A construction worker drops a brick off a high scaffold. If the brick lands 5.0 s later, how fast was the brick travelling the instant before hitting the ground?

The stopping distance is 8.33.

Let's use the equation s = v0t + 1/2at^2 to solve for the stopping distance.

s = 8.33t + 0.5(0)(t^2)

s = 8.33t

Since the acceleration is 0, the stopping distance is equal to the total distance the car traveled while its velocity was 8.33.

What is distance?

Distance is the amount of space between two points. It can be measured in various units such as miles, kilometers, feet, and meters. Distance can also be used to describe the length of time or amount of effort it takes to reach a certain point. Distance can be used in reference to physical space or to abstract concepts.

Therefore, The stopping distance is 8.33.

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Answer:

t = 1.659s

Explanation:

We can use the kinematics equations to solve this questions:

v = u + at

\(v^{2} = u^{2} +2as\)

where v = Final Velocity, u = initial velocity, a = acceleration, t = time, s = displacement

a) Given information from the question,

u = \(\frac{70km}{h} =\frac{(70*1000)m}{(1*3600)s} = 19.444m/s\) (Convert km/h to m/s first)

a = \(2m/s^{2}\)

s = 35m

Now we can substitute these values into the 2nd kinematics equation to find v, final velocity.

\(v^{2} =(19.444)^{2} +2(2)(35)\\v=\sqrt{(19.444)^{2} +2(2)(35)} \\v= 22.761m/s (5.sf)\\\)

b) Now we have the final velocity, we can substitute the values into the first kinematics equation to find t , the time taken.

v = u + at

22.761 = 19.444 + 2t

2t = 22.761 - 19.444

t =\(\frac{22.761-19.444}{2}\)

t = 1.659s

The data set that is most likely from the car equipped with ABS is :

Although the plots related to your question is missing attached below is the missing data.  

The First plot ( acceleration vs time ) plot is the data that represents the application of brakes in a car fitted with ABS ( antilock braking system ) because of the absence of skidding effect between 6.5 and 9 seconds in the graph.

The skidding effect is present in the second plot around the same time because the car is not fitted with ABS  

Hence we can conclude that the graph that shows the car fitted with ABS is the first plot .

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The man moves across the ice with a velocity of -1 m/s.

Formula:

To calculate the velocity we would be using the formula,

M₁U₁ + M₂U₂ = M₁V₁+ M₂V₂

Given:

After applying the law of linear momentum, we get the following value before the throw;

M₁ = Man's initial mass= 80kg,

U₁ = Initial velocity of Man = 0,

M₂= Initial mass of Book  = 4kg,

U₂= Initial velocity of Book = 0.

After the throw, the book's velocity will be

M₁ = Man final mass = 80kg,

V₁ = Man's final velocity = V.

M₂ = Final mass of Book = 4kg,

V₂ = Final velocity of Book = 20 m/s

After substituting the values in the formula, we get,

M₁U₁ + M₂U₂ = M₁V₁+ M₂V₂

Or, (80 x 0) + (4 x 0) = (80V) + (4 x 20)

Or, 0 = 80V + 80

Or, 80V = -80

Or, V = -80/80

V= -1m/s

[Note: The -ve sign shows the opposite direction]

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pushed to the right = 300 newtons

pushed to the left = 400 newtons

\(400-300=100\)

\(\fbox{100 Newtons to the left}\)

To calculate the force constant (k) required to produce a specific period for a mass-spring system, we can use the formula for the period of a mass-spring oscillator:

T = 2π√(m/k)

Where:

T = Period of oscillation

m = Mass attached to the spring

k = Force constant (also known as spring constant)

Given:

Period (T) = 0.45 s

Mass (m) = 0.016 kg

Rearranging the formula, we can solve for the force constant (k):

k = (4π²m) / T²

Substituting the given values into the formula:

k = (4π² * 0.016) / (0.45)²

k = (4 * 3.1416² * 0.016) / (0.45)²

k ≈ 56.59 N/m

Therefore, the force constant required to produce a period of 0.45 s for a 0.016-kg mass on the spring is approximately 56.59 N/m.

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The main answer is that the temperature of boiling water is generally 100°C.

Your measurement may or may not agree with this standard boiling temperature.
The explanation for any discrepancy could be due to factors such as atmospheric pressure, altitude, or the purity of the water.

At higher altitudes or lower atmospheric pressure, water boils at a lower temperature, while impurities can slightly alter the boiling point as well.

In summary, the standard boiling temperature of water is 100°C, but measurements can vary depending on various factors.

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Answer:

Option a

Explanation:

The light that strikes this surface is referred to as the incident ray, and the light reflected is referred to as the reflected ray - as one might have guessed. Respectively, the angle with which the incident ray struck the surface is known as the " incident angle, " while the angle with which the reflected ray reflects off this surface is known as the " angle of reflection. "

_______________________________________________________

By the law of reflection, you would say that the incident angle is equal to the angle of reflection. Thus, the answer is option a.

