A very light cart holding a 300-N box is moved at constant velocity across a 15-m level surface. What is the net work done in the process? a. zero b. 1/20 J c. 20 J d. 200 J

Answer:

B

Explanation:

what could i say except ur welcome

Answer:

Explanation:

Average speed is found by adding together the total distances traveled by the athlete and divide that total by the total time it took.

Average velocity is vector, which means it includes direction. If the athlete heads one way and then turns around, his displacement might actually be negative! Yikes! Let's look at speed first:

\(s=\frac{600+1000}{2+1}=\frac{1600}{3}=533\frac{1}{3}\frac{m}{min}\)

Velocity is the displacements added together divided by the total amount of time it took. The displacement is the same as the distance here, since the athlete did not veer off his straight-path and didn't turn around.

Average velocity = average speed = 533.3 m/min

Explanation:

\(h = mc∆T\)

12,570 joules are required to raise the temperature of the same mass ( 0.3 kg ) of 300 g of water from 20 C to 30 C. For specific heat use 4190 J / kg  C . The formula used would be mcΔT.

It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.

12,570 joules are required to raise the temperature of the same mass ( 0.3 kg ) of 300 g of water from 20 C to 30 C. For specific heat use 4190 J / kg  C .

By using the formula for the thermal heat energy,

Heat energy = mcΔT

                     = 0.3 × 4190 × ( 30 -20 )

                      = 12570 Joules

Hence, the formula used for the calculation of the thermal heat energy would be mcΔT.

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Answer:

In chemical weathering minerals are changed into new minerals and mineral byproducts. Some minerals like halite and calcite may dissolve completely. Others, especially silicate minerals, are altered by a chemical process called hydrolysis. Hydrolysis is the reaction of minerals in weakly acidic waters.

Answer:

chemical

Explanation:

The equivalent resistance of the circuit is 21.60 ohms.

When resistors are connected in series, their resistances add up to give the total resistance of the circuit. In this case, we have three 7.20 ohm resistors connected in series. To find the equivalent resistance, we simply add up the individual resistances:

7.20 ohms + 7.20 ohms + 7.20 ohms = 21.60 ohms.

Therefore, the equivalent resistance of the circuit is 21.60 ohms. This means that when a 19.0 V battery is connected to the circuit, the current flowing through the circuit can be calculated using Ohm's Law (I = V/R), where V is the voltage and R is the resistance.

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Answer: When you have more than one battery in a circuit, you add the values of the individual batteries to get the overall voltage of the circuit.

Explanation:

The same thing could reasonably be said about multicollinearity. Specifically, the reason for this is due to the violation of the assumption of independent predictors.

Let us understand what these terms mean:

In statistical analysis, multicollinearity is the high correlation among predictors in a regression model. It is problematic because of its adverse effects on the model, including making it difficult to determine the effect of an independent variable, coefficients becoming insensitive to small changes in the model, and reducing the reliability of the model.

In regression analysis, independent predictors are those variables that contribute to the prediction of the dependent variable or outcome, and their inclusion in the model improves the accuracy of the prediction of the model.

In a regression model, it is an assumption that predictors are independent, which means that the predictors have little to no correlation with each other. If this assumption is violated, it is known as multicollinearity.

Therefore, the same thing could reasonably be said about multicollinearity. Specifically, the reason for this is due to the violation of the assumption of independent predictors.

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Work done to accelerate from rest to speed of 8 m/s = 2496 Joules

According to the work-energy theorem, the net work performed by forces acting on an item equals the change in kinetic energy.

According to the given information

Using the work - energy theorem,

work done is defined as the change in the kinetic energy  \($\mathrm{W}=\frac{1}{2} \mathrm{mv}^2-\frac{1}{2} \mathrm{mu}^2\)= \(\frac{1}{2} \mathrm{~m}\left(\mathrm{v}^2-\mathrm{u}^2\right)$\)

given

\($\mathrm{m}\) =78 \(\mathrm{~kg}$\)

\($u=0 \mathrm{~m} / \mathrm{s}$\)

\($v=8 \mathrm{~m} / \mathrm{s}\)

Hence

\($\mathrm{W}=\frac{1}{2} 78\left(8^2-0^2\right)$\)

\($\Rightarrow \mathrm{W}=\frac{1}{2}(78)(64)$\)

\($\Rightarrow \mathrm{W}=2496 \mathrm{~J}$\)

Work done to accelerate from rest to speed of 8 m/s = 2496 Joules

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Answer:

red supergiants can

Answer:

x rays is the correct answer

Answer:

extrusive igneous rock

Explanation:

According to the question The horizontal velocity of the body is greatest in value at mid-stance for running. the correct option is C

Walking and running are two different ways of travelling by foot, but there are some key differences between them. Running entails a period of time when both feet are in the air and a period of time when both feet are in contact with the ground. When one foot is in contact with the ground, walking always has at least one foot in contact with the ground, whereas running requires both feet to be off the ground for a portion of the stride cycle. These differences affect the way that force is applied to the body, particularly the legs and feet.

