Please help! I’ve been doing this for 2 hours I want to be done!

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Explanation:

We'll need the acceleration first.

The acceleration is equal to the change in speed over change in time

a = acceleration

a = (change in speed)/(change in time)

a = (Vf - Vi)/(4 seconds)

a = (0 - 8.0)/4

a = -8/4

a = -2

The acceleration is -2 m/s^2, meaning that Sam slows down by 2 m/s every second. Negative accelerations are often associated with slowing down. The term "deceleration" can be used here.

Here's a further break down of Sam's speeds at the four points of interest

Next, we'll apply Newton's Second Law of motion

F = m*a

where,

We just found the acceleration, and the mass is fairly easy as all we need to do is add Sam's mass with the sled's mass to get 60+5.0 = 65 kg

So the force applied must be:

F = m*a

F = 65*(-2)

F = -130 newtons

This force is negative to indicate it's pushing against the sled's momentum to slow Sam down.

The magnitude of this force is |F| = |-130| = 130 newtons

The wavelength available with the vernier colorimeter which would be the best choice for a beer’s law experiment using strawberry kool-aid should be on of these: 430 nm, 470 nm, 565 nm, and 635 nm.

What is vernier calorimeter?

The Vernier Colorimeter is made to assess the color intensity of a solution to calculate its concentration. Most cuvettes with a 10 millimeter route length can fit in the cuvette slot. The Colorimeter gauges the amount of light passing through a sample at a wavelength that the user chooses.

The wavelength choice among those which are available with the vernier colorimeter and which would be the best choice for a Beer’s law experiment using strawberry cool - aid should be one of the wavelengths mentioned below: 430 nm, 470 nm, 565 nm, and 635 nm. This is because these wavelengths are only suitable to work with vernier calorimeter.

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It should be the first one, F= mXa (F = m times a).

A 40 kg crate is pulled at a constant velocity. The coefficient of kinetic friction is 0.5 and the crate moves 7 m . The amount of work done is 140 joule.

When an object is moved over a distance by an external force, at least a portion of that force must be applied in the direction of the displacement.

By multiplying the length of the path by the component of the force acting along the path, work can be calculated if the force is constant. The work W is equal to the force f times the distance d, or W = fd, to mathematically describe this idea.

The work is W = fd cos if the force is applied at an angle of to the displacement. Performing work on a body involves moving it in its entirety from one location to another as well as.

Therefore, A 40 kg crate is pulled at a constant velocity. The coefficient of kinetic friction is 0.5 and the crate moves 7 m . The amount of work done is 140 joule.

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Answer: this is true

Answer:

it is actually false, the center of gravity is; the unique point where the weighted relative position of the distributed mass sums to zero, thus the center of mass doesn't have to be in the same spot as the center of gravity

Explanation:

Also i took the test and got it right.  

Answer:

Biosphere

Explanation:

Plants release the biosphere into the atmostphere. :)

The work done by the air is 88.06kJ, the change in the air’s internal energy is 357.8J and the type of ideal thermodynamic process is isobaric process.

Given the constant pressure of cylinder (P) = 8.6 x 10^5Pa.

The increase in the cylinder’s volume is (V) = 4.0^5 x 10^-4 m^3.

The energy transferred out of the cylinder as heat (Q) = 9.5J

(a) We know that work done (W) = -PexternalΔV

W = -8.6 x 10^5 x 4.0^5 x 10^-4 = -88.06kJ

Hence the work done is 88.06kJ.

(b) From first law of thermodynamics we know that change in internal energy is equal to heat released - work done.

ΔU = Q - W where W is work and U is internal energy.

ΔU = -9.5 - 348.3 = -357.8J

(c) The type of ideal thermodynamic process this approximates is isobaric process. Under constant pressure, the isobaric process is a thermodynamic process. Even though the pressure is constant in this operation, the temperature, volume, and internal energy are not.

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Answer:

Answer:

t

Explanation:

Answer:

False

Explanation:

The average speed of swimmer is 10 km/hr.

Speed is the rate of change of position of an object in any direction.

Distance is the total movement of an object without any regard to direction.

Given distance of pond is 1 km.

She swims 20 laps , i.e. total distance = 20 * 1 km = 20 km

Time taken to complete = 2 hr

There a relation between speed distance and time which is given by:                      

                         Speed = Distance / Time

                      ⇒Speed = 20/2 = 10 km/hr

So the average speed of swimmer is 10 km/hr.

