Which sentence best describes the runner whose velocity-time graph is shown?

When a paper is crumpled and then released the air drag on the paper is less while when we put the flat paper and released it from rest we can see that there is large surface area due to which it will have more air drag and hence it will reach later

So we can say that air friction or air drag depends on the surface area of object

More will be the surface area more is the drag force of air and hence less is the effective acceleration due to gravity

So when we drop the two objects in vacuum it will not have any friction force

and hence they both will have same gravity downwards

So in that case the two objects will reach the ground in same time

so its answer will be

Both papers will reach the ground at the same time.

Answer:

the answer is they both hit at the same time

Explanation:

In order to calculate the voltage difference in the circuit, we need to look at the equation: V=IR.

In the equation:

V= Voltage

I= Current

R= Resistance.

Assuming we know this, We will plug it into an equation to find our voltage.

V=(.50a)x(24Ω)

If we solve for V, Your final answer will be: 12v (or 12 volts)

The voltage difference in a circuit that has the given resistance and current is 12 Volts.

Given the data in the question;

We know that; current is the ratio of potential difference and resistance.

It is expressed as:

[tex]I = \frac{V}{R}[/tex]

We substitute our given values into the equation and solve for the voltage

[tex]0.50A = \frac{V}{24ohms}\\\\V = 0.50A \ *\ 24ohms\\\\V = 12Volts[/tex]

Therefore,  the voltage difference in a circuit that has the given resistance and current is 12 Volts.

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speed of the car at t = 10 s is given as 10 m/s

now at t = 30 s car comes to rest so v = 0

now in this velocity time graph we can say slope will show the acceleration of the car as we know that acceleration is rate of change in velocity

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

as we know that

[tex]v_f = 0[/tex]

[tex]v_i = 10 m/s[/tex]

[tex]\Delta t = (30 - 10) = 20 s[/tex]

now from above formula

[tex]a = \frac{0 - 10}{20} = -0.5 m/s^2[/tex]

So slope of the graph will represent the acceleration of car which is 0.5 m/s^2

Actually the correct answer is going to be Linear, sloping downward.

Please mark Brainliest if this answer helped you.

Now the vertical velocity of the ball thrown at an angle 10° is given as

Voy(initial vertical velocity)= 30m/s x sin 10

Voy(initial vertical velocity)= 5.2m/s

Now the ball is decelerating with an acceleration due to gravity equivalent to 9.8m/s^2.

Let Vy be the final velocity and that is equal to zero in this case.

Now

Vy= Voy- tx9.8

Where t is the time at which the vertical velocity becomes 0.

Substituting the values we get

0= 5.2-tx9.8

9.8t=5.2

t=0.53 secs

Answer:

at the top of the ball’s trajectory

Explanation:

The answer to this would be plastic. The other options are conductors. Remember, metal is a conductor as well as the salt ions in salt water.

sound travels through air, not through vacuum = lack of air

A bell can be heard inside a sealed bell jar full of air because sound waves travel through the air, causing vibrations that reach the ear and are interpreted as sound.

The reason a bell can be heard when rung inside a sealed bell jar full of air is due to the ability of sound waves to travel through gases, like air. Sound waves are mechanical waves requiring a medium to propagate, and in the presence of air inside a bell jar, these waves can move by causing the air molecules to vibrate. This sets off a chain reaction of vibrating molecules that eventually reach your ear, translating into the sound you hear. In contrast, if the jar were to be evacuated, leaving a vacuum, there would be no medium for the sound waves to travel through, and the bell wouldn't be heard.

Can u tell me the answer choices? Than I will help.

Answer: Bernoulli’s

Explanation:

Horizontal distance covered is given as

[tex]x = 22 m[/tex]

vertical distance climbed by is given as

[tex]y = 4.8 m[/tex]

now we need top find the angle made by the displacement vector with respect to horizontal

So here we will say that we can use trigonometry to find out the angle with horizontal

The formula is given as

[tex]tan\theta = \frac{opposite \: side}{adjacent \: side}[/tex]

here given that

opposite side = 4.8 m

adjacent side = 22 m

now we can plug in all data in above equation

[tex]tan\theta = \frac{4.8}{22}[/tex]

[tex]tan\theta = 0.22[/tex]

[tex]\theta = tan^{-1}0.22[/tex]

[tex]\theta = 12.3 degree[/tex]

so here the displacement will make 12.3 degree angle with horizontal

When you run in gym class and then climb a rope, the direction angle of your total displacement as measured from the horizontal can be calculated using the inverse tangent function. Given a horizontal displacement of 22m and a vertical displacement of 4.8m, the direction angle is approximately 12.42 degrees.

The direction angle of displacement denoted by Θ in this context, is calculated based on the horizontal and vertical components of your displacement. Since displacement in this scenario forms a right triangle with the horizontal displacement (22m) and vertical displacement (4.8m), we can calculate the angle using the inverse tangent function (also known as arctan or tan^-1).