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The mass of the car, according to the inquiry, is 897.6 kg.

Mass is the measure of the amount of matter in an object. It is measured in kilograms (kg) in the International System of Units (SI), or in pounds (lb) or ounces (oz) in the imperial and US customary systems. Mass can also be measured using density, which is the ratio of mass to volume.

The kinetic and potential energies of the car can be added to get its total mechanical energy, which is 920,500 J. We know the height of the slope (1.2 m), the speed of the car (18 m/s), and that it is flying over the hill.

K = 0.5 x m x (18 m/s)²

U = m x 9.8 m/s² x 1.2 m

0.5 x m x (18 m/s)² = 920,500 J

m x 9.8 m/s² x 1.2 m = 920,500 J

Solving these two equations, we get m = 897.6 kg.

Therefore, the mass of the car is 897.6 kg.

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Answer:

Imma just add it since i got it right. Well its the first one.

Explanation:

Mine is A temporary magnet is only able to create its own magnetic field while in the presence of a stronger magnet. In other words, these types of magnets need assistance from a larger force in order to be able to attract other objects and magnets.

Answer:

Any time

Explanation:

Answer:

Because white color reflects back the heat coming from the sun while dull colors absorb the heat.

Answer:

it References the position

Explanation:

Displacement is defined to be the change in position of an object.

And the treasure can't move by itself because its an object (and objects don't move).

Answer:

he can use the laser to point to specific information on the slides.

he can use the laser to point to specific information on the slides.Explanation:

He can use the laser to point to specific information on the slides might a laser best help him with the presentation. Hence, option B is correct.

When something is referenced in the text, "specific information" refers to an explicit, precise fact or description of that item. Generally speaking, general information is nebulous and serves as a wide description of something.

A particular instance is a particular example. In order to present a specific example of technology, one could write about specific individuals using a specific machine. You would need to write about specific individuals in order to provide a concrete example of any human activity.

There are various specific issues that need to be resolved. To address particular challenges, specific groups may be formed. I prompted him to provide further details. She is from the United States, namely Boston.

Thus, option B is correct.

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Sir isaac Newton made a connection between the mass of an object and the distance between them.

According to Newton's law of universal gravitation, every object in the universe attracts each other with a force directly proportional to the product of the masses of the object and inversely proportional to the distance between the two objects.

\(F = \frac{Gm_1m_2}{R^2}\)

where;

Thus, we can conclude that Sir isaac Newton made a connection between the mass of an object and the distance between them.

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Answer:

I don't understand

Explanation:

Gas particles can change to solid particles if the temperature decreases.

The state of matter of a substance is determined by its temperature and pressure. When the temperature of a gas decreases, its particles lose kinetic energy and slow down. This decrease in kinetic energy leads to a decrease in the average speed of gas particles.

As the temperature continues to decrease, the particles lose energy and move closer together. At a certain temperature known as the condensation point or the freezing point, the gas particles no longer have enough energy to overcome the intermolecular forces holding them together.

At this point, the gas undergoes a phase transition and changes into a solid. The process of gas turning into a solid is called condensation or freezing, depending on the specific substance.

During condensation, the gas particles arrange themselves in a more orderly and structured manner, forming a solid. The transition from gas to solid involves the release of energy, known as heat of fusion.

In summary, when the temperature of a gas decreases below its condensation or freezing point, the gas particles lose energy, slow down, and eventually come together to form a solid.

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5.16883548 m is the wavelength, if E.M radiation has a frequency of 58,000,000 Hz.

Given data :

Formula:

        λ = C/f

Where,

λ (Lambda) = Wavelength in meters

c = Speed of Light (299,792,458 m/s)

f = Frequency

λ  = 58,000,000 / 299,792,458 = 5.16883548

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Answer:

Explanation:

If dropped from a position of rest, the object will be traveling 9.8 m/s (approximately 10 m/s) at the end of the first second, 19.6 m/s (approximately 20 m/s) at the end of the second second, 29.4 m/s (approximately 30 m/s) at the end of the third second

In order to get a stone slab to move, one would have to apply force to it. This can be done in a number of ways, depending on the situation. Here are a few possible laws that could be proposed for moving a stone slab:1. Newton's first law of motion: This law states that an object at rest will stay at rest unless acted upon by an external force. Therefore, to move a stone slab, one would need to apply a force to it.

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Answer:

So first determine how many times does 5 go into 100.

100/5=20

Thus in 100 seconds the boy would have traveled a distance of 10 meters 20 times.

10*20=200

If the boy travels 10meters in 5 seconds, he travels 200m in 100seconds.

Here, we know that the the total distance is 10m and the total time is 5s . so the avg. speed is 10m5s=2m/s .

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The vibrational period of the rope, when a student shakes it is 0.25 s.

Frequency is the number of oscillations per second.

Given is the number of vibrations =36 in time t = 9s, then frequency will be

f = 36/9 =4Hz

The time period is the reciprocal of the frequency.

T = 1/f

Plug the frequency value, we get

T = 1/4 Hz = 0.25 seconds

Thus, the vibrational time period is 0.25s.

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\( \sf• \: Battery \: Voltage \: (V) = 9 \: v\)

\( \sf• \: Current \: (I) = 18 \: Amps.\)

\( \\ \)

\( \sf• \: The \: Resistance. \)

\( \\ \)

\( \huge\bf{ \underline{Solution :- }}\)

\( \bf \red{ \bigstar{ \: Formula \: of \: Resistance \: (R) = \frac{V}{I}}}\)

\( \rightarrow \sf R = \frac{9}{18} \)

\( \rightarrow \sf R = \frac{1}{2}\)

\( \rightarrow \sf R = 0.5\)

\( \\ \)

Answer:

O a force that opposes motion

The value of the capacitance reactance being used when the power factor given is 0.95 is 3.0424349222966542 ohms.

The power factor is a measure of how efficiently electrical power is being used.

A power factor of 1 means that all of the electrical power is being used for useful work, while a power factor of less than 1 means that some of the electrical power is being wasted.

A capacitor can be used to improve the power factor of an AC circuit by providing a reactive load that cancels out the inductive load of the circuit. The value of the capacitance reactance needed to improve the power factor to 0.95 can be calculated using the following formula:

XC = 1 / tan(acos(PF))

where PF is the power factor.

In this case, the power factor is 0.95, so the capacitance reactance is:

XC = 1 / tan(acos(0.95)) = 3.0424349222966542 ohms

The value of the capacitance reactance being used when the power factor given is 0.95 is 3.0424349222966542 ohms. This can be calculated using the formula given above.

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Answer:

J = 500 kg-m/s

Explanation:

Given that,

Initial speed of the motor, u = 5 m/s

Final speed of the motor, v = 7 m/s

Mass of the boat, m = 250 kg

We need to find the impulse applied by the motor. We know that impulse is equal to the change in momentum. It is represented by letter J.

J = m(v-u)

J = 250 (7-5)

J = 500 kg-m/s

Hence, the impulse applied by the motor is 500 kg-m/s.

Using Newton’s laws of motion, we have

H= (1/2)gt^2. Using H= 1m

1= (1/2) x 9.8 x t^2

Hence, t= square root of 10/49 = 0.45 seconds (approx.)

Now, also velocity with which it hits the ground,

V= square root of 2gh= square root of 2 x 9.8 x 1= 4.4 m/s (approx.)

The second solution will be

The equation for a falling object is h(t)=gt²/2 +vt+c. In this case, h(t)=0, v=0, and c=1.

So:

step-1:

                        0=-4.9t²+1

                         4.9t²=1

                          t²=1/4.9

                          t=0.4518s (second)

It is velocity at this time is gt, or -9.8 m/s² * 0.4518s=4.43 m/s

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A) The paleoclimatic indicators deposited along the Cretaceous epeiric seaway are A) Kaolinite and Calcrete.

B) The time period in the late Paleozoic that has the most tillite, indicating a cool, temperate climate, is A) Late Permian.

C) The correct ranking of sea level depth from highest to lowest, from the Cretaceous to the Pleistocene, is B) Eocene, Miocene, Pleistocene, Cretaceous.

D) During the Late Permian and early Triassic, the climate was mostly A) Tropical.

A) Kaolinite and Calcrete are indicators of a paleoclimatic environment in the Cretaceous epeiric seaway, suggesting arid or semi-arid conditions.

B) The presence of tillite indicates glacial activity and a cool, temperate climate. The Late Permian period had the most tillite, suggesting a cool climate during that time.

C) The correct ranking of sea level depth from highest to lowest, from the Cretaceous to the Pleistocene, is as follows: Eocene (highest), Miocene, Pleistocene, Cretaceous (lowest). This ranking is based on geological evidence and sea level fluctuations throughout Earth's history.

D) During the Late Permian and early Triassic, the climate was predominantly tropical. Fossil records and paleoclimatic indicators from that time indicate warm and humid conditions, with evidence of lush vegetation and diverse reptilian life adapted to tropical environments. The climate shifted from the cool, temperate conditions of the Paleozoic era to a more tropical climate in the early Mesozoic era.

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Answer:

B. The refridgerant

Explanation:

this allows the refrigerant to absorb or release heat

Answer:

The magnetic field is doubled.

Explanation:

What happens to the strength of the magnetic field if one more 1.5 v dry cell is added?

The magnetic field due to a current carrying conductor is directly proportional to the current flowing in the wire.

If we connect one more battery of 1.5 V so the voltage is doubled and according to the Ohm's law, as the resistance of wire is constant, so the current in the wire is also doubled.

When the current doubles, the magnetic field produced by the wire is also  doubled.

Answer:

A

Explanation: