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A platinum bar measures 5.0 cm long, 4.0 cm wide, and 1.5 cm thick. It has a mass of 750.0 grams. Don't forget to find the volume of the bar (L X W X H). Use the formula D=m/v Calculate the density of the platinum bar (you need the volume first). Enter your answer in the space provided.

look at me answering a question from 2017 its 2021 \(^o^\) (/^o^)/

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C is correct tho I just took the test '^'

Answer:

8.5m/s

Explanation:

Given the initial velocity to be 12m/s at an angle of 45° to the ground. The horizontal component of the velocity can be expressed as U cos (theta) where;

U is the initial velocity of the object

theta is the angle between the initial velocity and the horizontal. Mathematically, Ux = Ucos(theta)

Ux = 12cos45°

Ux = 12×1/√2

Ux = 12×√2/2

Ux = 6√2m/s

Ux = 8.48m/s

Ux = 8.5m/s(to nearest tenth)

Answer:c) variation in the population exists

Explanation:

Answer: C) variation in the population exists.

Explanation:

Based on Darwin, the most important requisite for natural selection is the variance in the genetics of the individuals of some species.

These differences, produced by mutations, may have a positive effect or a negative effect in the life of the subjects, where, statistically, the positive mutations will prevail as the species reproduces.

So the right answer would be C, Variation in the population exists.

In the field of Chemistry, an Atom is a tiny piece of matter, an Element is a substance that cannot be broken down into a simpler substance, a Particle is the basic unit of an element, and a Phase is a unique form of matter in which it can exist.

The correct matches for these definitions are as follows:

These are basic terms in chemistry and understanding them can help you in your study of matter, its properties, and how it changes.

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Ken lives in an agricultural society where his community engages in farming and animal domestication for subsistence and income. The community is settled, which contrasts with nomadic hunter-gatherer or pastoral societies, and revolves around horticulture or intensive agriculture.

Ken lives in an agricultural society. This type of society is rooted in farming and domestication of animals for subsistence and income. With settled communities, Ken's society has shifted from the nomadic lifestyle of hunter-gatherer or pastoral societies to a more stationary form of living where they cultivate land and breed domestic species for food. As agriculture allows for surplus production, it also enables the development of specialized occupations, trade, and the creation of settled villages, which can develop into more complex sociopolitical structures.

In Ken's community, where extensive horticulture or intensive agriculture is practiced, members of the community may be part of a peasant class in their nation-states, working small plots of land within a larger regional economy. Despite the advancements that technology brings to smooth out the harshness of existence, such societies are dependent on their environmental ecosystems, and any changes to them can significantly impact their way of life.

The power of a wave measures the amount of energy the wave transmits in per unit time

The correct option that could increase the power of a wave in a spring is option D.

D. All of the above

The reason the selected option is correct is given as follows;

The power of a wave in a string is given by the following equation;

Where;

μ = The string's mass per unit length

ω = The wave's angular frequency

A = The wave amplitude

v = The velocity of propagation of the wave

[tex]v = \sqrt{\dfrac{T}{\mu} }[/tex]

T = Tension in the string

Increasing the power of the wave in a string, can be done by either;

Therefore, all the options are correct

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Answer:

Part a)

[tex]v_{avg} = 37.5 m/s[/tex]

Part b)

[tex]a = 2.25 m/s^2[/tex]

Part c)

[tex]d = 750 m[/tex]

Explanation:

Part a)

Since we know that bus is moving uniformly from initial speed of 15 m/s to 60 m/s in 20 seconds

So we will have

[tex]v_{avg} = \frac{d}{t}[/tex]

we know that

[tex]d = \frac{v_f + v_i}{2} t[/tex]

so we have

[tex]v_{avg} = \frac{v_f + v_i}{2}[/tex]

[tex]v_{avg} = \frac{15 + 60}{2}[/tex]

[tex]v_{avg} = 37.5 m/s[/tex]

Part b)

As we know that acceleration is rate of change in velocity

so it is given as

[tex]a = \frac{v_f - v_i}{t}[/tex]

[tex]a = \frac{60 - 15}{20}[/tex]

[tex]a = 2.25 m/s^2[/tex]

Part c)

distance moved by the bus is given as

[tex]d = v_{avg} \times t[/tex]

[tex]d = 37.5 \times 20[/tex]

[tex]d = 750 m[/tex]

The evaporated water cools and drops get closer together happens in the atmosphere to the water in order for the clouds to form.

The continual flow of water from the earth's surface to the atmosphere and back to the ground is known as the water cycle, or hydrologic cycle. It is a never-ending process. As a result, it lacks a beginning and an end. As a result, water has been in motion on earth since the planet's formation. In the process, water transitions between the solid, liquid, and gas phases. The water cycle is aided by a number of elements, including the sun and air currents, to mention a few.

Water from wells, lakes, ponds, the sea, rivers, and many other sources evaporates throughout the daytime in the presence of sunshine, and this water vapor rises with the heated air. The air cools as it rises, causing water vapor to condense into tiny droplets that eventually become clouds.

