Physics, 09.09.2021 14:00 crookdamian21

Đặt vào 2 đầu dây dẫn 1 hiệu điện thế 12V thì cho được cường độ dòng điện qua dây là 2A . Hãy tính hiệu điện thế phải đặt vào 2 đầu dây để cường độ dòng điện chạy qua dây tăng thêm 0,5A nữa?

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Answer from: Quest

the answer is a 3.8cm

explanation:

An object is located 5.0 cm from a concave mirror. the focal length is 15.0 cm. what is the image di

Answer from: Quest

i would like to make dinner for my mom, dad, and sister

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.

Answer from: Quest

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

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Đặt vào 2 đầu dây dẫn 1 hiệu điện thế 12V thì cho được cường độ dòng điện qua dây là 2A . Hãy tính h...

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