Physics, 28.01.2020 18:00 xandreaii

Which of the following statements about energy is correct? a. energy is a vector quantity. b. energy is the force used to move an object. c. energy is required to set an object in motion or d. energy can be stored, but it can never be transformed or transferred.

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Answer from: mendezj67

C. Energy is required to set an object in motion.

Answer from: lol9691

Energy is never created.

Energy can move matter.

Energy is never destroyed.

i know this right because i just did it

Explain:

According to the law of conservation of energy, energy isn’t created or destroyed. It can displace matter from one place to another.

Answer from: Quest

i dont think you are wrong for wanting to get even with someone who did you wrong.

(i'm an eye for an eye kind of person) but if this person hurt you in a sexual way, i dont suggest doing anything to him. he should be taken to the proper authorities, you could go to jail depending on what you do. if it was something small like your sibling took your spot on the couch, than yea, i would get even with him by taking one of his favorite snacks lol. but i dont suggest you doing anything illegal.

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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