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To solve this we must be knowing each and every concept related to collisions. Therefore, the correct option is option A among all given options.

Two items collide when they briefly come into touch with one another. To put it another way, a collision is a brief reciprocal encounter between two masses in which the momentum or energy of the masses change.

Total momentum, total energy, and full kinetic energy are all conserved in an elastic collision. The forces engaged in the brief encounter are preserved in nature, therefore the entire mechanical energy also isn't changed into a different energy type.  If there is energy lost in the collision to sound, heat, etc., the collision is inelastic.

Therefore, the correct option is option A.

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Answer:

Kinetic energy and mass are directly proportional.

Explanation:

The kinetic energy of an object is given by:

[tex]K=\frac{1}{2}mv^2[/tex]

where

m is the mass of the object

v is the speed of the object

From the equation above, we see that the kinetic energy (K) depends linearly on the mass (m), so kinetic energy and mass are directly proportional to each other.

The weight(force of gravity) of the child is: D. 98 Newton.

Given the following data:

We know that the acceleration due to gravity (a) of an object on planet Earth is equal to 9.8 meter per seconds square.

To calculate the weight(force of gravity) of the child:

Mathematically, the weight(force of gravity) of an object or body is calculated by using the following formula;

[tex]Weight = mg[/tex]

Where:

Substituting the given parameters into the formula, we have;

[tex]Weight = 10[/tex] × [tex]9.8[/tex]

Weight(force of gravity) = 98 Newton

Therefore, the weight(force of gravity) of the child is 98 Newton.

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Answer:

700j

Explanation:

Answer:

c) wedge

Explanation:

Student uses a magnet to move a 0.025 kg metal ball magnet exerts a force of 5 N which causes the ball to begin moving than the acceleration of the ball when it begins to move is 200 m/s².

A force in physics is an effect that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Given in the question student uses a magnet to move a 0.025 kg metal ball magnet exerts a force of 5 N then the acceleration is given as,

F = ma

a = F/m

a = 5/0.025

a =  200 m/s²

The acceleration of the ball when it begins to move is 200 m/s².

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The color of stars with the highest surface temperature is bluish, and the color of stars with the lowest surface temperature is reddish.

The color of a star primarily depends on its surface temperature. Hotter stars emit more energy and tend to appear bluish, while cooler stars emit less energy and appear reddish. This is due to the fact that hotter objects emit more high-energy, short-wavelength light, which corresponds to the blue end of the spectrum. Conversely, cooler objects emit more lower-energy, long-wavelength light, associated with the red end of the visible spectrum. For example, a star with a surface temperature around 10,000 °C will appear blue or bluish-white, while a star with a surface temperature around 3,000 °C will appear red. This correlation between color and temperature is vital for astronomers, as the color index provides a way to measure the temperatures of stars. The color of stars effectively acts as a sort of cosmic thermometer, allowing astronomers to deduce various characteristics of a star including its size, age, and chemical composition.

The correct answer is Actinides.

Answer:

B.The pin pushes the bowling ball toward the left.

Explanation:

As stated by Newton's third law:

"When any object A exerts a force on another object B, then object B exerts an equal and opposite force on object B". These two forces are called action and reaction.

In this example, the ball is our object A, while the pin is object B. We are told that the ball exerts a force on the pin, toward the right: therefore, the pin must exerts an equal and opposite force on the ball. So this force will be in the opposite direction, therefore toward the left.

Answer:

It’s B

Explanation:

Hope this helps!

Kinetic energy increases with increases in both mass and velocity, with velocity having a more significant impact due to its squared relationship in the kinetic energy formula KE = 0.5 x m x v².

The factors that cause kinetic energy to increase are an increase in mass and an increase in velocity. From the information given, kinetic energy is proportional to the mass of an object and to the square of its velocity, which is represented by the equation KE = 0.5 times m times v². Therefore, if we double the mass of an object, its kinetic energy would double, and if we double its velocity, its kinetic energy would quadruple, demonstrating a much more significant increase in kinetic energy with an increase in velocity. This principle underscores the profound influence of velocity on kinetic energy variations, elucidating the intricate interplay between mass, velocity, and energy manifestations in physical systems.

Final answer:

Distance is a scalar quantity denoting the total path length traveled, while displacement is a vector quantity signifying the change in position in a specific direction from start to end point.

Explanation:

The difference between distance and displacement lies in their definitions. Distance refers to the total length of the path traveled irrespective of direction, and is considered a scalar quantity because it only has magnitude. Conversely, displacement is a vector quantity, which means it has both magnitude and direction. Displacement is defined as the straight line distance in a specific direction from the starting point to the ending point.

For example, if you walk around a track that forms a perfect 400-meter circle and end up at the starting point, your distance traveled would be 400 meters, but your displacement would be zero, as there was no change in your position from start to finish. If, however, you walk a straight line from the start to a point 100 meters away, your distance and your displacement would both be 100 meters, the latter also including the direction from the starting point.

In physics, for calculating work done or gravitational force, it is important to consider displacement rather than just distance, since direction is a vital component of these calculations.

Answer:

a and d

Explanation: