d=1/2at^2
solve for a

Answer:

g = -9.8 m/s²

Explanation:

Gravity is the only force pulling on any object in free fall. Gravity near earth's surface pulls with an acceleration g.

The acceleration of the ball is -9.8 meter per sec square acting as deceleration when the ball left the hand after being thrown upwards.  

Explanation:

The ball is thrown with a speed of 14 m/s and the moment it comes into the projectile, gravity starts to work on it. The gravity applies the uniform acceleration of 9.8 m/s^2.

This acceleration is in the form of deceleration [the negative acceleration] is termed as the deceleration. And here, the ball is thrown opposite to the gravity and hence the motion is against the gravity, the acceleration becomes -9.8 m/s^2.

Answer:

Explanation:

when you use mechanical energy you are use kinetic energy and potential energy at the same time.

When pedaling the bike is transforming chemical energy, supplied by the breakdown of the food you eat, into mechanical energy to turn the pedals. The chemical energy is potential and the mechanical energy is kinetic

Answer:

a drought

Explanation:

bullfrogs would only need to store more water if they would go longer periods of time without it - think about how cacti store all the water they can in desert, since there is not a lot of water there.

I believe your answer is Ionic solids.

Melting

Explanation:

This process is called melting in which a solid changes to a liquid

Answer:

Oxygen and an oxyacid.

Explanation:

Water doesn't have much to do with oxidation, and things other than metal oxidize. Through the process of elimination and taking a chemistry class, I can say the answer is most likely B.

Answer:

A. repetition, completing more trials for each solution

Explanation:

In this experiment, the two differ in results that is why they ca not agree on the next step.This happens when experimental results do not confirm the hypothesis of the experiment.In such cases, you are required to assess the stages in the experiment which are- the hypothesis, the experimental stages,the analysis stage and the result stage.The key here is to go through the write up of the experiment to see the problems that cause the variations in results.

In this case where they were testing the freezing points of several solutions, there are four cognitive properties of a solution that affects the solvent. They are lowering of vapor pressure, lowering of freezing point, rise in boiling point or initiation of an osmotic pressure in the process.When they perform more trials for each solution, they will see if they carried out the experiment correctly.

Answer:

A. Repetition, completing more trials for each solution

Explanation:

Just got it right on Edg :)

Answer:

Convert all the times to either hours or seconds

Explanation:

One time unit is in hours, and the other is in seconds.  In order to do the math, the units need to be the same.  So you either need to convert hours to seconds, or seconds to hours.

Answer:

-Convert all the times to either hours or seconds.

Explanation:

Given,

[tex]d= (0.90km) + (12.5km/h) \times (31.5s)[/tex]

While doing a mathematical calculation all the units should be same otherwise the result will not be correct. Here two units of time i.e. second and hour are being used. We will convert the second to hour by dividing it by 3600 as there are 3600 seconds in one hour. The distance will be,

[tex]d= (0.90km) + (12.5km/h) \times (\frac{31.5}{3600}h)[/tex]

[tex]d= 0.90 + 12.5 \times \frac{31.5}{3600}[/tex]

[tex]d= 0.90 + \frac{393.75}{3600}[/tex]

[tex]d= 0.90 + 0.109[/tex]

[tex]d= 1.009 km[/tex]

Answer:

True.

Explanation:

Hypotheses are supposed to be tested, to be proven correct. They usually start from a small thought without 100% correct, but as you do further testing, they become stronger.

Answer: 1)True

Explanation:

A scientific hypothesis is a statement which is based on the the direct observation of a scientific event, process or phenomena. It can be based on the assumptions. It is testified using appropriate scientific methodology.

The scientific hypothesis can be proved to be negative or false but repeated experimental trials can prove a hypothesis true and acceptable.  

When a car brakes to a stop, its kinetic energy is transformed primarily into thermal energy due to friction. The brakes and tires may become warm as a result of this energy conversion. Energy is neither lost nor does it become unobservable potential energy; it simply changes form in accordance with the law of conservation of energy.

When a car brakes to a stop, its kinetic energy is transformed into other forms of energy. This is a fundamental concept in physics related to the conservation of energy, which tells us that energy cannot be created or destroyed, only transformed from one form to another. In the case of a car stopping, the kinetic energy is mostly converted into thermal energy due to the friction between the car's brakes and wheels. This energy transfer can cause the brakes and tires to warm up, and it is why they may feel hot after use. Additionally, some of the energy may be transferred to the surroundings as the car interacts with the air, causing air movement and sound.

