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3 years ago

PHYSICS! I AM TIMED!

Physics

2 answers:

Lana71 [14]3 years ago

8 0

28J because mechanical energy is the sum of the potential energy and kinetic energy

ludmilkaskok [199]3 years ago

3 0

Answer:

28 J, because mechanical energy is the sum of the potential energy and kinetic energy .

Explanation:

Mechanical energy is the combination of the kinetic and potential energy.

Kinetic energy is the energy that an object will have due to its motion.

Whenever an object's state or position is considered, it is called potential energy. For example, a bird sitting on top of a tree at some height is said to possess potential energy.

Whenever an object has velocity, it will have kinetic energy.

It is maximum when the potential energy is a minimum or zero, when total energy of an object or a system is conserved.

Similarly, whenever an object or a system has maximum potential energy, its kinetic energy is a minimum or zero.

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50 points question (Who is known as father of science)Albert Einstein

Zepler [3.9K]

Answer:

Albert Einstein is known as the father of science.

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3 years ago

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A ball of silly putty hits andsticks to a bowling ball that was initially at rest. After thecollision, the total kinetic energy

Jobisdone [24]

Answer:

3. less than the kinetic energy of thesilly putty before the collision.

Explanation:

This is because kinetic energy is dependent on the mass and velocity of an object. Mathematically, it is given as:

K. E. = ½*m*v²

Where m = mass

v = velocity

In the case of the silly putty, we know that the masses of the ball of silly putty and the bowling ball are conserved, hence, the kinetic energy depends solely on the velocity at which the object moves.

After the collision with the bowling ball, because of how heavy a bowling ball is, the speed of the silly putty and bowling ball will definitely be less than the speed of the silly putty before collision, i. e. u > v.

Hence, the kinetic energy after collision will be less than the kinetic energy before collision.

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3 years ago

A tray is moved horizontally back and forth in simple harmonic motion at a frequency of f = 2.07 Hz. On this tray is an empty cu

Anettt [7]

Answer:

Explanation:

Given

Frequency of SHM is $f=2.07\ Hz$

Amplitude of SHM is $A=3.13\ cm$

Cup begins to slip when it overcomes the friction force

Friction force $F_s=\mu mg$

Applied force $F=ma$

$ma=\mu mg$

$a=\mu g$

and maximum acceleration during SHM is

$a=A\omega ^2$

$a=A(2\pi f)^2$

$a=3.13\times 10^{-2}\times (2\pi 2.07)^2$

$a=5.296\ m/s^2$

$\mu =\frac{a}{g}$

$\mu =\frac{5.296}{9.8}=0.54$

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4 years ago

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Starting from rest, approximately how far does an object fall freely in 3 seconds?

Sergio039 [100]

Hi! In 3 seconds the object will fall approximately 44 meters.

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4 years ago

Can someone help pleaseeee

Eduardwww [97]

Answer:

Motion with constant velocity of magnitude 1 m/s (uniform motion) for 4 seconds in a positive direction and then for 2 seconds uniform motion with constant velocity of magnitude 3 m/s in reverse direction .

Explanation:

The graph shows a constant velocity of 1 m/s for 4 seconds in the positive direction. After that, between 4 seconds and 6 seconds, the object reverses its motion with constant velocity of magnitude 3m/s.

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3 years ago