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4 years ago

Describe the motion of an object:

Physics

1 answer:

Tamiku [17]4 years ago

3 0

Answer:

A. Here object is moving with increasing velocity

B. Here the object is moving with decreasing velocity that is it is decelerating

C. Here the initial and final velocity are the same so the object moves at constant velocity

D. Here the object started from rest but reached a certain velocity with time so a non zero acceleration was attained

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If you wanted to calculate the density of a baseball and you knew its mass and volume you would need the density formula and a(n

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D= Mass over Volume or M/V
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3 years ago

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A fighter plane flying at constant speed 420 m/s and constant altitude 3300 m makes a turn of curvature radius 11000 m. On the g

Arada [10]

Answer:

"Apparent weight during the "plan's turn" is 519.4 N

Explanation:

The "plane’s altitude" is not so important, but the fact that it is constant tells us that the plane moves in a "horizontal plane" and its "normal acceleration" is $\mathrm{a}_{\mathrm{n}}=\frac{v^{2}}{R}$

Given that,

v = 420 m/s

R = 11000 m

Substitute the values in the above equation,

$a_{n}=\frac{420^{2}}{11000}$

$a_{n}=\frac{176400}{11000}$

$a_{n}=16.03 \mathrm{m} / \mathrm{s}^{2}$

It has a horizontal direction. Furthermore, constant speed implies zero tangential acceleration, hence vector a = vector a N. The "apparent weight" of the pilot adds his "true weight" "m" "vector" "g" and the "inertial force""-m" vector a due to plane’s acceleration, vector $W_{\mathrm{app}}=m(\text { vector } g \text { -vector a })$

In magnitude,

$| \text { vector } g-\text { vector } a |=\sqrt{\left(g^{2}+a^{2}\right)}$

$| \text { vector } \mathrm{g}-\text { vector } \mathrm{a} |=\sqrt{\left(9.8^{2}+16.03^{2}\right)}$

$| \text { vector } \mathrm{g}-\text { vector } \mathrm{a} |=\sqrt{(96.04+256.96)}$

$| \text { vector } \mathrm{g}-\text { vector } \mathrm{a} |=\sqrt{353}$

$| \text { vector } \mathrm{g}-\text { vector } \mathrm{a} |=18.78 \mathrm{m} / \mathrm{s}^{2}$

Because vector “a” is horizontal while vector g is vertical. Consequently, the pilot’s apparent weight is vector

$\mathrm{W}_{\mathrm{app}}=(18.78 \mathrm{m} / \mathrm{s}^ 2)(53 \mathrm{kg})=995.77 \mathrm{N}$

Which is quite heavier than his/her true weigh of 519.4 N

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4 years ago

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Every action force has an opposite and equal reaction force. Determine which of these are action/reaction pairs. Check all that

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A girl leans against a wall and the wall pushes on the girl.

A baseball hits a glove and the glove pushes on the ball.

A cat rubs up against a tree and the tree pushes against the cat

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4 years ago

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If the net work done on an object is zero, what can you determine about the object's kinetic energy?(A) The object's kinetic ene

aev [14]

Answer:

(D) The object's kinetic energy is zero.

Explanation:

Work theory

Work (W) is defined as the product of force F) by the distance (d)the body travels due to this force:

W= F*d Formula ( 1)

The component of the force that performs work must be parallel to the displacement.

Kinetic Energy Theory

Kinetic energy is the energy associated with bodies that are in motion, depends on the mass and speed of the body.

Ek =(1/2)*m*v²

The kinetic energy, Ek, is measured in joules (J), the mass, m, is measured in kilograms (kg) and the velocity, v, in meters / second (m / s).

Relationship between work and kinetic energy

A body remains at rest if the force applied is zero or if it does not move. In both cases the work will be zero.

For work and kinetic energy to have a non-zero value, the body must be in motion.

In other words, the work is equal to zero if there is no displacement, so its speed will be zero, the same as its kinetic energy.

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4 years ago

The formal beginning of psychology occurred in Germany and the United States by which two men ?

o-na [289]

Answer: Two men who helped in the development of psychology in Germany was Wilhelm Wundt, and in United States was William James.

Explanation:

Wilhelm Wundt was a German scientist, who was the first person who introduced psychology. He studied the conscious experience as a part of scientific study. It emphasis the identification of the components of the consciousness. Introspection is the process through which conscious experiences can be analyzed.

William James was a scientist, native of U.S. His purpose was to study the function of behavior all over the world. This perspective was known as functionalism. This emphasizes over the fact that how mental activities helps how organisms fit into its surrounding environment.

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4 years ago