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The speed and time have a linear relationship. It is independent of mass. The upper limit is a)Mg/c and b)gt.

What exactly does acceleration mean?

A moving material experiences acceleration when its speed and trajectory vary over time. When anything moves quicker or longer, it is said to have been accelerated. Rotation on a circle accelerated despite the same speed since this heading is always changing.

What causes a speedup?

An object's motion is influenced by a net force; the larger the net force, the greater the acceleration. Greater net pressures are needed for more massive things to accelerate at the same rate as less massive things.

Briefing:

a) lim t-->∞  v = mg/c

 mg/c is the limit

2)It is the rate at which the item gets closer as time passes.

b) lim c-->0^(+)   v = gt.

 gt is the limit

3)The speed and time have a linear relationship. It is independent of mass. Since mass has no bearing on acceleration, an item will fall faster the longer it is in free fall.

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When the toy is thrown at an angle above the horizontal, with the string remaining taut and both spheres revolving counterclockwise in a vertical plane around the center of the string, it exhibits a rotational motion.

The string acts as the axis of rotation. The centripetal force required for this motion is provided by the tension in the string. As the toy rotates, both spheres experience an equal and opposite tension force. This tension force allows the spheres to maintain a circular path.

Additionally, the tension force in the string is always directed towards the center of the circular motion, keeping the spheres from flying apart. The angle at which the toy is thrown affects the speed and radius of the circular motion.

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The switch that adjusts the magnetic field to be either nearly uniform or have a strong gradient will affect the current in the two coils differently.

When the magnetic field is nearly uniform at the center, the current in both coils will remain relatively unchanged. The uniform field will not induce any significant voltage in the coils, so the current will flow through them as usual.

However, when the magnetic field has a strong gradient, the current in the two coils will be affected differently. The rapidly changing field will induce a voltage in the coils according to Faraday's law of electromagnetic induction. This induced voltage will result in a change in the current flowing through the coils. The magnitude and direction of the induced current will depend on the specific characteristics of the coils and the magnetic field gradient.

In summary, the switch that changes the magnetic field from uniform to having a strong gradient will induce a change in the current flowing through the coils due to the induced voltage.

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Answer:

W = 76 N

Explanation:

In this exercise you are asked to find the weight of the body.

Mass is a quantity that is invariant, it measures the same everywhere, the weight depends on where it is measured, a simple way to find the weight of a body is

          W = g m

where g is the constant of the place, in this case we have the weight of the body on Mars and its mass which is constant on Earth and on Mars

            W = 3.8 20

            W = 76 N

Hi there!

\(\large\boxed{d = 162.5m}\)

Find the distance traveled using the kinematic equation:

d = vi(t) + 1/2(a)(t²)

In this instance, vi = 0 because the object was initially at rest. Plug in the other values to solve:

d = 0t + 1/2(13)(5²)

d = 1/2(13)(25)

d = 162.5m

Answer:

The degree of exactness of a measurement is called precision.

:)

Momentum = (mass) x (velocity)

On the way to the plate, the momentum of the ball was

(0.15 kg) x (40 m/s this way <==) = 6 kg-m/s this way <==

After the hit, the momentum of the ball was

(0.15 kg) x (45 m/s that way ==>) = 6.75 kg-m/s that way ==>

The CHANGE in momentum was 12.75 kg-m/s that way ==>

That's the momentum that the bat gave it.

Change in momentum = Impulse

Impulse = (force) x (length of time the force lasts)

12.75 kg-m/s = (force) x (0.002 second)

Force = (12.75 kg-m/s) / (0.002 second)

Force = 6,375 Newtons, that way ==>

Answer:

A. The kilometers unit is cancelled out and the result shown is 828 meters.

B. 828 meters are found in 0.828 Kilometers

C. Yes

Explanation:

A. When the 1000 meters/1 kilometer tile is dragged down, the kilometers unit is cancelled out and the value 828 meters appears.

