(Conservation of Momentum)
Consider a 2,000 kg car traveling 10 m/s toward another car.After the two cars collide, they couple together and move along at 6 m/s. What is the mass of the second car?
Can someone please solve and explain,I don’t understand:/

The thermal conductivity of the metal is approximately B, 241 W/(m · K).

To find the thermal conductivity (k) of the metal, use the formula:

Q = k × A × (ΔT/Δx) × t

Where:

Q = Heat conducted by the rod (in Joules)

A = Cross-sectional area of the rod (in square meters)

ΔT = Temperature difference across the rod (in Kelvin)

Δx = Length of the rod (in meters)

t = Time (in seconds)

Given:

Q = 8.5 g of ice melted = 8.5 × Lf (latent heat of fusion of ice)

Lf = 3.34 × 10⁵ J/kg

Δx = 60 cm = 0.6 m

A = 1.25 cm² = 1.25 × 10⁻⁴ m²

t = 10 min = 600 seconds

ΔT = (100°C - 0°C) = 100 K

Substituting the given values into the formula:

8.5 × Lf = k × (1.25 × 10⁻⁴) × (100 K / 0.6 m) × 600 s

Simplifying the equation:

k = (8.5 × Lf) / [(1.25 × 10⁻⁴) × (100 K / 0.6 m) × 600 s]

Calculating the value:

k = (8.5 × 3.34 × 10⁵) / [(1.25 × 10⁻⁴) × (100 / 0.6) × 600]

k ≈ 241 W/(m · K)

Therefore, the thermal conductivity of the metal is approximately 241 W/(m · K).

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Answer:

41.52 m

Explanation:

Using,

v = d/t....................... Equation 1

v = speed of pulse of sound, d = distance travelled by the pulse of sound, t = total time taken.

From equation 1, make d the subject of the equation

d = vt............................ Equation 2

Given: t = 0.12 s.

Constant: v = 346 m/s

Susbtitute these values into equation 2

d = 346(0.12)

d = 41.52 m

The probability that a string of Christmas lights containing 20 lights are wired in series, so that if any light fails, the whole string will go dark = 0.6676 = 66.76%

There are just two conceivable outcomes for each light: either it works or it doesn't. The binomial distribution is utilized to answer this question since the likelihood that a light will operate independently of all other lights.

It's a binomial experiment. Since the bulbs are independent and there is only one way the string can stay lit

The success probability is:

1 -0.02 = 0.98

Hence, the probability that the string of lights will remain bright for 3 years ​is:

(0.98)²₀ = 0.667

= 66.67%

The question is incomplete, it should be:

Merry and bright? A string of Christmas lights contains 20 lights. The lights are wired in series, so that if any light fails, the whole string will go dark. Each light has probability 0.98 of working for a 3-year period. The lights fail independently of each other. Find the probability that the string of lights will remain bright for 3 years.

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So, your science teacher has given your class the classic "mousetrap car" assignment: to make, design, and build a small vehicle powered by the snapping action of a mousetrap to make your car travel as far as possible. If you want to come out ahead of all the other students in your class, you'll need to make your car as efficient as possible so you can squeeze every last inch out of your "car". With the right approach, it's possible to streamline your car's design for maximum distance using only common home materials. You could also buy a mousetrap car kit from any craft store and skip wondering if it will work.

Use large rear wheels. Large wheels have greater rotational inertia than small wheels. In practice, this means that once they start rolling, they're harder to stop rolling. This makes large wheels perfect for distance-based contests — theoretically, they'll accelerate less quickly than smaller wheels, but they'll roll much longer and they'll travel a greater distance overall. So, for maximum distance, make the wheels on the drive axle (the one the mousetrap is tied to, which is usually the rear one) very large. The front wheel is a little less important — it can be large or small. For a classic drag racer look, you'll want big wheels in the back and smaller ones in front.

