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Answer:

a. {v_{x}} = 10.8 m/s, {v_{y}} = -5.01 m/s

Explanation:

The initial velocity components are

Horizontal 11.9cos24.9 = 10.8 m/s

Vertical     11.9sin24.9 = 5.01 m/s    (where up is assumed positive)

In the absence of air resistance, the horizontal velocity will remain unchanged and, assuming the ground is horizontal, the vertical velocity will have completely reversed directions.

The specific heat of the metal, assuming no heat is exchanged with the surroundings is 2140 J/(kg•K).

The specific heat capacity of the metal is determined from the principle of conservation of energy.

energy lost by the metal = energy gained by aluminum + energy gained by water

Q = mcΔθ

where;

0.425c(100 - 40) = 0.1(900)(40 - 15) + 0.5(4186)(40 - 15)

25.5c = 2250 + 52,325

c = 54,575/25.5

c = 2140 J/(kg•K)

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it is 6 squares count up how many you find 6

If you jump on the scale from a height of 1.9 m, the scale will read 7160 N at its peak.

When you jump on the scale, your weight and the force of your impact are both applied to the spring inside the scale. At its peak, the scale will read the sum of these two forces.

To calculate the force of your impact, we can use the principle of conservation of energy. When you jump from a height of 1.9 m, you convert potential energy into kinetic energy, given by:

mgh = (1/2)mv^2

where;

Solving for v, we get:

v = √(2gh)

Substituting the values, we get:

v = √(2 x 9.81 m/s^2 x 1.9 m) = 6.46 m/s

Now, the force of your impact on the scale is given by:

F = ma

where;

Assuming that the duration of the impact is very short, we can use the impulse-momentum theorem, which states that the change in momentum of an object is equal to the impulse applied to it. The impulse is given by:

J = Ft

where;

The change in momentum of your body is:

p = mv - 0

where;

Since the momentum is conserved, we have:

mv = Ft

Solving for F, we get:

F = mv/t

Substituting the values, we get:

F = (m x 6.46 m/s) / (0.001 s) = 6460 N

Therefore, the scale will read:

700 N + 6460 N = 7160 N

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Answer:

Its either A. Or C cause ive had a question like this before So Im sure But if not Then Im so sorry

Answer:

after it has hit the ground

.........

Answer: A. after it has hit the ground

Resistivity is the resistance between opposite faces of a unit cube.

The electrical resistance of a conductor with a unit cross-sectional area and unit length is called resistivity. Resistivity is a distinctive attribute of any material that may be used to compare different materials based on how well they conduct electric currents. Low conductivity is indicated by high resistance.

The Greek letter rho is frequently used to represent resistance, which is numerically equivalent to the resistance R of a wire-like specimen, multiplied by its cross-sectional area A, and divided by its length l; RA/l. The ohm is the measurement of resistance. Units of ohm-centimeter can be used to represent resistance when lengths are measured in centimeters. The temperature of the material also affects the value of resistivity.

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The statement "B. Gravity exists only on Earth" and the statement "E. Gravity doesn't exist between Earth and the sun"  is not true about gravity.

Gravity is a fundamental force of nature that exists in the whole universe, not just on Earth. It is a force that acts between any two objects that have mass. This means that statement "C. Gravity is a force that pulls two objects together" and "D. Gravity exists between two objects that have mass" are both true. Gravity plays a significant role in the functioning of our solar system. The sun's gravitational force acts on the planets, including Earth, keeping them in their orbits. Similarly, Earth's gravitational force attracts objects towards its center, giving weight to objects on its surface. Gravity is the force that holds Earth in orbit around the sun and is responsible for the planets' motion in the solar system. Gravity is a universal force that exists throughout the universe, acts between objects with mass, and plays a crucial role in celestial bodies' movements, including the interaction between Earth and the sun.

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Since the car masses are unknown, we are unable to calculate the numerical value of the x-component of Car A's tangential acceleration.

The energy that is held in any object or system as a function of its position or component arrangement is known as potential energy. The object or system is unaffected by external factors like air pressure or altitude. Kinetic energy, on the other hand, describes the power of moving particles within a system or an object.