This is because the kilometers appear in the numerator of one term and in the denominator of another, they cancel, or disappear. The process of converting units by canceling is called dimensional analysis.

B. 0.828 Kilometers * 1000 meters/1 kilometer = 828 meters

Therefore, there are 828 meters in 0.828 kilometers.

C. A meter is a much shorter unit of measurement than a kilometer. Based on this fact, it does make sense that 0.828 Kilometers which is less than 1 kilometer is equal to 828 meters.

(A) The process of converting units by canceling is called dimensional analysis.

(B)  There are 828 meters in 0.828 kilometers.

(C) It does make sense that  0.828 Kilometers which is less than 1 kilometer is equal to 828 meters.

The given problem is based on some basic fundamentals and applications of dimensional analysis. So as per the given problem, each subpart says,

A.

When the 1000 meters/1 kilometer tile is dragged down, the kilometers unit is cancelled out and the value 828 meters appears.

This is because the kilometers appear in the numerator of one term and in the denominator of another, they cancel, or disappear. The process of converting units by canceling is called dimensional analysis.

Thus, we can conclude that the process of converting units by canceling is called dimensional analysis.

B.

Converting the given value of kilometers into the meters as,

0.828 Kilometers * 1000 meters/1 kilometer = 828 meters

Thus, we can conclude that there are 828 meters in 0.828 kilometers.

C.

A meter is a much shorter unit of measurement than a kilometer. Based on this fact, it does make sense that 0.828 Kilometers which is less than 1 kilometer is equal to 828 meters.

Thus, we can conclude that it does make sense that  0.828 Kilometers which is less than 1 kilometer is equal to 828 meters.

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The time taken for the light to reach you, given that you are 150000 meters away is 0.0005 second

From the question given above, the following data were obtained:

The time taken for the light to reach you can be obtained as illustrated below:

Speed = distance / time taken

300000000 = 150000 / time taken

Cross multiply

300000000 × time taken = 150000

Divide both sides by 300000000

Time taken = 150000 / 300000000

= 0.0005 second

Thus, we can conclude that the time taken is 0.0005 second

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The required volume of the gas is 0.52 L.

Diminishing the volume of a contained gas will expand its tension, and expanding its volume will diminish its strain. As a matter of fact, on the off chance that the volume increments by a specific variable, the tension declines by a similar element, as well as the other way around.

V1 = 1.56 L, P1 = 1 atm, P2 = 3 atm,

To find: V2 of gas

So, P1V1 = P2V2

V2 = P1V1/P2

V2 = 1.56(1)/3 = 0.52 L

Thus, required volume of gas is 0.52L

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Correct question:

A gas occupies 1.56 l at 1.00 ATM what will be the volume of this gas if the pressure becomes 3.00 ATM

The question addresses the stability of the atmosphere and the factors that determine convective stability or instability. It also explains the difference between the adiabatic lapse rate of dry air and wet saturated air.

a) The stability of the atmosphere is determined by the temperature profile and relative densities of the air cell and atmosphere. If the temperature of the surrounding atmosphere decreases with altitude at a rate greater than the adiabatic lapse rate of the air cell, the atmosphere is considered convectively stable.

In this case, the air cell will return to its original position. Conversely, if the temperature of the surrounding atmosphere decreases slower than the adiabatic lapse rate of the air cell, the atmosphere is convectively unstable. The air cell will continue moving in the same direction.

b) The adiabatic lapse rate refers to the rate at which temperature decreases with altitude for a parcel of air lifted or descending adiabatically (without exchanging heat with its surroundings). The adiabatic lapse rate of dry air is higher (around \(9.8^0C\) per kilometer) compared to the adiabatic lapse rate of wet saturated air (around 5°C per kilometer).

This difference arises because when water vapor condenses during the ascent of saturated air, latent heat is released, reducing the rate of temperature decrease. A diagram can illustrate the difference between the two lapse rates, showcasing their respective slopes.

c) When wet unsaturated air rises from the ocean surface, its temperature decreases at a rate equal to the dry adiabatic lapse rate. However, if the ambient lapse rate (temperature decrease with altitude) is higher than the adiabatic lapse rate for dry air, a temperature inversion layer forms at higher altitudes.

