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1 Which has the LEAST momentum?
Group of answer choices
a 2 kg ball moving at 8 m/s
a 750 g ball moving at 15 m/s
a 80 kg ball moving at 25m/s
a 12 kg ball moving at 1.25

Speed and velocity are similar in term of their unit. the speed of the jet is 42 m/s

What is Speed ?

Speed can simply be defined as how fast an object moves. It is the distance covered per time taken.

Given that acceleration = 2.8 m/s² and If after take-off, the jet continues to accelerate at the same rate for another 15 s, to know how fast it will be going at that time, we will use acceleration formula.

Acceleration = Velocity / time

speed = acceleration × time

speed = 2.8 × 15

Speed = 42 m/s

Therefore, the speed or the velocity of the jet is 42 m/s

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When the elevator comes to a stop, the supporting cable is held at -3000 N of tension.

A force that is transmitted when a rope, cable, or string is pulled tight is tension. The pulling force that an object exerts on a rope, cable, or string transmits along its length to another object that is attached to the other end is known as tension. The force along the length of a rope or cable that is being stretched or pulled is known as tension in physics.

We must determine the elevator's net force in order to determine the supporting cable's tension. The sum of the elevator's acceleration and mass creates this net force. As a result of the elevator's slowdown in this instance, its acceleration is negative (opposing its velocity).

The elevator's acceleration can be determined using the equation for average acceleration:

where a = (v_f - v_i) / t

The elevator's acceleration is denoted by a, the elevator's final velocity is denoted by v_f, and the initial velocity is denoted by v_i, which is 7.0 m/s. The time interval is denoted by t, which is 3.5 seconds.

a = (0 - 7.0) / 3.5

a = -2.0 m/s²

The net force on the elevator is given by the equation:

F_net = m × a

where:

F_net is the net force on the elevator

m is the mass of the elevator (1500 kg)

a is the acceleration of the elevator (-2.0 m/s²)

Substituting the values:

F_net = 1500 × -2.0

F_net = -3000 N

Since the cable is the only force , the tension (T) in the cable must be equal to the net force:

T = F_net

T = -3000 N

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Answer:

I think d or b maybe it's d

The rocket's height when it was initially launched is 311 meters above sea level.

The rocket's height, in meters above sea level, is described by the equation h = -4.9t^2 + 286t + 311. To determine the rocket's height after 7 seconds, we substitute t = 7 into the equation and solve for h. Additionally, to find the height when the rocket was initially launched, we substitute t = 0 into the equation and calculate h.

To find the rocket's height after 7 seconds, we substitute t = 7 into the equation h = -4.9t^2 + 286t + 311:

h = -4.9(7)^2 + 286(7) + 311

h = -4.9(49) + 2002 + 311

h = -240.1 + 2002 + 311

h = 2072.9 meters

Therefore, the rocket's height after 7 seconds is 2072.9 meters above sea level.

To determine the height when the rocket was initially launched, we substitute t = 0 into the equation:

h = -4.9(0)^2 + 286(0) + 311

h = 0 + 0 + 311

h = 311 meters

Hence, the rocket's height when it was initially launched is 311 meters above sea level.

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Answer:

131.2440 N

Explanation:

The net force is calculated by finding the resultant between Fb and Fa. This is done by taking the square root of Fb squared plus Fa squared.

\(Fnet=\sqrt{Fb^{2} +Fa^{2} } =\sqrt{85N^{2} +100N^{2} } =\sqrt{7225+10000}=\sqrt{ 17225}\)

\(Fnet=131.2440 N\)

The net force acting on the object is 815.76N. This force is required to maintain the object's circular motion, as it is always directed towards the center of the circle.

The net force acting on a 53kg object that is moving in a circle of radius 1.7m with a velocity of 14m/s is known as the centripetal force.

Centripetal force is given by the formula

Fₐ= mv^2/r, where m is the mass of the object, v is the velocity of the object and r is the radius of the circle.

Substituting the given values in the formula, we get

Fₐ= (53kg)(14m/s)^2/1.7m = 815.76N.

It should be noted that this force does not affect the magnitude of the object's velocity, but rather its direction, keeping it moving in a circular path.

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In a refracting telescope, the distance between the objective and eyepiece lenses satisfies a certain relationship that ensures the image produced by the objective is at infinity and is used as the object for the eyepiece.

A refracting telescope consists of two lenses: the objective lens and the eyepiece lens. The objective lens produces an image of a distant object at its focal point, which is located at a distance f1 from the lens. This image is real and inverted, but it is also very small.

The eyepiece lens is placed in front of this image and produces a magnified virtual image that can be viewed by the observer. The distance between the eyepiece lens and the objective lens is called the tube length.

For the telescope to work properly, the distance between the lenses must satisfy the relationship f2 = f1/ (M-1), where f2 is the focal length of the eyepiece lens, f1 is the focal length of the objective lens, and M is the magnification of the telescope.

This relationship ensures that the image produced by the objective lens is at infinity and is used as the object for the eyepiece. It also ensures that the magnification of the telescope is equal to the ratio of the focal lengths of the two lenses.

In conclusion, the distance between the objective and eyepiece lenses in a refracting telescope satisfies a specific relationship that ensures the image produced by the objective is at infinity and is used as the object for the eyepiece.

This relationship is f2 = f1/(M-1), where f1 and f2 are the focal lengths of the objective and eyepiece lenses, respectively, and M is the magnification of the telescope. This relationship is essential for the proper functioning of the telescope and for producing a magnified, clear image of distant objects.

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If the mixture is thermally isolated from its surroundings, then it, loses thermal energy to the environment outside as it comes to a final temperature. The correct answer is d.

When the sample of lead is placed in the water, heat will flow from the lead to the water until they reach a common final temperature. Since the final temperature will be less than the initial temperature of the lead, heat must have flowed out of the lead into the surroundings, causing the lead to lose thermal energy to the environment outside the system.

Since the mixture is thermally isolated from its surroundings, no thermal energy is exchanged between the system (lead and water) and the environment during the process. However, heat can still flow within the system itself until thermal equilibrium is reached. Option d is correct.

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Answer:

Lookback time explains that the farther away something is, farther in the past we see it. The Sun's light takes about 8 minutes to reach our eyes. So in reality, we see the Sun as it was 8 minutes ago.

Explanation:

The man has approximately 1.564 seconds to get out of the way of the falling cement block.

A cement block falls from rest from a 57.6-meter-high building. When the block is 14.0 meters above the ground, a 2.00-meter-tall man notices it directly above him. To determine how much time the man has to get out of the way, we can use the following kinematic equation:

h = 0.5 * g * t^2
where h is the height the block falls, g is the acceleration due to gravity (9.81 m/s²), and t is the time.
Since the man notices the block when it is 14.0 meters above the ground and he is 2.00 meters tall, the block has to fall an additional 12.0 meters (14.0 - 2.00) to reach him. Now, we can solve for t:
12.0 = 0.5 * 9.81 * t^2
t^2 = (12.0 * 2) / 9.81
t^2 ≈ 2.448
t ≈ √2.448
t ≈ 1.564 seconds
The man has approximately 1.564 seconds to get out of the way of the falling cement block.

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Answer:

2.00

Explanation:

Answersdff:

Explanation:

Answer

100% - double

200% - triple

300% - 4X

For a 300% increase the KE must be 4 time as large

KE2 / KE1 = M V2^2 / M V1^2 = (V1 / V2)^2 = 4

So V2 = 2 V1 for the requested increase

M V2 / M V1 = V2 / V1 = 2

So the momentum would double for a 100% increase

Cutting speed, which is the distance a cutting tool travels in 1 minute, is measured in feet per minute (ft/min).

Cutting speed indicates how fast a metal is removed from the workpiece. Cutting feed focuses on how far the cutting spindle travels across the metal part during one full rotation of the tool.

According to this question, cutting speed is the distance that a point on the circumference of a rotating cutting tool travels in 1 minute.

The measurement of cutting speed is shown as feet per minute or meters per minute (ft/min or m/min) based on the cutting speed velocity.

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Yes, volts and amps are important factors in welding mild steel using short-circuiting transfer and 0.035 (0.9mm) diameter wire.

In short-circuiting transfer, the wire is fed into the joint and touches the base metal, creating a short circuit that results in a small molten droplet at the end of the wire. The current then drops and the droplet solidifies, breaking the short circuit and starting the process over again. This method is typically used for thinner materials.

To determine the appropriate settings for volts and amps, it's important to consider the thickness of the material being welded, the type of shielding gas being used, and the wire diameter. For example, when welding mild steel with 0.035 (0.9mm) diameter wire, a typical set might be 18-20 volts and 100-140 amps.

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Answer: 2 m/s to the right

Explanation:

This is a conservation of momentum question:

p before = p after → m1v1 + m2v2 = m3v3 + m4v4

**Note- if the speed is to the left, plug in a negative v!

5(2) + 3(-3) = 5(-1) + 3(v4) → 1 = -5 + 3v4 → v4 = +2 m/s :)

The horizontal distance (d_forearm) between the elbow and the point where the weight of the forearm acts is known as the center of mass of the forearm.

The center of mass represents the average position of the weight distribution of an object. In the case of the forearm, this point is important in biomechanics as it helps determine the force exerted by the muscles and the stability of the arm during various movements. To find the center of mass, one can use various techniques including mathematical calculations, experimental measurements, and observation of the anatomy.

Generally, the center of mass for the human forearm is located approximately at the midpoint between the elbow and the wrist, making it roughly 50% of the total length of the forearm. However, this location may vary among individuals due to differences in body proportions, muscle mass, and bone density. In summary, the horizontal distance (d_forearm) between the elbow and the point where the weight of the forearm acts is the center of mass, typically located around the midpoint of the forearm, this point plays a significant role in the biomechanics and stability of the arm during various movements.

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False. Type III Portland cement is a high-early-strength cement, which means it gains strength faster in the early stages of curing. However.

the long-term compressive strength of concrete using Type I Portland cement (general-purpose) is generally higher. Type I cement has a slower hydration rate, allowing for more complete and denser hydration of the cement particles over time, resulting in stronger concrete in the long run. So, Type I cement is preferred for applications where long-term strength and durability are critical, such as structural elements in buildings and bridges. Type III Portland cement is a high-early-strength cement, designed for rapid strength development in the early days of concrete curing. However, Type I Portland cement (general-purpose) generally results in higher long-term compressive strength. Type I cement has a slower hydration rate, allowing for more complete and denser hydration over time, leading to stronger and more durable concrete in the long run.

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Answer:

\( \boxed{R = 20\Omega} \)

Given:

Voltage (V)= 6.0 V

Current (I) = 0.3 A

Explanation:

Ohm's law states that voltage is directly proportional to current.

\(V \propto I \: or \: V = IR\)

R is proportionality constant known as Resistance.

So,

\( = > R = \frac{V }{ I} \\ \\ = > R = \frac{6.0}{0.3} \\ \\ = > R = 20\Omega \)

If the voltage is 6.0V and the current 0.3A, then the resistance is 20 ohms.

Ohm's law is a fundamental law of physics that describes the relationship between electric current, voltage, and resistance in a circuit. It states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them.

Mathematically, Ohm's law is expressed as:

I = V/R

where I is the current flowing through the circuit, V is the voltage applied across the circuit, and R is the resistance of the circuit.

This law holds true for a wide range of electrical conductors, including metals, semiconductors, and electrolytes. The law also states that the resistance of a conductor remains constant as long as the temperature, pressure, and other physical factors remain constant.

Ohm's law is an essential principle in the study of electrical circuits and is used to analyze and design circuits for various applications. It is also used in the design of electrical components such as resistors, capacitors, and inductors.

Here in the Question,

To find the resistance, we can use Ohm's Law which states that resistance (R) is equal to the voltage (V) divided by the current (I):

R = V / I

Plugging in the given values, we get:

R = 6.0V / 0.3A

R = 20 ohms

Therefore, the resistance is 20 ohms.

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Digital filters are important in digital signal processing. FIR and IIR filters are two types of digital filters. The main difference between FIR and IIR filters is that FIR filters are known as non-recursive filters, while IIR filters are recursive filters. In this answer, we will explore more about the differences between FIR and IIR filters.

FIR Filters FIR stands for finite impulse response. FIR filters are also called non-recursive filters. In an FIR filter, the output depends only on the current input and the previous inputs. FIR filters are also known as moving average filters. FIR filters have a linear phase response, which makes them useful in audio and image processing. FIR filters have more stable responses compared to IIR filters, which means they are more predictable.

IIR filters are more efficient than FIR filters because they use feedback loops. IIR filters have nonlinear phase responses, which make them useful in signal processing and control systems. IIR filters are less stable than FIR filters, which means they are less predictable.

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To solve this problem, we need to know the speed of sound in the liver. The speed of sound varies depending on the medium it is traveling through. In human tissues, it's typically around 1540 m/s, but it can vary slightly.

Once we have the speed of sound, we can use the formula for distance, which is speed multiplied by time. However, since the sound wave travels to the reflector and back, the time we have is actually twice the time it takes for the sound wave to reach the reflector. Therefore, we need to divide the total time by 2 to get the time it takes for the sound wave to reach the reflector.

Let's use these values to calculate the distance.

The distance from the source to the reflector is approximately 1.54 millimeters (mm).

This is calculated by using the speed of sound in the liver (1540 m/s) and the time it takes for the sound wave to reach the reflector (1 microsecond, which is half of the total time of 2 microseconds). The formula for distance is speed multiplied by time, so the calculation is 1540 m/s * 1 microsecond = 0.00154 meters, or 1.54 mm.

Answer: Echolocation

Explanation:

Given

The Sun is d=150 million kilometers away from Earth.

Light travels at v=3 × 10^5 m/s.

To find

How long does it take for light to reach Earth from the Sun?

Explanation

We know

Time taken is given by

Conclusion

The time taken is D.500 sec

Answer:

20N

Explanation:

newtons 3rd law every action has an equal opposite reaction

I'm not too sure

The fact that all jobs in modern society are connected to other jobs is called division of labor.

We know that work is structured in such a way that jobs are connected. The jobs are split into smaller components and each person only does a small fragment of the that work that is to be done in a give case.

The fact that all jobs in modern society are connected to other jobs is called division of labor.

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Answer:

it would be electromagnetic waves

With the aid of your spectroscope and E = (h*c)/wavelength, you can determine the energy of the emitted light to be 3.97 x 10-19.

mathematical representation The movement v (in the x direction), frequency f, and wavelength of traveling sinusoidal waves are frequently expressed mathematically as follows: where y is the value of the wave at any place x and time t, and A is the wave's amplitude.

The symbol for the wavelength in the SI is typically m, or one metre. The multiples or fractions of something like a meter are also employed for measuring wavelength. Notably, when wavelengths are a significant attribute, exponential powers of 10 are employed. Shorter wavelengths are given as negative exponentials.

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