Use thin, light wheels. Thinner wheels have less friction and may go farther if the distance is what you want or need with your mousetrap racer. It's also important to take the weight of the wheels themselves into account — any unneeded weight will ultimately slow your car down or lead to added friction. In addition, it's worth noting that wide wheels can even have a small negative effect on the car's drag due to air resistance. For these reasons, you'll want to use the thinnest, lightest wheels available for your car.

Old CDs or DVDs work fairly well for this purpose — they're large, thin, and extremely light. In this case, a plumbing washer may be used to reduce the hole size in the middle of the CD (to fit the axle better).

If you have access to old vinyl, these also work extremely well, though they may be too heavy for the smallest mousetraps.

Use a narrow rear axle. Assuming your car is a rear-wheel-drive car, each time your rear axle turns, the rear wheels turn. If your rear axle is extremely skinny, your mousetrap car will be able to turn it more times for the same length of string than it would if it were wider. This translates to turning your rear wheels more times, meaning greater distance! For this reason, it's a wise idea to make your axle out of the skinniest material available that can still support the weight of the frame and wheels.

Narrow wooden dowel rods are a great, easily-accessible choice here. If you have access to thin metal rods, these are even better — when lubricated, they usually have less friction.

Create traction by giving the edges of the friction of the wheels. If the wheels slip against the ground when the trap is sprung, energy is wasted — the mousetrap works to make the wheels turn, but you don't get any extra distance. If this happens with your car, adding a friction-inducing material to the rear wheels may reduce their slippage. To keep your weight requirements down, use only as much as is necessary to give the tips of the wheels some grip and no extra. Some suitable materials are:[1]

Electrical tape

Rubber bands

Additionally, placing a piece of sandpaper under the rear wheels at the start line can reduce slippage as the car begins to move (when it is most likely)

Answer:

The distance between dots on a dot diagram represents the object's position change during that time interval. A large distance between dots indicates that the object was moving fast during that time interval. A small distance between dots means the object was moving slow during that time interval.

Physical education objectives that may be accomplished in public and private sector physical education and sports programs include improving overall physical fitness and health, promoting teamwork and sportsmanship, developing motor skills and coordination, and fostering a lifelong love of physical activity.

These programs can help enhance cognitive and academic performance, build self-confidence and self-esteem, and instill values. Both public and private sector programs can provide access to a wide range of physical activities and sports, including individual and team sports, outdoor recreation, and fitness and wellness programs. The ultimate goal of these programs is to promote a healthy and active lifestyle among participants.

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Moving a charge around on an equipotential surface at potential V with constant speed requires no work. This is because the equipotential surface is defined as a surface where the potential is constant, meaning that the potential energy of the charge at any point on the surface is the same. Since work is defined as the transfer of energy from one form to another, and no energy is being transferred in this case, no work is required.

To illustrate this concept, imagine a ball rolling on a flat surface. The ball will continue to roll with constant speed, and no additional work is required to keep it moving at that speed. Similarly, a charge moving on an equipotential surface at potential V will continue to move at a constant speed without any additional work being required.

It's important to note that this only applies to motion along an equipotential surface. If the charge were to move from one equipotential surface to another with a different potential, work would be required to change the potential energy of the charge.

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The horizontal distance travelled by the football is 3.1 m.

The angle of projection of the football is calculated as follows;

tan ( θ ) = Vy / Vx

where;

tan ( θ ) = 5 / 3

tan ( θ ) = 1.667

θ = arc tan (1.667)

θ = 59⁰

The resultant velocity of the ball is calculated as follows;

v = √ (Vx² + Vy²)

v = √ (3² + 5²)

v = 5.83 m/s

The horizontal distance travelled by the football is calculated as follows;

x = v² sin(2θ) /g

where;

x = [ (5.83)² sin(2 x 59) /9.8 ]

x = 3.1 m

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The growth of refurbished and reconditioned electronics on companies' websites is a result of the growth of the "reverse supply chains" process.

Reverse supply chains refer to the activities involved in the collection, refurbishment, and resale of used or returned products. It is a process that focuses on the efficient management of product returns and the recovery of value from previously owned goods.