In this inversion layer, the temperature increases with altitude instead of decreasing. A schematic diagram can depict the temperature changes of the wet air in comparison to the ambient temperature, showing the inversion layer.

Cumulus clouds form at the altitude where the rising moist air reaches the level of the temperature inversion layer. These clouds are formed due to the condensation of water vapor as the air parcel cools to its dew point temperature.

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Explanation:

One prong is known as the hot wire, where the electricity comes in, while the second prong is the neutral wire and electricity leaves. Recall that a circuit must be made for electrons to flow. This means that electrons enters your house through the transmission wires and then the electrons leave along the same lines they entered (just along a different wire).

This set up describes a 2 pronged cord. Adding a third prong allows for a grounding to happen. In the event of an electrical surge, when too many electrons are flowing, disaster is likely to happen without some kind of safety features. The grounding prong allows electrons to seek the ground. You can think of it like a drain in a bathtub when too much water gets in the tub.

Answer:

3 pronged cord

Explanation:

Rocks on the moon are older than the oldest rocks on earth, it is because the moon has not gone through much geological activity since it was formed and has remained potentially static for a very long period. It is comparatively smaller, so it cooled rapidly. Most of the moon's surface has not been subjected to geological modification as it has happened with the rocks on earth.

The surface of the earth was periodically subjected to volcanic activities, plate tectonics, and erosion. Earth's surface has also been subjected to  intense destruction by asteroids and comets for a long period of time. On the contrary moon's surface is largely static, less proned to tectonic movements, volcanic activity, erosion and bombardment by asteroids and comets

The movement of tectonic plates in the earth's lithosphere and the eruption of volcanoes effectively "recycle" the rock on the surface, thereby causing the older rocks to get burried and consumed. This process leads to the formation of new rocks and this cyclic process continues. Also the erosion effects by water and winds has enhanced the process of rock cycle. Collectively all these factors have pevented the the rocks to remain older and has recycled it with time.

Whereas this is not the case on the moon. The rocks on moon have not been subjected to erosion and weathering. It ha remained unultered and static for a long time. The absence of rock cycle has caused the older rocks on moon to remain older wit time.

Therefore, the limited geological acivities and very stagnant rock cycle is the major reason why the oldest Moon rocks are older than Earth's oldest rocks, even though both worlds formed at nearly the same time.

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Answer:

4a. –2.5 m/s²

4b. 375 m

5. 7.5 s

Explanation:

4. The following data were obtained from the question:

Initial velocity (u) = 50 m/s

Final velocity (v) = 25 m/s

Time (t) = 10 s

Acceleration (a) =?

Displacement (s) =?

4a. Determination of the acceleration of the car.

Initial velocity (u) = 50 m/s

Final velocity (v) = 25 m/s

Time (t) = 10 s

Acceleration (a) =?

a = (v – u) /t

a = (25 – 50)/10

a = –2.5 m/s²

The negative sign indicate that the car is decelerating.

4b. Determination of the displacement of the car.

Initial velocity (u) = 50 m/s

Final velocity (v) = 25 m/s

Time (t) = 10 s

Displacement (s) =?

s = (v + u)t / 2

s = (25 + 50) × 10 / 2

s = (75 × 10) / 2

s = 750 / 2

s = 375 m

Thus, the displacement of the car is 375 m

5. The following data were obtained from the question:

Initial velocity (u) = 30 m/s

Final velocity (v) = 0 m/s

Acceleration (a) = – 4m/s²

Time (t) =?

The time taken for the car to stop can be obtained as follow:

v = u + at

0 = 30 + (–4 × t)

O = 30 – 4t

Collect like terms

0 – 30 = –4t

–30 = –4t

Divide both side by –4

t = –30 / –4

t = 7.5 s

Thus, it will take 7.5 s for the car to completely stop.

Answer: 4 herz is the correct answer trust me!!!!!

Explanation:

The semi-major axis an of the ellipse and the period of revolutions T of a planet around the sun are related by the formula T2 = k a3.

An elliptical helps speed up the process of losing body fat since it burns more calories per minute than some other cardio equipment, such as the stationary cycle. This is particularly true if you emphasize interval training.

The best machine for you will depend on your specific requirements. Keep using the elliptical if you have a neuromuscular ailment or are prone to injuries. if you really want to increase your calorie burn while strengthening your legs.

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Answer:

Explanation:

\(Average- velocity = \frac{displacement }{time} \\A.V = \frac{100}{5} \\A.V = 20\)