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The wire connected to the DC source doesn't emit electromagnetic waves.

The electromagnetic wave is an oscillation of electric fields and magnets field that sustains each other, this wave time has the characteristics that it can travel without a material medium, for which they are of extreme importance.

It is caused by DC sources such as batteries only having a constant voltage, it is different from AC sources which have different voltage over time, AC voltage can induce the wire because AC sources have magnetic flux change. DC sources don't have magnetic flux change so they don't emit electromagnetic waves.

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Answer:

this is what i always used

Explanation:

http://www.sjutsscience.com/uploads/3/7/4/5/37458459/phet_collision_lab_2020_key.pdf

The chi-square test assumes that the variables being analyzed are measured at a nominal or ordinal level of measurement.

In statistics, the level of measurement refers to the nature and properties of the data being collected. There are four levels of measurement: nominal, ordinal, interval, and ratio. Nominal and ordinal levels are considered categorical, while interval and ratio levels are considered numerical. The chi-square test is specifically designed for analyzing categorical data, where the observations can be classified into distinct categories or groups. It is used to determine whether there is a significant association or relationship between two categorical variables.

The test calculates the difference between the observed frequencies and the expected frequencies under the assumption of independence between the variables. It compares the observed and expected frequencies using a chi-square statistic and determines the p-value to assess the statistical significance of the association. Therefore, the chi-square test assumes that the variables being analyzed are measured at a nominal or ordinal level because it deals with categorical data and evaluates the relationship between different categories or groups.

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Answer:

Explanation:

The force acting on an object given the mass and acceleration we use the formula

We have

force = 15 × 20

We have the final answer as

Hope this helps you

By Ohm's Law, the voltage across the circuit is D. 12 v.

We need to know about Ohm's Law to solve this problem. Ohm's Law describes the relationship between voltage and current. It can be determined as

V / I = R

where V is voltage, I is current and R is resistance.

From the question above, we know that

I = 0.5 A

R = 24 Ω

By substituting the following parameters, we can calculate the voltage

V / I = R

V = I x R

V = 0.5 x 24

V = 12 volt

Hence, the voltage is 12 volts.

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Answer:

thats a lot, which one u want me to do?

Explanation:

To find the total coulombs delivered, you can use the formula: charge (in coulombs) = current (in amps) × time (in seconds). In this case, the current is 39 amps and the time is 786 seconds.

Plugging these values into the formula, we have:

charge = 39 amps × 786 seconds

Now, multiply the current (39 amps) by the time (786 seconds):

charge = 30554 coulombs

Therefore, 39 amps of current running for 786 seconds delivers a total of 30554 coulombs.

When 1.39 amps of current flows for 786 seconds, a total of 1091.54 coulombs is delivered. Coulombs are a unit of electric charge, and their value is obtained by multiplying the current in amperes by the time in seconds. In this case, the calculation is straightforward:

1.39 A x 786 s = 1091.54 C. This indicates the total amount of charge transferred during the given duration.

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The total resistance of the circuit, given that parallel circuit has two resistors at 15 and 40 ohms is 11 ohms.

From the question given, the follow data were obtained:

The total resistance in the circuit can be obtained as follow:

R = (R₁ × R₂) / (R₁ + R₂) => Parallel arrangement

= (15 × 40) / (15 + 40)

= 600 / 55

= 11 ohms

Thus, we can conclude that the total resistance 11 ohms. None of the options are correct.

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Considering the definition of pressure, force will have the same units of pressure is multiplied by area.

Pressure is defined as the force exerted per unit area.

In this way, for the same force, the pressure is inversely proportional to the surface: this means that, for the same force, the smaller the surface, the greater the pressure exerted and the more the body will be deformed.

That is, pressure is defined as the force exerted perpendicularly on a surface and is expressed mathematically as:

\(Pressure=\frac{Force}{Area}\)

In the International System of Units, the unit of pressure is the pascal (Pa). One pascal is the pressure exerted by a force of 1 N distributed over an area of ​​1 m².

Then, the definition of force can be expressed as:

Force= Pressure× Area

In summary, force will have the same units of pressure is multiplied by area.

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The magnet is moving down with the north pole downward, and during the transition, there will be an increase in magnetic flux through the ring, which will produce the induced current through the ring.

When the bar is moved toward loop the flux will increase and the induced current will counter this flux.

The induced current tries to oppose the change in magnetic flux and this is possible just if the current direction is counterclockwise.

Result: The current direction is counterclockwise

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Explanation:

Hydraulic systems use the pump to push hydraulic fluid through the system to create fluid power. The fluid passes through the valves and flows to the cylinder where the hydraulic energy converts back into mechanical energy. The valves help to direct the flow of the liquid and relieve pressure when needed

Answer:

about 4 km

Explanation:

15 minutes is a quarter of an hour, so you divide 16km by 4 to get your answer

The electric field strength at a distance of 1.20 m on the x-axis is -1.5 × 10⁴ N/C.

To find the electric field strength at a distance 1.20 m on the x-axis, we can use Coulomb's law:

\($$F=k\frac{q_1q_2}{r^2}$$\)

where F is the force between two charges, q1 and q2 are the magnitudes of the charges, r is the distance between the charges, and k is the Coulomb constant.For a single point charge q located at the origin of the x-axis, the electric field E at a distance r is given by:

\($$E=\frac{kq}{r^2}$$\)  where k is the Coulomb constant.

So, let's calculate the electric field due to each charge separately and then add them up:

For the +2.0 C charge at x = 0, the electric field at a distance of 1.20 m is:\($$E_1=\frac{kq_1}{r^2}=\frac{(9\times10^9)(2.0)}{(1.2)^2}N/C$$\)

For the -3.0 C charge at x = 0.40 m, the electric field at a distance of 1.20 m is:

\($$E_2=\frac{kq_2}{r^2}\)

\(=\frac{(9\times10^9)(-3.0)}{(1.20-0.40)^2}N/C$$\)

The negative sign indicates that the direction of the electric field is opposite to that of the positive charge at x = 0.

To find the net electric field, we add the two electric fields\(:$$E_{net}=E_1+E_2$$\)

Substituting the values of E1 and E2:

\($$E_{net}=\frac{(9\times10^9)(2.0)}{(1.2)^2}-\frac{(9\times10^9)(3.0)}{(0.8)^2}N/C$$E\)

net comes out to be -1.5×10⁴ N/C.

Therefore, the electric field strength at a distance of 1.20 m on the x-axis is -1.5 × 10⁴ N/C.

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1. The observed X-rays in the context of black holes do not originate from inside the black hole itself. Instead, they are generated from the immediate vicinity of the black hole where intense gravitational forces and extreme physical conditions occur.

2. The effect of interstellar dust on the observed brightness of distant objects confused. scientists for several decades, causing them to overestimate distances. Some of the commonly used distance indicators are:

Some common sources of error are:

A black hole is an area of space where gravity is so intense that nothing can escape it, not even light. When a big star experiences gravitational collapse, a very dense and compact object is created. When a star runs out of nuclear fuel, it collapses due to gravity since it is no longer able to withstand the pull of gravity.

An accretion disc grows around a black hole as matter enters it. The gravitational energy released as matter spirals towards the black hole causes the spinning disc of gas, dust, and other star material that makes up the accretion disc to become incredibly bright and luminous. The matter in the accretion disc collides, heats up, and emits high-energy radiation, including X-rays, as a result of the black hole's strong gravitational pull.

Therefore, the observed X-rays in the context of black holes do not originate from inside the black hole itself. Instead, they are generated from the immediate vicinity of the black hole where intense gravitational forces and extreme physical conditions occur.

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Answer: 228 meters

Explanation: D=vIxt+1/2At^2

Answer:

Acceleration of one cyclist=\(2.67m/s^2\)

Yes, the acceleration is higher of another cyclist who accelerates from 0 to 30 m/s in 8 seconds.

Explanation:

We are given that

Initial velocity of one cyclist, u=0 m/s

Final velocity of one cyclist, v=8m/s

Time, t=3 s

Initial velocity of another cyclist, u'=0

Final velocity of another cyclist, v'=30m/s

Time, t'=8 s

We know that

Acceleration, \(a=\frac{v-u}{t}\)

Using the formula

\(a=\frac{8-0}{3}=\frac{8}{3}=2.67m/s^2\)

Acceleration of one cyclist=\(2.67m/s^2\)

Acceleration of another cyclist, a'=\(\frac{30-0}{8}m/s^2\)

Acceleration of another cyclist, a'=\(3.75m/s^2\)

Yes, the acceleration of another cyclist is higher than the cyclist which accelerates from 0m/s to 8m/s.

The long hand that is on the clock is minute hand and it Changes by seconds hand