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Answer:

v' = -18 m/s

Explanation:

       \(p_{o} = p_{f} (1)\)

       \(m_{b} * v_{b} -M_{c}*V_{c} = m_{b} * 18 m/s + (-M_{c}* 20 m/s) (2)\)

        \(-(m_{b} * v'_{b}) + M_{c}*V'_{c} (3)\)

       \(-(m_{b} * v'_{b}) +(- M_{c}*V_{c}) = -(m_{b} * v'_{b}) + (-M_{c} * 20 m/s) (4)\)

       \(m_{b} * 18 m/s + (-M_{c}* 20 m/s) = -(m_{b} * v'_{b}) + (-M_{c} * 20 m/s) (5)\)

If a particle's velocity is nonzero, then its acceleration can be zero, because acceleration is the rate of change of velocity. If the velocity is constant and does not change, the acceleration is zero.

The rate of change of an object's velocity with respect to time is defined as acceleration. Vector quantities are accelerations. The orientation of an object's acceleration is determined by the orientation of its net force.

Because velocity is both a speed and a direction, there are only two ways to accelerate: modify your speed or your direction—or both.

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90.1 g of ice are still present in the container. Calculating the heat received by the ice to melt and the heat lost by the tea is necessary until it reaches an equilibrium temperature of 33.1 ◦C .

Consider how much energy is required to melt one kilogramme of ice at zero degrees to produce one kilogramme of water at zero degrees. The energy required to melt one kilogramme of ice is determined by Q = mLf = (1.0 kg)(334 kJ/kg) = 334 kJ using the equation for a change in temperature.

In order to calculate how much heat is gained by the ice melting, we must first calculate how much heat is lost by the tea as it cools from 33.1 °C to 0.0 °C.

Tea loses the following amount of heat: q1 = m1CT1 = 0.185 kg) (4186 J/kg C) (33.1 C - 0.0 C) = 26298.93 J.

Heat required for ice to melt is given by the formula: q2 = m2Hf = (0.0903 kg)(333.55 kJ/kg) = 30062.56 J

We may set q1 = q2 to get the mass of ice still present because the system is in thermal equilibrium:

m2 = q2/Hf = 333.55 kJ/kg / 30062.56 J = 0.0901 kg

Finally, we round the mass to two significant digits and convert it to grammes:

m2 = 90.1 g

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The energy that is needed to turn the water into a gas is called the latent heat of vaporization.

Latent heat of vaporization is the heat capacity or energy that is needed to turn the water in liquid state into a gas without any rise or change in temperature of the water.

Mathematically, the formula for the energy that is needed to turn the water into a gas is given as;

Q = mLv

where;

Thus, the three words needed to complete the sentence are  heat of vaporization.

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The work done by the teacher can be calculated using the equation:

work = force x distance x cos(θ)

Here, the force is 10 N, the distance is 20 feet (converted to meters) and the angle between the direction of force and distance is 0 degrees, so cos(0) = 1.

So, work = 10 N x 20 feet x 0.3048 m/foot x 1 = 60.96 J

The teacher did 60.96 joules of work.

From the map showing the route traveled by a school bus, the total displacement of the school bus from the start to the end of its trip is 800 m.

Displacement is a vector quantity. That means that is calculating to total displacement of the bus we must take into account, the direction of the displacement.

Recall that we add vectors in the same direction and subtract vectors in opposite direction.

Hence, the total displacement is; 400 m + 500 m + 400 m - 500 m = 800m

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Hooke's Law can be given as follows sometimes:

The restoring force of a spring is equal to the spring constant multiplied by the displacement from its normal position:

F = -kx

Where, F = Restoring force of a spring (Newtons, N)

k = Spring constant (N/m)

x = Displacement of the spring (m)

The negative sign relates to the direction of the applied force and by convention, the minus or negative sign is present in F = -kx. The restoring force F is directly proportional to the displacement (x), according to Hooke's law. When the spring is compressed, the displacement (x) is negative. It is zero when the spring is at its original length and positive when the spring is extended.

Practically, Hooke's Law is applicable only within a limited frame of reference, and through experimenting, this statement proves to be true. Because materials cannot be compressed beyond a certain size or expanded beyond a certain size without some permanent deformation or change of their original state.

The law only applies under some conditions such as a limited amount of force or deformation. Factually, many materials will noticeably deviate from Hooke's law even before those elastic limits are reached.

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Answer:

physical

Explanation:

it is a real life model that was built

Answer:

E) She can perform no measurement to determine this quantity.

Explanation:

A spacecraft is a machine used to fly in outer space.

According to Isaac Newton's third law of motion, every action produces an equal and opposite reaction. When fuel is shoot out of one end of the rocket, the rocket moves forward for which no air is required.

As Leah is moving in a spaceship at a constant velocity away from a group of stars, she cannot measure to determine this quantity.

Answer:

b. inertia

Explanation:

BECAUSE OF THEIR inertia A PAIR OF SUNGLEASSES ON THE DASHBOARD WILL CONTINUE MOVING FORWARD WHEN THE CAR TURNS SHARPLY.

The radiation that is least damaging to humans is non-ionizing radiation.

Non-ionizing radiation refers to the type of radiation that does not have enough energy to remove tightly bound electrons from atoms or molecules, thus not causing significant damage to biological tissues.

Examples of non ionizing radiation include radio waves, microwaves, visible light  and low energy ultraviolet (UV) radiation. while excessive exposure to any form of radiation can have adverse effects, non-ionizing radiation is generally considered to be less harmful compared to ionizing radiation, which includes X-rays and gamma rays.

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Determine the magnitude of B-A is 53.68

1.4

Magnitude is a term used to describe size or distance. We can relate the magnitude of the movement to the size and movement speed of the object. The magnitude of a thing or an amount is its size. A car moves at a faster pace than a motorcycle, just in terms of speed.

Magnitude is the relative size of an object (mathematics). The mathematical term for a vector's length or size is the norm. By using the symbol |v|, the magnitude of a vector formula can be utilized to determine the length of a given vector (let's say v). This amount is essentially the distance between the vector's beginning point and ending point.

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Magnetic particle separation is a powerful tool for separating particles based on their velocities in a magnetic field, and it has significant practical applications in various scientific and technological fields.

To separate particles of different velocities moving in a magnetic field, one can utilize a technique called magnetic field separation or magnetic particle separation.

This method takes advantage of the fact that charged particles moving in a magnetic field experience a force called the Lorentz force, which acts perpendicular to both the velocity vector and the magnetic field.

The basic principle behind magnetic particle separation is to apply a magnetic field perpendicular to the motion of the particles. The Lorentz force will then cause the particles to curve in different directions based on their velocities and charges.

By carefully controlling the strength and direction of the magnetic field, particles with different velocities can be steered onto different paths and separated.

One common approach to achieve magnetic particle separation is to use a device called a magnetic separator. This device typically consists of a strong magnet or a series of magnets arranged to create a uniform magnetic field.

The particles to be separated are injected into a chamber or a flow system where the magnetic field is applied. As the particles move through the magnetic field, they experience the Lorentz force and deviate from their original trajectory. The degree of deviation depends on their velocity and charge.

By carefully adjusting the magnetic field strength, particle size, and other parameters, it is possible to optimize the separation process and achieve effective separation of particles with different velocities. This technique has various applications in fields such as biomedical research, environmental monitoring, and materials science.

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a) The value of t u = 140/t`b.

b) The y position of the cannonball at the time t is  55.5 mc.

c) The initial speed of the projectile is 52.4 m/s.

Given that a cannonball is fired horizontally from the top of a cliff. The cannon is at height H = 55.5 m above ground level, and the ball is fired with initial horizontal speed u. The projectile lands at a distance D = 140 m from the cliff. Assume that the cannon is fired at time t = 0 and that the cannonball hits the ground at time t.Now,We have to find the value of t, y position of the cannonball at the time t and the initial speed of the projectile.

a. To find the value of t:Here, we have to use the formula of distance

i.e.,S = ut + (1/2)gt², Where S = 140 m, u = u and g = 9.8 m/s².Hence,140 = u×t ………..(1)We know that, time taken by the cannonball to hit the ground can be calculated as,`(2H)/g`

Since the height of the cannon from the ground is 55.5m, the total height of the cannonball from the ground is

(2H) = 2 × 55.5

= 111 m`2H/g

= 111/9.8`

= 11.32653 s

From equation (1),u×t = 140u = 140/t

Therefore, `u = 140/t`b.

b)To find the y position of the cannonball at the time t:

Here, we have to use the formula of height i.e.,y = u×t – (1/2)gt²,

Where, y = height of the cannonball at time t, u = 140/t, t = time taken by the cannonball to hit the ground and g = 9.8 m/s².

We have already calculated the time taken by the cannonball to hit the ground in the previous step.`

y = 140 - (1/2) × 9.8 × t²`

On substituting the value of t as `t = 11.32653`,

we get,y = 140 - (1/2) × 9.8 × (11.32653)²= 55.5 mc.

c)  To find the initial speed of the projectile:

To calculate the initial speed of the projectile, we need to use the formula of range of projectile

.i.e.,R = u²sin2θ/g

Where R = 140 m, g = 9.8 m/s², θ = 0° (horizontal)

u² = R × g/sin2θ

   = 140 × 9.8/sin0°  

   = 2744m²/s²u  

   = \(\sqrt(2744m^2/s^2)\)

   = 52.4 m/s

Hence, the initial speed of the projectile is 52.4 m/s.

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The displacement can be zero if starting point and end point of the distance travelled is the same that is the point we started our journey from is the same point we end our journey.

What is displacement?

How it is represented?

Displacement is represented by an arrow between the starting point and end point. That is distance between initial position to final position, here, initial point is the starting point and the final point is the end point.

For example, you start from a point and takes a semi circular path towards the stationary shop which is right in front of the start point you took time of 10 minutes. So the travelled path here will be the distance but if instead of taking that long route of semi circular path, if you take the straight road and reach the shop within 3 minutes, then this shortest travelled path will be the displacement.

How can displacement be zero?

For example, a person while running on a circular track will start running from a point but will end at the same point. Thus, this person will have the distance travelled as the circumference of the track but displacement is zero.

As for another example, if we start our journey from our home to a stationary shop and the shop happens to be close then without any stoppage in between you come back to your home.

In this case also, the starting point is the final point. Hence, no displacement or zero displacement.

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Answer:

We dont have a understandable Ansewer for this

Explanation:

1) There are many handwriting characteristics that are used to identify forgeries, including line quality, pen pressure, slope, letter size and shape, and more.

Pressure is a physical force that is exerted on an object or area by another object or area. It is measured in terms of force per unit area and can be calculated using the formula: pressure = force/area. Pressure is an important factor in many areas of science, engineering, and everyday life.

2) Checks have embedded features such as watermarks, microprinting, and holograms to prevent forgery.

3) True. A person's handwriting is compared to several exemplars to determine if the handwriting is genuine or a forgery.

4) True. Some forgers use chemicals to age paper to make it appear older than it is.

5) The U.S. Department of the Treasury is charged with the security of U.S. currency.

6) False. People often spend time forging documents from famous people in order to make money.

7) U.S. currency has many security features, including watermarks, color-shifting ink, invisible fibers, and microprinting.

8) The main difference between check forgery and literary forgery is that check forgery is primarily concerned with creating or altering a financial document, while literary forgery is primarily concerned with creating or altering a work of literature.

9) Criminals make forged literary pieces look older by using aging techniques such as adding age spots

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The acceleration on a body of mass 2kg with a force of 25N is 12.5 m/s^2

Given Data

We know that the expression for the Relationship between force acceleration and Mass is given as

F = ma----------------1

Substituting our given data into the expression we have

25 = 2*a

Making acceleration the subject of the formula we have

a = 25/2

a = 12.5 m/s^2

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Answer: The scenario violates the second law of thermodynamics.

Explanation: The second law states that heat cannot be converted into work without some loss of usable energy, and that the amount of usable energy in a closed system will always decrease over time. Therefore, the machine described in the scenario cannot exist because it would violate the second law by converting all of the heat into electricity without any loss of usable energy.

If the ball is rolling along a straight path, its average speed is 0.2 meters per second.

Average speed is a measure of distance traveled over time. It is calculated by dividing the total distance traveled by the total time taken to travel that distance. Average speed can be measured in miles per hour (mph), kilometers per hour (kph), or other units of speed. Average speed is a useful measure when comparing the speed of different objects or for analyzing the speed of an object over a period of time. Average speed can also be used to measure the efficiency of a journey, such as the time taken to reach a destination.

