Plz help !!!!!! ................................

Answer:

(a) h = 16.53 m (b) t = 1.83 s

Explanation:

Given that,

The initial velocity of a ball, u = 18 m/s

When it reaches to the maximum height, its final velocity v will be 0. Let it goes to a maximum height of h meters.

Finding t using first equation of motion as follows :

v = u +at

Here, a = -g and v = 0

[tex]t=\dfrac{u}{g}\\\\t=\dfrac{18}{9.8}\\\\t=1.83\ s[/tex]

The time needed for the ball to reach its max height is 1.83 s.

Let h is the maximum height. Using second equation of motion to find it :

[tex]h=ut-\dfrac{1}{2}gt^2\\\\h=18(1.83)-\dfrac{1}{2}\times 9.8\times (1.83)^2\\\\h=16.53\ m[/tex]

So, it will go to a maximum height of 16.53 m.

Answer:

balanced: a train moving at a constant speed, the moon orbiting the earth at a constant speed, a lamp sitting on a desk, an apple hanging on a tree

unbalanced: a skier coming down a mountain, a car accelerating from the start line, a soccer ball after it was kicked, a parachuter falling to ground

Explanation:

all the balanced ones are either moving at a constant speed or are skill

all the unbalanced ones were disturbed by some sort of force causing them to accelerate, go faster, blah blah blah

Answer:

Some people have went through some things, but people will be people. I've heard people are born neutral, but are affected by the environment they live in.

Explanation:

Answer: Around 433 miles

Explanation:

Answer:

Black holes are some of the strangest and most fascinating objects in outer space. They're extremely dense, with such strong gravitational attraction that even light cannot escape their grasp if it comes near enough. so when in books, movies, songs, video games, comics, paintings, etc you can imagine the impossible. as in escaping a black hole

Explanation:

Answer:

why is friction possible to slip on the wet floor​

Explanation:

This is because the coefficient of friction μ and the therefore resultant force of limiting friction Fs is significantly reduced when a lubricant is introduced between the the two kinetic or static surfaces.

Answer:

Pls mark me brainliest. the ans

Explanation:

Wet floors have less friction so there is a lesser chance of slipping. This is because the coefficient of friction μ and the therefore resultant force of limiting friction Fs is significantly reduced when a lubricant is introduced between the the two kinetic or static surfaces.

Answer:

because the gravitational pull is maximum at the poles and decreases as it comes down toward the equator.

Answer:

5.0 kg

Explanation:

use the equation; (m1v1i) + (m2v2i) = (m1v1f) + (m2v2f)

Answer:

heat energy is the form of energy produced by heat

when we burn heat a type of enery is came

A) Heritability is NOT a requirement of a good test. Option A is correct.

Validity, Standardization, and Reliability are commonly considered requirements of a good test.

A)  Heritability refers to the proportion of variability in a trait that can be explained by genetic factors. It is a statistical concept used in the field of genetics and is not a requirement for a good test.

B) Validity refers to the extent to which a test measures what it is intended to measure.

C) Standardization refers to the process of administering a test in a standardized manner to ensure that the results are comparable across different people or groups.

D) Reliability refers to the consistency of the results obtained from a test, i.e., the extent to which a test gives consistent results when repeated under the same conditions.

These three (B, C, and D) are commonly considered requirements of a good test.

Learn more about the requirements of a good test here:

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Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question we have

[tex]density = \frac{2.5}{1.3} \\ = 1.923...[/tex]

We have the final answer as

Hope this helps you

Answer:

Cumulus Congestus & Cumulonimbus Clouds

Answer:

[tex]w = \underline{{ \boxed{400 \: J }}} [/tex]

Explanation:

[tex]work \: done = \boxed{force \times distance} \\ w = 80 \times (4 + 1) = 80 \times 5 \\ w = \underline{{ \boxed{400 \: J }}} [/tex]

Gamma rays are given out by the nucleus of certain radioactive materials. Radioactive material ray causes harm to the human beings and environment.

Gamma decay is the production of extremely high-frequency electromagnetic radiation in order to stabilize the unstable nucleus. You must be well-versed in the various energy levels found in an atom.

The Nucleus has its own amount of energy. Gamma decay is the nucleus' method of transitioning from a higher energy level to a lower energy level by emitting high energy photons.

Gamma rays are given out by the nucleus of certain radioactive materials.

Hence, nucleus is the right answer for the blank.

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[tex] \LARGE{ \underline{\underline{ \purple{ \bf{Required \: answer:}}}}}[/tex]

GiveN:

To FinD:

Step-by-step Explanation:

Using the first Equation of motion,

⇒ v = u + gt

⇒ v = 9.8 + -9.8(1)

⇒ v = 0 m/s

The final velocity is hence 0 m/s.

Answer:

doing her homework/finding time to do important things

Answer:

The final speed is 75 m/s

Explanation:

Constant Acceleration Motion

It's a type of motion in which the velocity of an object changes uniformly in time.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:

[tex]v_f=v_o+at[/tex]

The airplane comes from rest (vo=0) accelerating at a=25 m/s^2 for t=3 s.