They are being affected by the kinetic frictional force, which is caused by:

f = μk * N

Therefore,

fB = μk * N = μk * mB * g

Car C is at its highest point at the top of the hill, where the normal force acting on it is equal to the force of gravity. Therefore,

fC = μk * N = μk * mC * g

where mC is the mass of Car C.

For Car A, the x-component of the tangential acceleration is given by:

aA = (fB - fC) / mA

where mA is the mass of Car A.

We can substitute the following values and simplify by assuming that the mass of each of the three automobiles is the same:

aA = (μk * mB * g - μk * mC * g) / mA

aA = μk * g * (mB - mC) / mA

Since μk = 1.00 and g = 9.81 m/s², we can plug in the values and get:

aA = (mB - mC) * 9.81 / mA

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The apparatus that can used to measure the mass of the wooden block​ by the student is called beam balance.

A beam balance, often referred to as a double-pan balance, is a straightforward tool for determining an object's weight. Two pans or trays are hung from either end of a horizontal beam that is suspended from a pivot point in the middle.

The thing to be weighed is put on one tray, and then the second tray is filled with standard weights until it balances, showing the weight of the object. From little ones used in laboratories to larger ones used in enterprises, beam balances can be found in a variety of shapes and sizes. Because they are precise and operate without electricity or batteries, they are widely used.

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Answer:

\(-3 m/s^{2}\)

Explanation:

Acceleration on a VT graph is the slope of the line at the given point. We can find the slope at 3 with Δy/Δx. This gives us (4-2)/(3-(-3)) which works out to be -3m/s^2

Nuclear power plants have backup generators to ensure that essential equipment, such as cooling systems, can continue to function in the event of a power outage or other emergency.

Nuclear power plants rely on a constant supply of electricity to operate the equipment that controls the nuclear reaction and cools the reactor. If the power supply is interrupted, the reactor can overheat and damage can occur. Backup generators provide power to essential equipment, such as cooling systems, that keep the reactor and spent fuel pools from overheating.  If the backup generators fail, there is a risk of a nuclear accident, as was seen in the disaster in 2011, where the failure of backup generators led to a loss of cooling and a major nuclear incident.

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Answer:

The raft moves towards the shore

Explanation:

The heat pump is a mechanism that transfers heat from an area to another area.

It can do this using compression and expansion of a gas, which is used to ransfer the heat.

Analyzing the options, the last three ones are true statements about heat pumps, but the first one is false, because heat pumps need work to perform the compression of the gas.

Therefore the corect answer is A.

Explanation:

ACCELERATION IS THE RATE OF CHANGE OF VELOCITY

i.e a = ΔV/ Δt where ΔV is final velocity – initial velocity and Δt is t final – t initial

a = (45–15)/5= 6 km/s²

The average acceleration of the car during these 5 seconds = a =  6 km/s^2

Average acceleration refers to the rate of change of velocity for that interval per time

given

v(initial) = 15 km/s

v( final ) = 45 km/s

time interval = 5 seconds

a (average acceleration) = (v( final ) - v(initial))  / time interval

a = (45 - 15) / 5

a =  6 km/s^2

average acceleration of the car during these 5 seconds = a =  6 km/s^2

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Just flip one of the batteries to connect one's positive terminal to others negative terminal.

To determine the magnitude of the lift force ⃗ and the force of air resistance ⃗ acting on the jet, we need to resolve the weight ⃗ and the forward thrust ⃗ into their horizontal and vertical components.

The weight ⃗ can be resolved into two components:

- the vertical component, Wsin(30°), acting downward

- the horizontal component, Wcos(30°), acting to the left

The forward thrust ⃗ can also be resolved into two components:

- the vertical component, Tsin(30°), acting upward

- the horizontal component, Tcos(30°), acting to the right

Since the jet is flying at a constant speed, the lift force ⃗ must be equal in magnitude to the weight component acting downward, Wsin(30°). Therefore, the magnitude of ⃗ is 86,500 Nsin(30°) = 43,250 N.