Speed is described as
Distance x time  speed
The graph indicates that the ball is 10 meters away and that the time is 50 seconds.
Therefore, Speed = 10m/50s = 0.2m/s.

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Complete Question:
The graph below shows the motion of a ball rolling on a straight track. What was the ball's average speed during the time represented in the graph?

Explanation:

First, the liquid on the bottom of the pot closest to the heat source starts to get hot; as it does, it rises. The rising hot water is replaced by the cooler, more dense water molecules. The water molecules in your pot continually exchange in this way, thanks to gravity, eventually warming the entire pot of liquid.

If a third resistor is added in SERIES, what changes happens to the....

When you add a third resistor in series, the total resistance of the circuit increases. This is because the current has to flow through all three resistors, so it has to overcome more resistance. The total voltage across the circuit stays the same, because the voltage of the battery is constant. However, the current decreases, because the same amount of current is now flowing through a larger resistance.

The voltage across each resistor also decreases, because the total voltage is divided among the three resistors. The current through each resistor also decreases, because the same current is now flowing through a larger resistance.

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Answer:

15 000 N

Explanation:

Newtons Law 2. When a body is acted upon by a force, the time rate of change of its momentum equals the force.

F=ma

a=30m/s / 3s=10m/c²

F=1500kg*10m/c²=15 000 N

The approximate number of taste buds that humans have is 10,000 (option C).

Tastebuds are any of the small organs on the tongue used for tasting.

Taste buds are cells on the tongue that allow one to perceive tastes, including sweet, salty, sour, bitter and umami.

Taste buds regenerate approximately every 10 days, which means injured taste buds usually repair on their own. The average adult human has between 2000 and 8000 tastebuds.

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Answer:

Different wavelengths of microwaves (grouped into "sub-bands") provide different information to scientists. Medium-length (C-band) microwaves penetrate through clouds, dust, smoke, snow, and rain to reveal the Earth's surface.

Answer:

1.2

Explanation:

took the test

Option d: An outlier in a scientific graph represents an inaccuracy in the experiment. is not a part of the best-fit line or curve.

An experiment is a systematic process of testing a hypothesis or verifying a theory. It is a fundamental part of the scientific method, which involves making observations, gathering data, and analyzing results to draw conclusions. Experiments can be performed in a wide range of fields, from physics and chemistry to biology and psychology.

The design of an experiment is crucial in ensuring reliable results. It involves defining the variables, selecting the appropriate measurements and instruments, and establishing a control group to eliminate confounding factors. Proper documentation and communication of experimental procedures and results are also important for the scientific community to evaluate and replicate the study.

Experiments can have numerous applications, including developing new technologies, testing the efficacy of medications, and exploring the natural world. They can also lead to unexpected discoveries, challenge existing theories, and provide insights into the underlying mechanisms of natural phenomena. Overall, experiments play a vital role in advancing scientific knowledge and improving our understanding of the world around us.

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The magnitude of the force P provided that the stress in the part AB is two times that of BC part is 0.8 kN.

The magnitude of the force P provided that the stress in the part AB is two times that of BC part is calculated as follows;

Take moment about the joint to determine the magnitude of the force along part BC.

120 kN x 750 mm  =  F x 1000 mm

F = ( 120 kN x 750 mm ) / ( 1000 mm )

F = 90 kN

Stress is given as force divided by area. The following equation can be used to determine the magnitude of force P.

Stress in AB = 2 times stress in BC

P/A₁  = 2F/A₂

where;

A₁ =  πd²/4  =  π(50 x 10⁻³)²/4

A₁ = 1.96 x 10⁻⁵ m²

A₂ = πd²/4  =  π(75 x 10⁻³)²/4

A₂ = 4.42 x 10⁻³ m²

P/A₁ = 2F/A₂

P = (2F x A₁) / (A₂)

P = (2 x 90 kN x 1.96 x 10⁻⁵ m² ) / ( 4.42 x 10⁻³ m² )

P = (2 x 90,000 N x 1.96 x 10⁻⁵ m² ) / ( 4.42 x 10⁻³ m² )

P = 798.2 N

P = 0.798 kN

P ≈ 0.8 kN

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