So, Θ = arctan(vertical displacement/horizontal displacement) = arctan(4.8m / 22m) = 12.42 degrees.

The direction angle of your total displacement, as measured from the horizontal in this context is approximately 12.42 degrees.

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The correct answer is:

B. 2Na + Cl2 --> 2NaCl

In fact, this is the only reaction among the choices where the number of atoms of each element is conserved. In fact, we see that on the left we have 2 atoms of sodium and 2 atoms of chlorine, and on the right we have two molecules of NaCl, which means that we still have 2 atoms of sodium (Na) and 2 atoms of chlorine (Cl).

Answer:

The object's final velocity is approximately \(17.15 \ m/s\) downward.

Solution is given in following attachment.

26 m/s - 20 m/s = 6 m/s

Friction in this case will act counter to the direction of the box's movement. The box moves left to right, so the force of friction acts in the opposite direction. (D)

Answer: Hello there!

first, we have two notions of the force of friction:

The force of friction is in the opposite direction of the motion direction.

It acts in the contact point between the objects.

Then if the box is moving from left to right, the friction force should point from right to left, and be in the bottom of the box (the contact point between the box and the floor).

The diagram that shows this is the D.

Sample A: Iodine

Sample B: Bromine

Sample C: Chlorine.

The answer is:

All the above

The explanation:

The volume and the temperature and the number of particles will affect the pressure of an enclosed gas.

because according to boyle's law when the temperature constant so the pressure and volume of a gas have an inverse relationship, when temperature is constant.

when:

PV = nRT

when p is the pressure

V is the volume

n is number of moles

T is temperature

from this law we can know that there is a relation  between P and V and when n has a relation with the number of particles so:

volume , temperature and number of particles affect the pressure of an enclosed gas.

Final answer:

The pressure of an enclosed gas can be affected by the volume of the container, the temperature of the gas, and the amount of gas within the container.

Explanation:

The pressure of an enclosed gas is affected by various factors including volume, temperature, and the amount of gas. When the volume of a gas container is decreased, there is less space for the gas molecules to move around, resulting in more frequent collisions with the container walls and an increase in pressure. This relationship is an example of Boyle's law. Conversely, increasing the volume will decrease the pressure. Additionally, raising the temperature of the gas increases the kinetic energy of the molecules, leading to more frequent and forceful collisions with the walls, thus increasing the pressure. Lastly, adding more gas molecules to the container, while keeping the volume and temperature constant, will also increase the pressure because there are more molecules to collide with the container walls per unit time.

Transformer is used to change the voltage from higher value to lower value

It is done by changing the number of coils in primary and secondary coils

The working equation is given as

[tex]\frac{V_s}{V_p} = \frac{N_s}{N_p}[/tex]

here we have

[tex]V_s[/tex] = Secondary coil voltage = 120 V

[tex]V_p[/tex] = Primary coil voltage = 240,000 V

[tex]N_s[/tex] = Turns in secondary coil

[tex]N_p[/tex] = Turns in primary coil

Now by using the equation above

[tex]\frac{120}{240,000} = \frac{N_s}{N_p}[/tex]

now we have

[tex]\frac{N_p}{N_s} = \frac{240,000}{120}[/tex]

[tex]\frac{N_p}{N_s} = 2000[/tex]

so the ratio must be 2000

2000:1 is the ratio of the number of turns in the primary coil to the secondary coil of a transformer that steps down the voltage from 240,000 V to 120 V.

The ratio of the number of turns in the primary coil ([tex]n_p[/tex]) to the secondary coil ([tex]n_s[/tex]) of a transformer is directly related to the input ([tex]V_p[/tex]) and output voltage ([tex]V_s[/tex]).

The formula to calculate this ratio is:

[tex](V_p / V_s) = (n_p / n_s)[/tex]

Given:

Using the formula:

[tex](240,000 V / 120 V) = (n_p / n_s)[/tex]

This simplifies to:

[tex]2000 = (n_p / n_s)[/tex]

Therefore, the ratio of the number of turns in the primary coil to the secondary coil is 2000:1.

solution is written in attached image.

To find the acceleration of the blocks and the tension in the cable, we can use Newton's second law of motion and set up equations for the hanging mass and the block on the surface. Solving these equations will give us the values we need.

In order to find the acceleration of the blocks and the tension in the cable, we can use Newton's second law of motion which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration.

In this system, the force of gravity acting on the hanging mass mg pulls it downward, while the tension in the cable T pulls it upward. Since the system is frictionless, the acceleration of both blocks will be the same and can be represented as a.

