A car starts from rest and travels 25 m in 5 seconds at constant velocity. It then reverses 5 m in 10 seconds at constant velocity. The car then sits at rest for 5 seconds before it reverses at constant velocity back to where it started in 10 seconds time. Draw a position time graph that demonstrates the motion of the car.

Answer:

The impulse transferred to the nail is 0.01 kg*m/s.

Explanation:

The impulse (J) transferred to the nail can be found using the following equation:

\( J = \Delta p = p_{f} - p_{i} \)

Where:                                                                

\(p_{f}\): is the final momentum

\(p_{i}\): is the initial momentum

The initial momentum is given by:

\( p_{i} = m_{1}v_{1_{i}} + m_{2}v_{2_{i}} \)

Where 1 is for the hammer and 2 is for the nail.

Since the hammer is moving down (in the negative direction):

\(v_{1_{i}} = -10 m/s \)

And because the nail is not moving:

\(v_{2_{i}}= 0\)                      

\( p_{i} = m_{1}v_{1_{i}} = 0.25 kg*(-10 m/s) = -2.5 kg*m/s \)

Now, the final momentum can be found taking into account that the hammer remains in contact with the nail during and after the blow:

\( p_{f} = m_{1}v_{1_{f}} + m_{2}v_{2_{f}} \)

Since the hammer and the nail are moving in the negative direction:

\(v_{1_{f}}\) = \(v_{2_{f}}\) = -9.7 m/s

\( p_{f} = -9.7 m/s(7 \cdot 10^{-3} kg + 0.25 kg) = -2.49 kg*m/s \)

Finally, the impulse is:

\( J = p_{f} - p_{i} = - 2.49 kg*m/s + 2.50 kg*m/s = 0.01 kg*m/s \)

Therefore, the impulse transferred to the nail is 0.01 kg*m/s.

I hope it helps you!                                                                                                                                                                                                                                                                                                                                                                                                                    

Displacement at 10s

\(\\ \bull\tt\dashrightarrow Velocity\times Time\)

\(\\ \bull\tt\dashrightarrow 5(10)=50m\)

Displacement at next 5s

\(\\ \bull\tt\dashrightarrow -8(5)=-40m\)

Now

Total displacement=50-40=10m

Answer:

Its water molecules were broken apart, and hydrogen was lost to space. What kind of gas is most affected by thermal escape? What causes the release of oxygen into Earth's atmosphere?

Explanation:

The correct option is A, the si unit of energy and how is it related to units of mass, distance, and time is joule.

The joule is a unit of measurement used to express energy or work done. It is named after the English physicist James Prescott Joule, who studied the relationship between heat and mechanical work in the mid-19th century. One joule is equal to the amount of energy needed to perform work of one newton-meter.

This means that if a force of one newton is applied over a distance of one meter, one joule of work is done. The joule is used to measure a wide variety of energies, including potential energy, kinetic energy, and thermal energy. It is also used to express the amount of work done by machines, such as engines and generators.

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Complete Question: -

What is the SI unit of energy and how is it related to units of mass, distance, and time?

a. joule

b. watt

c. kilo

d. Newton

Carver's difficult childhood, marked by poverty and racial discrimination, deeply influenced his writing and his commitment to promoting social justice through his work.

Raymond Carver was born in 1938 in Clatskanie, Oregon, and grew up in Yakima, Washington. His childhood was marked by poverty, his father's alcoholism, and his family's experience of racial discrimination.

Despite these challenges, Carver developed a deep love of literature and writing, and he began to write poetry and fiction at a young age. Carver's difficult upbringing deeply influenced his writing, which often explored themes of working-class life, poverty, and the struggles of everyday people. Throughout his career, Carver remained committed to promoting social justice through his work, and his writing continues to inspire readers and writers alike with its raw honesty, compassion, and humanity.

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(a) The angle the rifle should  be pointed to give the maximum range is 45⁰.

(b) The maximum range of the bullet is 47,183.7 m.

