or velocity is as follows.

p = m × v

where, p = momentum

m = mass of object

v = velocity of object

It is given that speed of stone is 15 m/s, and momentum is 7.5 kg m/s. Therefore, calculate the mass of a stone as follows.

p = m × v

$m = \frac{p}{v}$

= $\frac{7.5 kg m/s}{15 m/s}$

= 0.5 kg

Thus, mass of the stone is 0.5 kg.

Answer from: Quest

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.

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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