Physics, 01.09.2019 06:50 Xaviiier

You are traveling upstream on a river at dusk. you see a buoy with the number 4 and a flashing red light. what should you do?

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Upstream or upriver is a term which is used when you are travelling against the direction of the flow of the river. There are some markers or symbols which are telling us something or how we should pass.
when you are travelling at dusk and you see a buoy with number 4 and a flashing red light you should keep the buoy on the starboard side that is on the right side. buoy with number 5 or any other number will indicate something different.

Answer from: Quest

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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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You are traveling upstream on a river at dusk. you see a buoy with the number 4 and a flashing red l...