The maximum range of the raffle is calculated by applying the following kinematic equation.

R = u² sin(2θ) / g

where;

At the maximum range, the angle of projection = 45⁰

The maximum range of the bullet is calculated as follows;

R = u² sin(2θ) / g

R = (680² x sin(2 x 45) ) / 9.8

R = 47,183.7 m

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A. The angle at which the rifle should be pointed to give the maximum range is 45 degrees.

B. The maximum range of the bullet is 4383.5 m

A. How do I determine the angle for maximum range?

projectile motion involves motion which follows a parabolic path.

However, to obtain a maximum range for projectile motion, the angle of projection must be 45 degrees

B. How do I determine the maximum range?

The maximum range of the bullet can be obtained as follow:

R = u²Sine(2θ) / g

R = [207.264² × Sine (2×45)] / 9.8

R = 4383.5 m

Thus, the maximum range is 4383.5 m

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The steel ball if A tennis ball and a solid steel ball of the same diameter are dropped at the same time. Ignoring air resistance effects greater acceleration .

di·​am·​e·​ter dī-ˈam-ət-ər. : a straight line passing through the center of a figure or body. especially : a line segment through the center of a circle with its ends on the circle's circumference. : the length of a diameter.

A. Circumference is the length of one complete 'lap' around a circle, and diameter is the length of the line segment that cuts a circle in half. Think of circumference as an outer measurement and diameter as an inner measurement of the circle.

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Answer:

d your welcome

Explanation:

80%  is the appliance's efficiency

Why do appliances use less energy?

Among the several advantages of energy efficiency are: Environmental: Greater efficiency can reduce water use, greenhouse gas (GHG) emissions, and other pollutants. Economic benefits of energy efficiency improvements include reduced utility costs, job growth, and reduced price fluctuation of power.

Utilizing the formula below, efficiency may be represented as a ratio: Output ÷ Input. The total amount of beneficial work accomplished, excluding waste and spoilage, is known as output or work output. Efficiency can also be expressed as a percentage by dividing the ratio by 100.

Efficiency will be 4/5 *100 i.e. 80%

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Explanation:

for the walking distance it did not matter in what direction the kid walked.

a. the distance of the walk is 500 + 300 = 800 m

b. the kid ended up 500-300=200 m north of the original point.

Answer:

3.141592653 im  king of NYC

Explanation:

Answer: Conversion of 9.83 m/s with a radius of 0.85 m into rotations per minute (rpm) is \(99.25 m^{-1}\).

Explanation:

Given: Speed = 9.83 m/s

Convert m/s into m/minute as follows.

\(1 min = 60 sec\\9.83 m/s = 9.83 m/s \times \frac{60 s}{1 min}\\= 529.8 m/min\)

Radius = 0.85 m

Now, rotations take place in circular motion. So, the circumference of a circle is \(2 \pi r\).

Therefore, circumference is calculated as follows.

\(Circumference = 2 \times pi \times r\\= 2 \times 3.14 \times 0.85 m\\= 5.338 m\)

Formula used to calculate rotations per minute (rpm) are as follows.

\(rpm = \frac{speed (in meter per minute)}{circumference}\\= \frac{529.8 m/min}{5.338 m}\\= 99.25 m^{-1}\)

Thus, we can conclude that conversion of 9.83 m/s with a radius of 0.85 m into rotations per minute (rpm) is \(99.25 m^{-1}\).

Answer:

(a) \(\frac{P_{250k}}{P_{2000k}}=2.4\ x\ 10^{-4}\)

(b) P =  0.816 Watt

Explanation:

(a)

The power radiated from a black body is given by Stefan Boltzman Law:

\(P = \sigma AT^4\)

where,

P = Energy Radiated per Second = ?

σ = stefan boltzman constant = 5.67 x 10⁻⁸ W/m².K⁴

T = Absolute Temperature

So the ratio of power at 250 K to the power at 2000 K is given as:

\(\frac{P_{250k}}{P_{2000k}}=\frac{\sigma A(250)^4}{\sigma A(2000)^4}\\\\\frac{P_{250k}}{P_{2000k}}=2.4\ x\ 10^{-4}\)

(b)

Now, for 90% radiator blackbody at 2000 K:

\(P = (0.9)(5.67\ x\ 10^{-8}\ W/m^2.K^4)(1\ x\ 10^{-6}\ m^2)(2000\ K)^4\)

P =  0.816 Watt

When a rope of length L and mass m is suspended from the ceiling, the tension in the rope at position y can be found using the following expression:

T(y) = mg + λy where g is the acceleration due to gravity, λ is the linear mass density of the rope, and y is the distance measured upward from the free end of the rope.

Here's how to derive the expression: Let's consider an element of length dy of the rope at a distance y from the free end of the rope. The weight of the element is dm = λdy and acts downward. The tension in the rope on the element can be resolved into two components - one acting downward and another acting upward. Let T be the tension in the rope at point y and T + dT be the tension in the rope at point (y + dy).The upward component of tension on the element is given by Tsinθ, where θ is the angle between the element and the vertical. As the rope is assumed to be in equilibrium, the horizontal components of tension balance each other and the net vertical force on the element is zero. Therefore, we have,

Tsinθ - dm g = 0 ⇒ Tsinθ = dm g ⇒ Tsinθ = λdyg

The angle θ can be found using the equation tanθ = dy/dx ≈ dy/dy = 1. Therefore, sinθ = dy/√(dy²+dx²) ≈ dy and we have,T dy = λdyg ⇒ T = λgThis expression gives the tension in the rope at the free end of the rope. The tension in the rope at position y, measured upward from the free end of the rope is given by,T(y) = mg + λy

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In a 32-bit architecture, an integer pointer typically occupies 4 bytes of memory. When you add 5 to the integer pointer (iptr = iptr + 5), the address stored in the pointer will move by a certain number of bytes based on the size of the data type it points to.

Since we are assuming a 32-bit architecture, the pointer iptr will move by 5 times the size of the data type it points to. Since an integer occupies 4 bytes in a 32-bit architecture, the address stored in iptr will move by:5 * 4 bytes = 20 bytes. Therefore, when you add 5 to the integer pointer iptr in a 32-bit architecture, the address will move by 20 bytes.

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Explanation:

Since the weight hangs motionless from the spring, the weight is not in motion and is balanced from vertical components of force ( the spring force and the mg of the weight) so

\(f _s = mg\)

where f s is the force of the spring.

Now, we can use Hooke Law

\(f _{s} = kx\)

where k is the spring constant and x is the displacement of length the spring is stretched.

We know that mg=fs so

\( mg = kx\)

mg=w so

\(w = kx\)

k is 75 and x is 0.333

so

\(x = 75 \: \frac{n}{m} \times 0.33 \: m\)

\(x = 24.975 \: n\)

or

25 N or 24.98 N

Answer:

Ohms law states that current is directly proportional to the potential difference across the ends of a conductor provided that temperature and other factors kept constant

\(V=I(R)\)

Answer: Different types of fuels have varying compositions and release different amounts of pollutants when burned. Here are some common types of fuels and the pollutants associated with them:

Fossil Fuels:

a. Coal: When burned, coal releases pollutants such as carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen oxides (NOx), and particulate matter (PM).

b. Petroleum (Oil): Burning petroleum-based fuels like gasoline and diesel produces CO2, SO2, NOx, volatile organic compounds (VOCs), and PM.

Natural Gas:

Natural gas, which primarily consists of methane (CH4), is considered a cleaner-burning fuel compared to coal and oil. It releases lower amounts of CO2, SO2, NOx, VOCs, and PM.