Applying Newton's second law to each block, we can set up the following equations:

For the hanging mass: mg - T = ma

For the block on the surface: T = mR

where m is the mass of the hanging block, g is the acceleration due to gravity, a is the acceleration of the system, and R is the mass of the block on the surface.

Solving these equations simultaneously will give us the value of the acceleration and the tension in the cable.

velocity is of sound id defined as distance covered by sound per unit time

here given that

distance covered by sound = 3.5 m

time taken by the sound = 0.919 millisecond

So the velocity of sound will be given as

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

[tex]v = \frac{3.5}{0.919* 10^{-3}}[/tex]

[tex]v = 3808.5 m/s[/tex]

so the speed of sound in the given medium is 3808.5 m/s

As we know that speed of sound in any substance is given as

[tex]v = \sqrt{\frac{E}{\rho}}[/tex]

As per the data available online the speed of sound in gold is 3250 m/s while speed of sound in glass is 4500 m/s

So here we can say the above speed is in between these two mediums whose elasticity and density ratio is more than gold but less than glass.

So this velocity of sound is nearly match with the data obtained for copper

So this speed is approx obtained in copper

Answer: Option A

Explanation: In an elastic collision, the two objects only will have the same velocity after the collision if the had it before.

Now, in an inelastic collision the kinetic energy is not conserved, so there is a chance that the two objects that started with a different velocity end with the same, and that case is called "Perfectly inelastic" it occurs when the maximum kinetic energy is absorbed, and both objects "stick" to each other and move together as one, so the correct option is option A.

Lol I just did this on USA Test Prep. The answer is D.

Option D - The liquid state is stabilized by the molecule's intermolecular forces resulting in a high enthalpy of vaporization → is the correct option.

We have enthalpy of vaporization.

We have to determine how is the enthalpy of vaporization related to intermolecular forces during a phase change.

Intramolecular forces are the forces that hold atoms together within a molecule.

According to the question -

The molecules inside liquid are held together by the intermolecular forces. A specific amount of heat energy is required to overcome these intermolecular forces in order to change the state from liquid to gas. This energy is called heat of vaporization. Hence, the intermolecular forces help liquid to stay in a steady state which will ultimately require more energy to separate the molecules.

Therefore, Option D is the correct Alternative.

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They grew up  to that sound. They love the sound of that same traffic sound.

We know that either team is winning which means that the cumulative forces (sum of each girl force) on both teams are equal.

This means,

[tex]250 + 250 + 250 + 250 = 260 + 260 + 260 + x[/tex]

being x the force of the fourth girl on the east team.

Solving to x, you get

[tex]x = (250 + 250 + 250 + 250) - (260+260+260)

x = 1000 - 780

x = 220[/tex]

The fourth girl on the east is pulling with a force of 220N.

The force applied by fourth girl in east team is 220 N.

If neither side is wining, it means that force applied on both sides are equal.

Total force by team west = 250 N * 4 = 1000 N

Total force of 3 girls on east side = 260 N * 3 = 780 N

As we know the east team apply total force of 1000 N.

Force applied by the fourth girl in east team = 1000 N - 780 N = 220 N

The answer is Newton's First law of motion.

Answer:

Newton's First law of motion.

Explanation:

Newton's First law of motion -

Newton' s first law of motion , also called the law of inertia .

According to this law , when an object is at rest or at stationary position , stays at that position and when the object is at motion , continues to be at the motion unless and until some force is acted on it .

Hence , the correct law for the given statement of the question , is Newton's First law of motion .

The bunch of stuff in the jar is a mixture. The different kinds of pieces aren't bound to each other, and they can be easily separated.

Average speed is defined as the ratio of total distance covered in total given time

[tex]speed = \frac{distance}{time}[/tex]

here we know that total distance that man moved is

[tex]d_1 = 200 km[/tex]

[tex]d_2 = 100 km[/tex]

so total distance is

[tex]d = d_1 + d_2[/tex]

[tex]d = 200 km + 100 km[/tex]

[tex]d = 300 km[/tex]

now here total time of the motion is

[tex]t_1 = 6 hours[/tex]

[tex]t_2 = 4 hours[/tex]

total time will be given as

[tex]t = t_1 + t_2 [/tex]

[tex]t = 6 + 4 = 10 hours[/tex]

now by above formula

[tex]v_{avg} = \frac{300}{10}[/tex]

[tex]v_{avg} = 30 km/h[/tex]

so his average speed is 30 km/h

here rocket starts from rest

It turns the booster and continue with constant acceleration

[tex]a = 4 m/s^2[/tex]

now in order to find the final velocity we can use kinematics equation

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

here we know that

[tex]v_i = 0[/tex]

t = 3 s

now plug in all data in above equation

[tex]v_f = 0 + 4*3[/tex]

[tex]v_f = 12 m/s[/tex]

so the rocket will move rightwards with speed 12 m/s after 3 s of boosters