The force of air resistance ⃗ is equal in magnitude to the horizontal component of the weight, Wcos(30°), minus the horizontal component of the forward thrust, Tcos(30°). Therefore, the magnitude of ⃗ is (86,500 Ncos(30°)) - (103,000 Ncos(30°)) = -8,715 N, where the negative sign indicates that the force of air resistance is acting in the opposite direction to the motion of the jet.

Therefore, the magnitude of the lift force ⃗ is 43,250 N and the magnitude of the force of air resistance ⃗ is 8,715 N.

Vehicles need to be serviced for several reasons such as preventing costly repairs and improving fuel economy.

First, regular maintenance can help to prevent costly repairs down the road. Second, maintenance can help to improve fuel economy and emissions. Third, maintenance can help to keep your vehicle safe and reliable.

The servicing requirements for petrol/diesel and electric vehicles differ in a number of ways. Petrol/diesel vehicles require oil changes more frequently than electric vehicles. This is because petrol/diesel engines use oil to lubricate the moving parts, while electric motors do not. Petrol/diesel vehicles also require tune-ups more frequently than electric vehicles.

This is because petrol/diesel engines have more moving parts that need to be synchronized, while electric motors have fewer moving parts.

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A) Point A is the one with the highest potential.

B) The uniform electric field's magnitude E is equal to 1033.33 V/m.

Given that,

Potential difference at point A ( at x ) = 0.6 m

Potential difference at point B ( at x ) = 0.9 m

Potential difference = 310 volts

Point charge is -0.200 μC = - 0.2 * 10⁻⁶ C

A) The point with a larger potential is point A because the uniform electric field of magnitude (E) is not close to the positive charge and is farther away from point B by 0.9 m. This is because the uniform electric field is directed in the negative x direction. Additionally, the square of the distance from a point charge has an inverse relationship with the potential difference of an electric field.

B) In order to determine the size (E) of the uniform electric field:

The equation Vab = E* d determines the magnitude (E) of this electric field at a constant potential difference.

Where Vab is the potential difference between points A and B, and E is the uniform electric field's magnitude

E is the electric field's strength, and d is the separation between points A and B.

Let us determine the distance (d),

d = db - da

⇒ 0.9 - 0.6 = 0.3 m

By changing the values in the formula above, we arrive at

310 = 0.3 E

E = 1033.33 V/m

Therefore, the uniform electric field has a magnitude of 1033.33 V/m.

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The object's speed shortly before it lands on the earth is 40 m/s.

The speed at which something moves in a specific direction is known as its velocity. as the speed of a car driving north on a highway or the pace at which a rocket takes off. Because the velocity vector is scalar, its absolute value magnitude will always equal the motion's speed.

The parameters are as follows: the pebble's time, t = 4 s; the object's velocity right before impact;

The kinematic equation is as follows;

v = in which

v = 0+10 (4)

The object's speed right before impact with the earth is v = 40 m/s2, where g is the acceleration caused by gravity and an is a constant of 10 m/s2. As a result,

the object's final velocity before impact is 40 m/s.

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Complete question:

A dragster starts from rest and accelerates at 35 m/s2 m / s 2 . How fast is it going after 7s.

Answer:

The final velocity of the dragster is 245 m/s.

Explanation:

Given;

acceleration of the dragster, a = 35 m/s²

initial velocity of the dragster, u = 0

time of motion, t = 7 s

the final velocity of the dragster after 7s is given by;

v = u + at

where;

v is the final velocity

u is the initial velocity

v = 0 + (35 x 7)

v = 245 m/s

Therefore, the final velocity of the dragster is 245 m/s.

The front of the truck is designed to crumple during a collision to absorb the impact energy, slow down the collision, and protect the well-being of the passengers. This design feature helps increase the collision time, reduce the forces acting on the passengers, and minimize the risk of severe injuries.

Danica observes a collision between two vehicles. She sees a large truck driving down the road. It strikes a small car parked at the side of the road. On colliding, the truck applies a force on the stationary car, and the stationary car applies an opposite force on the truck. The front of the truck is designed to crumple in order to absorb the impact energy and slow down the collision , which protects the well-being of the passengers.