The explanation that kinetic energy is transformed into potential energy to be used later is incorrect. Potential energy is related to an object's position in a gravitational field, not its motion. Thus, when the car stops, its kinetic energy does not become potential energy. Similarly, saying that the kinetic energy is still there but not observable is also incorrect, as the kinetic energy has been converted into other forms. The idea that kinetic energy is lost and not conserved is also a misconception because energy conservation is a fundamental law of physics.

Final answer:

When a car brakes to a stop, the kinetic energy is transformed into heat energy through friction.

Explanation:

When a car brakes to a stop, the kinetic energy of the car is transformed into heat energy. The brakes use friction to reduce the car's speed, and as a result, the kinetic energy is converted into heat energy. This can be observed by the warmth of the tires and the fact that the brakes can become very hot after coming to a stop.

We can confirm that the statement made in the question is in fact true, a healthy body weight is associated with a low BMI.

BMI is the acronym for "Body Mass Index". This is a measurement that indicates the fat contents of the body of the individual being measured. A low BMI is associated with healthy body weight as it indicated low levels of fat. Anything below 25% is considered to be acceptable, while anything below 15% is considered to be fit/athletic.

Therefore, we can confirm that this statement is in fact true, as a low BMI indicates low fat levels and therefore is associated with healthy body weight.

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The statement associating a low BMI with a healthy body weight is false. A healthy body weight, as indicated by BMI, falls within the 18-24.9 range. However, BMI is an imperfect measure and can be misleading due to its disregard for muscle mass, fat distribution, and bone density.

The statement that a healthy body weight is associated with a low body mass index (BMI) is False. A healthy body weight, as indicated by BMI, falls within a range. A BMI ranging from 18-24.9 is considered normal weight, 25-29.9 is considered overweight, and a BMI greater than 30 is considered obese. However, BMI has its limitations. It does not account for muscle mass, fat distribution, or bone density, which can lead to inaccuracies in determining actual health status. A muscular person may have a high BMI but low body fat, while an individual with less muscle mass might have a lower BMI but higher body fat percentage.

The object's initial velocity is equal to [tex]-10.59\frac{m}{s}[/tex]

Why?

From the statement we know the height of the tree and the time it takes to reach the ground, so, if we need to calculate its initial velocity, we can use the following formula:

[tex]y=y_o-v_{o}*t-\frac{1}{2}g*t^{2}[/tex]

Where,

y, is the final height (0 meters in this case)

yo, is the initial height (111 meters in this case)

t, is the time elapsed (3.8 seconds in this case)

vo, is the initial speed.

g, is the acceleration due to gravity (-9.81 m/s2)

Now, let's set the origin at the top of the tree, so, rewriting the formula, we have:

[tex]y=y_o+v_{o}*t+\frac{1}{2}g*t^{2}[/tex]

So, isolating the initial velocity, we have:

[tex]y=y_o+v_{o}*t+\frac{1}{2}g*t^{2}[/tex]

[tex]y=y_o+v_{o}*t+\frac{1}{2}g*t^{2}\\\\v_{o}*t=y-y_o-\frac{1}{2}g*t^{2}\\\\v_{o}=\frac{y-y_o-\frac{1}{2}g*t^{2}}{t}[/tex]

Finally, substituting and calculating, we have:

[tex]v_{o}=\frac{-111m-0-\frac{1}{2}(-9.8\frac{m}{s^{2}}) *(3.8s)^{2})}{3.8s}\\\\v_{o}=\frac{-111m-\frac{1}{2}(-9.8\frac{m}{s^{2}})*(14.44s^{2})}{3.8s}\\\\v_{o}=\frac{-111m-\frac{1}{2}(-141.51m)}{3.8s}=\frac{-111m+70.75m}{3.8s}\\\\v_{o}=\frac{-40.25m}{3.8s}=-10.59\frac{m}{s}[/tex]

Hence, we have that the initial velocity of the object is [tex]-10.59\frac{m}{s}[/tex]

Have a nice day!

Answer:

2 m/s²

Explanation:

Acceleration is change in velocity over change in time.

a = Δv / Δt

a = (18 m/s − 10 m/s) / 4 s

a = 2 m/s²

The acceleration of a car going 10 m/s and 4 seconds later it is going 18 m/s is 2m/s².

HOW TO CALCULATE ACCELERATION:

Where;

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Answer:

It is just how your body works, like how your nervous system works. In other words, it is your structure and fuctions of cells in your body of the nervous system.

Hope this helps!

