Physics, 25.03.2021 06:40, yash797

4. The kinetic energy (KE) and gravitational potential energy (PE) for an object are shown Energy (J) as functions of time in the graph on the right. What is the change in total mechanical
energy of the object for the 5 seconds shown?
(A) 0 J
(B) 2.5 J
(C) 5 J
(D) 15 J

4. The kinetic energy (KE) and gravitational potential energy (PE) for an object are shown Energy (

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answered: Guest

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by mathematical calculations before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of uranus led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

answered: Guest

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.

answered: Guest

Ireally don’t know

answered: Guest

Wikis are written or edited by someone

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4. The kinetic energy (KE) and gravitational potential energy (PE) for an object are shown Energy (J...