During a collision, the principle of Newton's third law of motion comes into play. According to this law, for every action, there is an equal and opposite reaction. In the case of the collision between the truck and the car, the truck exerts a force on the car, pushing it forward, while simultaneously experiencing an equal and opposite force from the car.

The purpose of designing the front of the truck to crumple is to increase the collision time and absorb the kinetic energy. When the truck collides with the stationary car, the front of the truck deforms, crumples, and absorbs a significant amount of the impact energy. This process increases the time over which the collision occurs, reducing the forces acting on the passengers and minimizing the risk of severe injuries.

By allowing the truck to crumple, the kinetic energy of the collision is transformed into other forms, such as deformation energy and heat. This energy transformation helps protect the passengers by reducing the deceleration forces acting on them. It also helps prevent the transfer of excessive forces to the car's occupants and reduces the likelihood of severe injuries.

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Answer:

so initial momentum is 0.22kgm/s

Explanation:

m1=0.20kg

m2=0.30kg

initial velocity of m1=u1=0.50m/s

initial velocity of m2=u2=0.40m/s

total momentum of the system before collision

Pi=m1u1+m2u2

Pi=0.20kg×0.50m/s+0.30kg×0.40m/s

Pi=0.1kgm/s+0.12kgm/s

Pi=0.22kgm/s

The total momentum of the gliders before the collision, with masses 0.20 kg and 0.30 kg, respectively, and initial velocities of 0.50 m/s and 0.40 m/s, respectively is -0.02 kg*m/s.  

Before the collision, the first glider is heading in the positive direction (to the right) and the second glider is moving in the negative direction (to the left).  

The total momentum before the collision is given by:

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

Where:

m₁: is the mass of the first glider = 0.20 kg

m₂: is the mass of the second glider = 0.30 kg

v₁: is the velocity of the first glider = 0.50 m/s

v₂: is the velocity of the second glider = -0.40 m/s (minus sign because the glider is in the negative direction)

Then, the total momentum before the collision is:  

\( p_{i} = (0.20*0.50 - 0.30*0.40) kg*m/s = -0.02 kg*m/s \)

Therefore, the total momentum of the gliders before the collision is -0.02 kg*m/s.

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Answer:

by giving a person to person

Answer:

The correct answer is B. Energy cannot be created or destroyed.

The law of conservation of energy states that energy cannot be created or destroyed, but it can be transformed from one form to another. This means that in any physical process, the total amount of energy in a system remains constant. Energy can be converted from one form to another, such as from kinetic energy to potential energy or from electrical energy to light energy, but the total amount of energy in the system remains the same.

To determine the thrust applied by the engines, we can use Newton's second law of motion, which states that force (thrust) is equal to mass times acceleration. In this case, we need to calculate the force required to decelerate the plane from 30 m/s to 25 m/s in 12 seconds.

First, we calculate the change in velocity (∆v):

\(\displaystyle\sf \Delta v=25\,m/s-30\,m/s=-5\,m/s\)

Next, we calculate the acceleration (∆a) using the formula:

\(\displaystyle\sf \Delta a=\frac{\Delta v}{\Delta t}\)

where ∆t is the change in time, which is 12 seconds in this case.

\(\displaystyle\sf \Delta a=\frac{-5\,m/s}{12\,s}\)

Now, we can determine the force (thrust) applied by the engines using Newton's second law:

\(\displaystyle\sf F=m\cdot a\)

where m is the mass of the airplane, which is 480000 kg.

\(\displaystyle\sf F=480000\,kg\cdot \left(\frac{-5\,m/s}{12\,s}\right)\)

Calculating the result:

\(\displaystyle\sf F=-200000\,N\)

Therefore, the engines applied a thrust of -200000 Newtons (N) to decelerate the plane. The negative sign indicates that the thrust is in the opposite direction of the motion.

The current in the series circuit  across a 9.0 V potential difference is determined as 0.333 A.

The current in the series circuit is determined by applying ohms law as shown below;

V = IR

where;

R = 12 Ω  + 15 Ω  = 27 Ω

I = V/R

I = 9/27

I = 0.333 A

Thus, the current in the series circuit  across a 9.0 V potential difference is determined as 0.333 A.

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