Answer:

a psychiatrist prescribes medication for depression

Explanation:

i just had this question and it was correct

speed = wavelength × frequency

but the frequency was given to as

10khz ,

which means

[tex] {10}^{3} [/tex]

= 1000

so now frequency = 1000hz

substitute it into the equation

speed = 1000×2

speed = 2000ms^-1

The speed of the wave with the frequency of 10 kHz and a wavelength of 2 meters is 20,000 meters per second, or 20 km/s.

To calculate the speed of a wave, we can use this simple physics formula: speed = frequency × wavelength. In this case, the frequency of the wave is 10 kHz (or 10,000 Hz) and wavelength is 2 meters. Knowing these values, we can substitute them into the formula.

Speed = 10,000 Hz × 2 meters

Therefore, the speed of the wave is 20,000 meters per second, or 20 km/s.

The speed of the wave with the frequency of 10 kHz and a wavelength of 2 meters is 20,000 meters per second, or 20 km/s.

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Answer:A.

only when a nonzero net force is applied to the object.

Explanation:

Answer:

he is right its A

Explanation:

t=5s

it was correct on my do-now

so I hope it was useful for you

Answer:

Time, t = 5 seconds          

Explanation:

It is given that,

Initial speed of the bike, u = 8 m/s

Final speed of the bike, v = 14 m/s

Length of the hill, d = 55 m

Firstly, we can find the acceleration of the bike. Let it is equal to a. It can be calculated using third equation of motion as :

[tex]a=\dfrac{v^2-u^2}{2d}[/tex]

[tex]a=\dfrac{(14)^2-(8)^2}{2\times 55}[/tex]  

[tex]a=1.2\ m/s^2[/tex]

Let t is the time passes during the descent. It can be calculated using the first equation of motion as :

[tex]t=\dfrac{v-u}{a}[/tex]

[tex]t=\dfrac{14-8}{1.2}[/tex]      

t = 5 seconds

So, the time passes during the descent is 5 seconds. Hence, this is the required solution.                                                      

Answer:

3 sig figs total mass is 54.32g

Explanation:

It is 3 sig figs because that is the accuracy that Block A was measured to

Answer:

The state of matter that has the most energy is gas.

Explanation:

In a solid, there is limited room for molecules to move around.

Answer:

The greatest amount of particle movement is in gaseous state of matter.

Explanation:

It is known that matter can be classified as solid, liquid and gas states. The molecules in each state exhibit vibrations or movement of particles will be occurring in them. The kinetic energy exhibited by the different states of matter depend upon the bond strength.

If the bond strength is more and if the particles are densely packed like in solids. So the gas state has least bond strength and they are loosely packed molecules and thus the particles can move freely with more kinetic energy.

Answer:

A. pulls back on the Earth, which is the main cause of the rise and fall of the ocean tides on Earth.

The moon’s gravity pulls back on the Earth. Therefore, option (A) is correct.

The Moon's gravity can be described as the acceleration due to gravity on the surface of the Moon. The value of g on the Moon can be calculated by considering the mass of the Moon and earth.

The mass of the Moon is equal to 7.342 x 10²² kg which is 1.2% of the mass of the earth and the radius of the Moon = 1.74 x 10⁶ m

Since the formula to calculate the value of g = GM/r2

The value of the g for the Moon is equal to 1.652 m/s² which is 16.7 % of the gravity of the earth.

The moon's gravity on the Earth is the reason for the rise and fall of ocean tides. The moon's gravitational pull arises two bulges of water on the oceans of the earth in which one where ocean waters face the moon and the pull is strongest and another where ocean waters face away from the moon and the pull is weakest.

Therefore, the gravity of the moon pulling back on the Earth is the correct option.

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Answer:

mass number of 38

Explanation:

Charge is 0 - No. of protons is equal to nom.of electrons, so no charge

Atomic number is 18 - Atomic number is number of protons

Mass number is 38- mass number is number of protons AND neutrons

Answer:

a mass number of 38

Explanation:

X This atom has no a negative charge .

because, number of  protons (18) & electrons (18) are same. so,This atom is neutral.

X This atom has an atomic number of 20.

Because, it has 18 protons. so, This atom has an atomic number of 18.

X  This atom has a positive charge

because, number of  protons (18) & electrons (18) are same.so,This atom is neutral.

