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4 years ago

PHYSICS! I AM TIMED!

Physics

2 answers:

Lana71 [14]4 years ago

8 0

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

ludmilkaskok [199]4 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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Which scientist is BEST known for research that led to the modern understanding

pogonyaev

Dalton is best known for research that led to the modern understanding of the atom.

Explanation:

John Dalton is recognised as father of atomic theory. This is because, he was the first researcher to postulate the basic property or a basic model of an atom. He used this postulates for his research in chemistry. Though most of the postulates he stated seemed to be modified in this era. But the concept of a tiny indivisible particle was introduced by him which lead to the research field of atomic particles. Though now they are not indivisible particles any more but still the recognition is given to him for opening a new stream of research. Thus, Dalton is best known for research that led to the modern understanding of the atom.

4 0

4 years ago

You and your friend are going bungee jumping! You wait directly below them with a camera. When they leap from the bridge they be

Alex

Answer:

The amplitude is $A = 90.2 \ m$

Explanation:

From the question we are told that

The frequency of when sound is approaching observer is $f = 392 Hz$

The frequency as the move away from observer is $f_ a = 330 \ Hz$

The time between the pitch are $t = 10 \ s$

Here you are the observer and your friends are the source of the sound

The period is mathematically evaluated as

$T = 2 t$

as it is the time to complete one oscillation which from on highest pitch to the next highest pitch

Now T can also be mathematically represented as

$T = \frac{2 \pi}{w}$

Where $w$ is the angular velocity

=> $\frac{2 \pi}{w} = 2 * 10$

=> $w = 0.314 \ rad/sec$

Now using Doppler Effect,

The source of the sound is approaching the observer

The

$f = f_o (\frac{v}{v- wA} )$

$392 = f_o (\frac{v}{v- wA} )$

Where A is the amplitude

So when the source is moving away from the observer

$f_a = f_o (\frac{v}{v+ wA} )$

$330 = f_o (\frac{v}{v+ wA} )$

Here $f_o$ is the fundamental frequency

Dividing the both equation we have

$\frac{392}{330} = \frac{f_o(\frac{v}{v-wA} )}{f_o(\frac{v}{v+wA}}$

$1.1878 = \frac{v+wA}{v-wA}$

$1.1878 v - 1.1878 wA = v+wA$

$1.1878 v = 2.1878 wA$

=> $A = \frac{(0.1878 * (330))}{(2.1878)* (0.314)}$

$A = 90.2 \ m$

7 0

3 years ago

What is the acceleration of a 100-kg mass that has a force of 50 n acting on it?

Andrei [34K]

F=ma
50=100a
a=50/100
a=0.5 m/s^2

6 0

3 years ago

A peg is located a distance h directly below the point of attachment of the cord. If h = 0.760 L, what will be the speed of the

Rufina [12.5K]

Answer:

Explanation:

Given

Pivot is at h=0.76 L

Where L is the length of String

Conserving Energy at A and B

$mgL=\frac{1}{2}mu^2$

where u=velocity at bottom

$u=\sqrt{2gL}$

After coming at bottom the ball completes the circle with radius r=L-0.76 L

Suppose v is the velocity at the top

Conserving Energy at B and C

$\frac{1}{2}mu^2=mg(2r)+\frac{1}{2}mv^2$

Eliminating m

$u^2=4r+v^2$

$v^2=u^2-4\cdot gr$

$v^2=2gL-4g(L-0.76L)$

$v^2=1.04gL$

$v=\sqrt{1.04gL}$

6 0

3 years ago

Ill mark brainliest!!!

navik [9.2K]

Answer: A

si, di, are expressed as negative and f is expressed as positive values.

Explanation:

When the object is located at a location in front of the focal point of a convex len, the image will always be located somewhere on the same side of the lens as the object. The image is located behind the object. In this case, the image will be an upright image and the image is enlarged

In this question, the relationship between the focal length, image distance di and object distance is

I/f = 1/di + 1/do that is

I/f - 1/di - 1/do = 0

The image size si is also negative since the image is a virtual image.

Therefore, si, di, are expressed as negative, f is expressed as positive values.

6 0

3 years ago