The final speed is:

[tex]v_f=0+25~m/s^2\cdot 3~s[/tex]

[tex]v_f=75~m/s[/tex]

The final speed is 75 m/s

Answer:

5 cm

Explanation:

We are given that,

The density of metal = 8 g/cm^3

The Mass of the Solid Cube = Mass of the metal  = 1 kg = 1000 g

We know that,

Density = Mass / Volume

8 = 1000 / V

[tex]V = 1000/8\\V = 125 cm^3[/tex]

Hence, as the volume of the solid cube is 125 cm^3, its side will be the volume's cube root which is 5 cm

Answer:

Mass, m = 816.33kg

Explanation:

Weight can be defined as the force acting on a body or an object as a result of gravity.

Mathematically, [tex] Weight, W = mg[/tex]

Where;

Making mass, m the subject of formula, we have;

[tex] Mass, m = \frac {W}{g} [/tex]

Given the following data;

Weight = 8000N

We know acceleration due to gravity is equal to 9.8 m/s²

Substituting into the equation, we have;

[tex] Mass, m = \frac {8000}{9.8} [/tex]

Mass, m = 816.33kg

Therefore, the mass of the elevator is 816.33kg.

The identification of the correct color of the light with the proper justification would be by student 4: violet, because it has the highest frequency, therefore the correct answer is option D.

It can be understood in terms of the distance between any two similar successive points across any wave for example wavelength can be calculated by measuring the distance between any two successive crests.

As given in the problem, students in a science class were provided with this image and asked to identify which color of light would refract the most if white light was passed through a prism.

Student 4 would correctly identify and justify violet as the appropriate hue of the light since it has the greatest frequency, making option D the right response.

To learn more about wavelength from here, refer to the link;

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Answer:

a) The car travelled a distance of 15 centimeters.

b) The displacement of the car is -15 centimeters.

c) The new position of the car on the track is 65 centimeters.

Explanation:

a) From Mechanical Physics we know that the distance travelled is magnitude of the route covered by the vehicle. If this car travels in a straight line and at constant velocity, then we can calculate the distance traveled by the following expression:

[tex]\Delta s = v\cdot \Delta t[/tex] (Eq. 1)

Where:

[tex]v[/tex] - Speed of the car, measured in centimeters per second.

[tex]\Delta t[/tex] - Time, measured in seconds.

[tex]\Delta s[/tex] - Distance travelled by the car, measured in meters.

If we get that [tex]v = 5\,\frac{cm}{s}[/tex] and [tex]\Delta t = 3\,s[/tex], then the distance travelled by the car is:

[tex]\Delta s = \left(5\,\frac{cm}{s} \right)\cdot (3\,s)[/tex]

[tex]\Delta s = 15\,cm[/tex]

The car travelled a distance of 15 centimeters.

b) The displacement is the vectorial distance between final and initial position. Then, we find that initial and final positions of the car are, respectively:

Initial position:

[tex]s_{o} = 80\,cm[/tex]

Final position: ([tex]s_{o} = 80\,cm[/tex], [tex]\Delta s = 15\,cm[/tex])

[tex]s_{f} = s_{o} -\Delta s[/tex] (Eq. 1)

[tex]s_{f} = 80\,cm-15\,cm[/tex]

[tex]s_{f} = 65\,cm[/tex]

And the displacement of the car is: ([tex]s_{o} = 80\,cm[/tex], [tex]s_{f} = 65\,cm[/tex])

[tex]d = s_{f}-s_{o}[/tex] (Eq. 2)

[tex]d = 65\,cm-80\,cm[/tex]

[tex]d = -15\,cm[/tex]

The displacement of the car is -15 centimeters.

c) The position of the car is its location regarding a point of reference. From point b) we find that the new position of the car on the track is:

[tex]s_{f} = 65\,cm[/tex]

The new position of the car on the track is 65 centimeters.

Answer:

The correct option is;

D. There is not enough information to answer this question

Explanation:

The universal gravitational constant = 6.67408 × 10⁻¹¹ 3³/(kg·s²)

For an in between distance of 1 m and equal masses of 60 kg, we have;

[tex]F = G \times \dfrac{m_{1} \times m_{2}}{r^{2}} = 6.67408 \times 10^{-11} \times \dfrac{60 \times 60}{1^{2}} \approx 2.403 \times 10^{-7} N[/tex]

The gravitational attraction ≈ 2.403 × 10⁻⁷ N, which does not correspond with the answers, therefore, the best option is that there is not enough information to answer this question.

Answer:

Explanation:

The mass of the car can be found by using the formula

[tex]m = \frac{p}{v} \\ [/tex]

p is the momentum

v is the velocity

From the question we have

[tex]m = \frac{60000}{30} = \frac{6000}{3} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

It should be normal force if it's not right plz forgive me.

Explanation:

The force of gravity between the puggle and the puma is  7.7×10⁻¹¹ Newton.

Given parameters:

Mass of the puggle; m =45 kg

Mass of the puma : M = 130 kg.

Distance between them; r = 70 m.

Then,  the magnitude of the force of gravity between the puggle and the puma is; F = GmM/r²

Where, G = universal gravitational constant = 6.6×10⁻¹¹ Si unit.

So, Gravitational force; F = ( 6.6×10⁻¹¹ )×130×45 ÷ (70)² N = 7.7×10⁻¹¹ Newton.

Hence, the magnitude of the force of gravity between the puggle and the puma is  7.7×10⁻¹¹ Newton.

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