Answer:

1.75 s

Explanation:

The vertical position of the rock at time t is given by:

[tex]y(t) = h +ut - \frac{1}{2}gt^2[/tex]

where

h = 15.0 m is the initial height

u = 0 is the initial velocity

g = 9.8 m/s^2 is the acceleration of gravity

t is the time

When the rock reaches the bottom of the cliff,

y(t) = 0

Substituting this condition into the previous equation, we can find the time at which the rock reaches the bottom of the cliff:

[tex]0 = h - \frac{1}{2}gt^2\\t= \sqrt{\frac{2h}{g}}=\sqrt{\frac{2(15.0)}{9.8}}=1.75 s[/tex]

Answer:

A: The frequency of the vibration is 1.3329 Hz

B: The total energy of the vibration is  18.39375 J

Explanation:

The force of the man his weight causes the raft to sink, and that causes the water to put a larger upward force on the raft.  This extra force is a restoring force, because it is in the opposite direction of the force put on the raft by the man.  Then when the man steps off, the restoring force pushes upward on the raft, and thus the raft – water system acts like a spring, with a spring constant found as follows:

k= F/x = ((75 kg) * (9.81 m/s²))/(5*10^-2 m) = 14715 N/m

The frequency of the vibration is determined by the spring constant (k) and the mass of the raft (210kg).

fn = 1/2π * √(k/m)  = 1/2π * √(14715 / 210) = 1.3329 Hz

The frequency of the vibration is 1.3329 Hz

b)

Since the gravitational potential energy can be ignored, the total energy will be :

Etot = 1/2 k* A² = 1/2 * (14715 )*(0.05)² = 18.39375 J

The total energy of the vibration is  18.39375 J

Answer:

Scalar and vector quantities are used by the mathematicians, geographers and engineers to relate and represent the physical variables in terms of magnitude and direction. The quantity which has both magnitude and direction is called as vectors.  Scientists in space station also use them for navigation or when they are launching or exploding a material to define its direction which makes easier for them to navigate. There are many types pf vectors depending upon its property they are used in various applications.

Quantities that determine the kinetic energy of a body are its mass and velocity

Answer:  mass and velocity

Explanation:

The kinetic energy of a body is the energy possessed by an object by virtue of its motion. It is given by the equation

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

Where m represents mass of the body and v represents its velocity.

Two bodies of equal velocity but different mass the heavier body will have greater kinetic energy. When an object is at rest its velocity is equal to zero. Thus its kinetic energy will be zero. Hence it can be concluded that only moving bodies have kinetic energy.

Stationary objects placed at a height possess potential energy which is the energy by virtue of their position or configuration. The total mechanical energy of a system is the sum of potential and kinetic energy.

Answer:

5.48 m/s

Explanation:

We can find the final velocity of the basketball by using the SUVAT equation:

[tex]v^2 - u^2 = 2ad[/tex]

where

v is the final velocity

u = 4.0 m/s is the initial velocity

[tex]a=0.50 m/s^2[/tex] is the acceleration

d = 14 m is the distance covered

Solving the equation for v, we find:

[tex]v=\sqrt{u^2 +2ad}=\sqrt{4.0^2+2(0.50)(14)}=5.48 m/s[/tex]

Answer:

47.9 m

Explanation:

Given:

y₀ = 0 m

t = 6.25/2 = 3.125 s

v = 0 m/s

a = -9.8 m/s²

Find: y

y = y₀ + vt − ½ at²

y = 0 + (0)(3.125) − ½ (-9.8)(3.125)²

y = 47.9 m

We have that for the Question "A baseball is popped straight up into the air and has a hang-time of 6.25 S.

Determine the height to which the ball rises before it reaches its peak. (Hint: the  time to rise to the peak is one-half the total hang-time.)" it can be said that Hence, the height to which the ball rises before it reaches its peak is

S=47.85m

From the question we are told

A baseball is popped straight up into the air and has a hang-time of 6.25 S.

Determine the height to which the ball rises before it reaches its peak. (Hint: the  time to rise to the peak is one-half the total hang-time.)

Generally the Newtons equation for the distance   is mathematically given as

[tex]s=ut+1/2at^2\\\\\ Where \\\\T=\frac{6.25}{2}\\\\T=3.125\\\\[/tex]

Therefore

[tex]s=0+1/2(9.8)(3.125)^2[/tex]

S=47.85m

Hence, the height to which the ball rises before it reaches its peak is

S=47.85m

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Answer:

65 m/s north

Explanation:

The velocity of an object is given by:

[tex]v=\frac{d}{t}[/tex]

where

d is the displacement of the object

t is the time interval needed for the displacement

For the rocket in this problem,

d = 390 m north

t = 6 s

So the velocity is

[tex]v=\frac{390}{6}=65 m/s[/tex] north

It is important to keep in mind that velocity is a vector, so it both has a magnitude (65 m/s) and a direction (which is equivalent to that of the displacement, so in this case north).