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4 years ago

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As an object is undergoing free fall motion.As it falls the objects?,speed increases,acceleration increases,both of these,or non

e

1 answer:

Alex_Xolod [135]4 years ago

4 0

The speed will increase, as there is acceleration, while the acceleration will remain constant, as gravity is constant.

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How is a simple machine different from a compound machine?

sergij07 [2.7K]

a compound machine is made of several simple machines

the difference is like a tree and a jungle

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2 years ago

In a ballistic pendulum, a spring pushes a ball from rest It ies through the air and sticks in the base of a pendlum that swings

Marysya12 [62]

Answer:

The final velocity is $\bf{562.9}$ .

Explanation:

Given:

The maximum angle that the pendulum and the ball system can travel, $\theta_{m} = 45^{0}$ .

The length of the pendulum, $l = 30~cm$ .

The mass of the pendulum, $m_{p} = 250~g$ .

The mass of the ball, $m_{b} = 76~g$ .

Consider that the initial velocity of the ball-pendulum system is $v_{i}$ . So the initial total energy of the system is given by

$E_{i} = K.E. + P.E.\\~~~~= \dfrac{1}{2}(m_{b} + m_{s})v_{i}^{2} + 0\\~~~~= \dfrac{1}{2}(m_{b} + m_{s})v_{i}^{2}$

Consider the final velocity of the ball is $v_{0}$ and the final height attended by the system is $h$ . So the final total final energy of the system is given by

$E_{f} = K.E. + P.E.\\~~~~~= 0 + (m_{b} + m_{s})gh\\~~~~~= (m_{b} + m_{s})gh$

From the conservation of energy,

$E_{i} = E_{f}\\&or,& \dfrac{1}{2}(m_{b} + m_{s})v_{i}^{2} = (m_{b} + m_{s})gh\\&or,& v_{i} = \sqrt{2gh}$

From the conservation of momentum,

$&& m_{b}v_{0} = (m_{b} + m_{s})v_{i}\\&or,& v_{0} = (1 + \dfrac{m_{p}}{m_{b}})\sqrt{2gh}$

The final height attended by the system is given by

$h = l(1 - \cos 45^{0}) = 8.787~cm$

The final velocity is given by

$v_{0} = (1 + \dfrac{250}{76}})\sqrt{2(980)(8.787)}\\~~~~= 562.9$

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4 years ago

You drop a rock down a well and hear a splash 3 s later. As Charlie Brown would say, the well is 3 seconds deep. How fast is the

vampirchik [111]

Since it was dropped, it should be the speed of gravity which is 9.8 meters/second

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2 years ago

In general, the ________ of a simple machine is the ratio of the distance over which the force is applied to the distance over w

KATRIN_1 [288]

The answer that best fits the blank provided above is MECHANICAL ADVANTAGE. Given that in simple machines, output should not be greater than the input therefore, the Mechanical advantage of a simple machine has its input forces multiplied instead which results in force amplification. The answer for this would be option A.

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3 years ago

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How are contact forces and field forces different ?

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3 years ago