Biofuels:

Biofuels are derived from renewable sources such as plants and agricultural waste. Their environmental impact depends on the specific type of biofuel. For example:

a. Ethanol: Produced from crops like corn or sugarcane, burning ethanol emits CO2 but generally releases fewer pollutants than fossil fuels.

b. Biodiesel: Made from vegetable oils or animal fats, biodiesel produces lower levels of CO2, SO2, and PM compared to petroleum-based diesel.

Renewable Energy Sources:

Renewable energy sources like solar, wind, and hydropower do not produce pollutants during electricity generation. However, the manufacturing, installation, and maintenance of renewable energy infrastructure can have environmental impacts.

It's important to note that the environmental impact of a fuel also depends on factors such as combustion technology, fuel efficiency, and emission control measures. Additionally, advancements in clean technologies and the use of emission controls can help mitigate the environmental impact of burning fuels.

Answer:

A. wind blows from the land toward the sea.

B. that this happens because the land cools faster than the sea, and, as a result, the air over land cools faster, which creates an area of higher pressure on land and lower pressure over the sea.

Explanation:

bc I am smrt

PLZ thank five star

and brainliest would be appreciated:-)

Answer:

The loudness of sound is most closely related to

The pressure within a sound wave determines the loudness of the sound. In this lesson, learn how to calculate the sound pressure level of a sound wave and what this measurement represents.

Explanation:

The geocentric model says that the earth is at the center of the cosmos or universe, and the planets, the sun and the moon, and the stars circles around it. The early heliocentric models consider the sun as the center, and the planets revolve around the sun.

When electricity to an electromagnet is stopped the magnetic strength of the magnet will be lost.

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Answer:

A. Endurance is important for participating in sports because it provides the energy needed to maintain physical activity for long periods of time.

Endurance allows an individual to sustain prolonged physical activity by delivering oxygen and nutrients to the muscles, which helps to delay fatigue and improve overall performance. Endurance training can improve cardiovascular health, increase muscular endurance, and enhance overall physical fitness, making it an essential component of sports performance. Short spurts of energy (C) are more related to anaerobic activities and do not rely on endurance, while option B is incorrect as it contradicts the importance of endurance, and option D is a partial truth but not the most comprehensive answer.

Answer:

Yes,it can be mixed.

Explanation:

As we travel down the group in the current periodic table, the atomic number rises. Although the nuclear charge likewise rises, the effect of the rise is mitigated by the addition of one shell. As we descend the group, electronegativity's value drops. For instance, in the halogen group, the electronegativity value falls as we proceed from fluorine to astatine.

Electronegativity is the propensity of an atom in a molecule to draw the shared pair of electrons toward itself.

Because it is merely a propensity, this attribute has no dimensions. It essentially represents the final consequence of atoms' propensities to attract electron pairs that form bonds in various elements. On several scales, we quantify electronegativity. Linus Pauling created the most widely used scale.

An atom's ability to attract the electrons of a bond grows with electronegativity, a feature of an atom. In a covalent bond, atoms that are bound together and have similar electronegativity values share electrons equally.

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160000 kgm/s is the impulse of the car. ​

J=mΔv

I= impulse

m= mass= 2000kg

Δv=  change in velocity= 80 km

J=mΔv

I= 2000kg×80 km/s

I=160000 kgm/s

The concept of impulse is used to describe how a net force affects an item (a kind of "moving force"). Impulse is denoted by the letter J.  The average net force acting on an item over time is calculated as an impulse. The force-time integral is J = Ft. The vector quantity of impulse is J = F dt (since force is a vector and time is a scalar).

Theorem of Impulse-Momentum According to the impulse-momentum theorem, an object's change in momentum equals the impulse that was delivered to it. J = ∆p The newton second is the SI unit for impulse. The kilogram meter per second is the SI unit for momentum. These momentum and impulse units are the same.

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The total mechanical energy of the bicyclist is 1400 J, obtained by adding her potential energy of 720 J and kinetic energy of 680 J. The correct answer is option B.

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c.

Explanation:!(*´∇`)ﾉ