So, By engaging in reverse supply chains, companies can extend the product life cycle, reduce waste, and offer refurbished or reconditioned products to customers at lower prices. This process allows companies to maximize the value of returned or used products and cater to customers who are looking for bargains, as in Sarah's case.

Hence, The growth of refurbished and reconditioned electronics on companies' websites is a result of the growth of the "reverse supply chains" process.

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When air rises in a low-pressure system, it can lead to the formation of clouds and precipitation, such as rain or snow. The rising air also cools and condenses, releasing latent heat, which can further contribute to the development of the storm.

A low-pressure system is a weather pattern characterized by a region of lower atmospheric pressure compared to the surrounding areas. It is often associated with unsettled and stormy weather.

Clouds are formed when moist air rises and cools, causing water vapour to condense into tiny water droplets or ice crystals. This process occurs when the temperature of the air decreases, either because it is rising, or because it is mixing with cooler air.

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The x -component of this vector is 0, because it's in the direction of travel.

The x -component of the tangential acceleration is the acceleration parallel to the road. This can be found by defining a vector from the point of interest to the origin, and then finding its magnitude.

When you're driving a car, your acceleration is always changing as you move around curves in the road. The x-component of this acceleration can't change because it depends on your speed. If you're going faster, then your x-component goes up; if you're going slower, it goes down.

The x-component of your acceleration is always constant: no matter how fast or slow you go around a curve, your acceleration will always be parallel to the road—and therefore, also constant at any point along a curve.

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Answer:

Work done= Energy transferred

Explanation:

Work is the transfer of energy. In physics we say that work is done on an object when you transfer energy to that object. If you put energy into an object, then you do work on that object (mass).

The charge of the particle should be approximately 5.2 microcoulombs (μC) in order for it to remain stationary in the given electric field.

To determine the charge (sign and magnitude) of the particle that remains stationary in a downward-directed electric field of magnitude 650 N/C, we can use the equation F = qE, where F is the electric force, q is the charge, and E is the electric field.

Since the particle is stationary, the electric force must balance the force of gravity acting on the particle. The force of gravity can be calculated using the equation F = mg, where m is the mass of the particle and g is the acceleration due to gravity.

Setting the two forces equal to each other, we have mg = qE.

Given that the mass of the particle is 3.45 g (which is equivalent to 0.00345 kg) and the electric field magnitude is 650 N/C, we can rearrange the equation to solve for the charge:
q = mg/E

Plugging in the values, we get:
q = (0.00345 kg)(9.8 m/s^2) / 650 N/C

Simplifying the expression gives us:
q ≈ 5.2 × 10^(-6) C

Therefore, the charge of the particle should be approximately 5.2 microcoulombs (μC) in order for it to remain stationary in the given electric field.

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Answer:

r = 0.174 m

Explanation:

gravitational force equation

F is the force of attraction,

G is the gravitational constant (6.6743 x 10^-11 N*m^2/kg^2),

m1 and m2 are the masses of the two students, and

r is how far apart are the students sitting

F = G * (m1 * m2) / r^2

N = Newtons = kg⋅m/s^2

2.30 x 10^-8 N = (6.6743 x 10^-11 N*m^2/kg^2) * (45.0 kg * 55.0 kg) / r^2

r^2 = (6.6743 x 10^-11 N*m^2/kg^2) * (45.0 kg * 55.0 kg) / (2.30 x 10^-8 N)

r^2 = (6.6743 x 10^-11 kg⋅m/s^2*m^2/kg^2) * (45.0 kg * 55.0 kg) / (2.30 x 10^-8 kg⋅m/s^2)

Take the square root of both sides, we get:

r = 0.174 m

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Answer:

15 KJ

Explanation:

The quantity of heat (Q) required is given as:

Q = mcΔθ + mL

where m is the mass of ice, c is its specific heat capacity, L is its specific latent heat andΔθ is the change in temperature.

Given: m = 20g, temperature of ice = 0\(^{o} C\), specific heat capacity of water = 4200 J/kg\(^{o} C\), latent heat of fusion of ice = 3.3 x 10^(5) J/kg, temperature of water = 100\(^{o} C\).

Q = m (cΔθ + L)

   = 0.02(4200 x (100) + 330000)

   = 0.02(420000 + 330000)

  = 0.02 (750000)

Q = 15000

Q = 15000 Joules

Q = 15KJ

The quantity of heat needed to complete the conversion is 15 KJ.

Answer:

so people cant hack into a device (phone,tablet,computer) & find out where you are & kill you.

Explanation: very useful if you have any devices

Answer:

i did this project where i took two marbles pool noodles and tape then i made a ramp and i saw which marble would go down faster the big marble or the little marble hope this helps!!

Light slows down and somewhat changes direction as it passes through water from air. Refraction is the name for this shift in direction.

Light "bends" more in the direction of the normal line when it enters a denser substance (one with a higher refractive index). Some light is reflected off of water when light that is going through the air collides with it. The remaining light enters the water and travels through it, but it bends (or refracts) as it does so. When light strikes glass or any other transparent substance, the same thing occurs. Air is lighter and thinner than glass and water. It is claimed that they are "denser" than air. Light slows down when it transitions from less dense air into denser glass or water.

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Explanation:

to have no one hear you and you can hear them... ex. noise-cancelling room

The reason you have to keep running your engine when your car is moving at a constant velocity on the highway is to overcome frictional forces.

So, the correct answer is C.

When your car is moving along the highway at a constant velocity, the net force acting on it is zero. However, you still need to keep running your engine to overcome the frictional forces acting on your car.

Frictional forces such as air resistance, rolling resistance, and the resistance caused by the engine and transmission of your car all act against the motion of your car.

Therefore, your engine needs to continue to produce power to counteract these forces and maintain your car's speed.

Additionally, keeping your engine running is important to power essential features of your car, such as your radio and air conditioning, and to prepare for sudden acceleration needs, such as when merging onto a highway or passing another vehicle.

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Answer: Half of an object's mass (1/2*m) multiplied by the velocity squared

Explanation:

In classical mechanics, kinetic energy (KE) is equal to half of an object's mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s2.  

Hope this helps! <3

Answer:1m

Explanation:

2n=0.4m

5n=?

5n×0.4/2n=1m

Answer:

As the number of protons in the nucleus increases, the electronegativity or attraction will increase. Therefore electronegativity increases from left to right in a row in the periodic table

Explanation:

Answer:

I don't know if these are all right but these are my best answers. good luck and I hope you do well.

1. true

2. true

3. false

4. true

5. true

6. true

7. true

8. true

9. false

10. false

13. it stimulates the heart through chest compressions

14. on bare skin upper right shoulder and lower left ribs

15. no CPR

Explanation:

"The angle formed by a body segment with respect to horizontal is the relative angle. Thus, the correct option is A. relative angle.

A relative angle is a measure of the angle between two segments, one of which is the distal segment, and the other of which is the proximal segment. It's used in a variety of fields, including physical therapy, kinesiology, and biomechanics. The relative angle is the difference between the angles of the two segments' orientations. The angle is known as the relative angle because it is determined by comparing two angles to one another instead of comparing an angle to a set horizontal or vertical line. It's frequently employed to assess joint motion in physical therapy, kinesiology, and biomechanics, among other fields.

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If you have two points in an electric field, one at point "ua" and one at the origin (or "uo"), the potential energy at point "ua" will be larger than the potential energy at the origin.

The electric potential energy at a point in an electric field is defined as the amount of work required to move a point charge from the origin to that point. The electric potential energy increases as you move away from the origin in the direction of the electric field.

Therefore, if you have two points in an electric field, one at point "ua" and one at the origin (or "uo"), the potential energy at point "ua" will be larger than the potential energy at the origin. This is because it takes more work to move a point charge from the origin to point "ua" than it does to move it from the origin to the origin.

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Answer:

9 900 000 000 000 km = 9 900 000 000 000 000 m

Explanation:

9 900 000 000 000 * 1000