explain why it is important to keep the weight over the pulley constant ( Newton 's second law)​

To answer this question, we need to use the formula that relates force, mass, and acceleration: F=ma. We can rearrange this formula to solve for acceleration: a=F/m.

In this case, we are given that the force applied by the motor is 13.9N, and we need to find the velocity at which it will pull a mass. We are not given the mass directly, but we can calculate it using the power of the motor (300W) and the velocity we are trying to find.

Power is defined as the rate at which work is done, or P=W/t, where W is the work done and t is the time it takes to do that work. In this case, we can assume that the work done is moving the mass a certain distance, and we can use the velocity to calculate the time it takes to do that work. So, we have:

P=Fv

where P=300W, F=13.9N, and v is the velocity we want to find. Rearranging this equation gives:

v=P/F

Now we can substitute in the values for P and F to get:

v=300/13.9

v≈21.6 m/s

So, at a velocity of 21.6 m/s, a 300.W motor applying a force of 13.9N can pull a mass.

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12100 m is altitude must he begin to pull out of the dive to avoid crashing into the sea

Data given us that,

Velocity = 330 m/s

Acceleration = 9.0g s

centripetal acceleration

a=v^2/r

r=v^2/a

v = velocity

r = altitude

a = acceleration

Put the value

r=108900/9

r=12100 m

Gravity has an impact on how the missile moves vertically. As a result, the vertical component of the starting speed will be 0 at the highest altitude point. The projectile will slow down as it ascends to its highest point, come to a complete halt, and then begin its free fall plummet to the ground.

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The explanation about "red balloon will move forward in an accelerating car"  is given below:

Acceleration is a vector quantity that describes the rate at which an object changes its velocity. It is the rate at which the velocity of an object changes in magnitude or direction, or both. In other words, it tells us how quickly an object is speeding up or slowing down. Acceleration has units of meter per second squared (m/s²) and its direction is the same as the direction of the change in velocity.

Bill Nye's claim that an inflated red balloon will move forward in an accelerating car.

And it can be understood through the principles of motion.

When a car is accelerating, its velocity changes, and this creates a force called the "inertial force" that acts in the opposite direction of the acceleration. This force is also referred to as the "fictitious force" or the "centrifugal force."

Hence, the inflated red balloon does move forward in an accelerating car.

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Answer:

metal conducts heat faster than wood. which means the metal conducted heat away from your hand (or whatever it is) faster than wood.

Explanation:

just because they feel warm/cold doesn't always mean that it is warm/cold. if they both were sitting at room temp for a long time, then both will eventually reach the temp of the room. even though they are the same temp the metal will feel colder than the wood because of the thermal conductivity of the metal compared to the wood.

The different thermal conductivities of metal and plastic are important in the design of the bowl is metal conducts heat faster than Plastic. which means the metal conducted heat away from your hand (or whatever it is) faster than Plastic.

Thermal conductivity can be defined as the degree to which heat is transmitted through the cross-section of the unit of an object, where the temperature exits directly across the surface.

Electrical conductivity is a measure of how much energy (moving charge) can pass through objects under the influence of a used electric field. Thermal conductivity measures how heat (heat moving energy) can pass through objects below temperature differences.

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The road curve should be banked at an angle of 8.67 degrees for maximum control of the racing car.

The angle θ at which the road curve should be banked for maximum control of the racing car can be found using the formula for centripetal force and the frictional force equation.

The centripetal force equation is Fc = mv^2/r,

where Fc is the centripetal force,

m is the mass of the car,

v is the velocity of the car,

and r is the radius of the curve.

The frictional force equation is Ff = μmg,

where Ff is the frictional force,

μ is the coefficient of friction,

m is the mass of the car,

and g is the acceleration due to gravity.

For maximum control, the centripetal force and the frictional force should be equal, so we can set the two equations equal to each other and solve for θ:

mv^2/r = μmg

v^2/r = μg

tanθ = v^2/(rμg)

θ = tan^-1(v^2/(rμg))

Plugging in the given values for v, r, μ, and g, we get:

θ = tan^-1((21 m/s)^2/(88.3 m * 0.13 * 9.8 m/s^2))

θ = 8.67 degrees

Therefore, the road curve should be banked at an angle of 8.67 degrees for maximum control of the racing car.

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Explanation: a reduction in genetic diversity and discomfort for animals that have very exaggerated characteristics.

Answer:

47.2m

Explanation:

The final velocity of car 2 is 67.5248. The momentum is conserved in the given problem,

According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.

The given data in the problem is;

(m₁) is the mass of 1st car=  12,745 kg.

(u₁) is the initial velocity of 1st car= 20 m/s

(m₂) is the mass of 2nd car = 4125 kg

(u₂) is the initial velocity of 2nd car = 15 m/s

(v₁) is the velocity after the collision of 1st car = 3 m/s

The final velocity of car 2,v₂=?

According to the law of conservation of momentum;

Momentum before collision =Momentum after collision

\(\rm m_1u_1 + m_2u_2 = m_1v_1 + m_2v_2 \\\\ 12745 \times 20 +4125 \times 15 = 12745 \times 3 + 4125 \times v_2 \\\\ v_2 = 67.52 \ m/sec\)

Hence, the final velocity of car 2 is 67.5248.

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ANSWER:

(a) 20 m/s^2

(b) 250 m

STEP-BY-STEP EXPLANATION:

Given:

Mass (m) = 250 g = 0.25 kg

Force (F) = 20 N

Frictional force (Ff) = 15 N

(a)

The net force on the block is:

We know that:

(b)

We can calculate the partial distance from the following equation:

initial velocity (u) = 0 (start from rest)

Answer:

the size, length, or amount of something, as established by measuring.

Explanation:

When a 30 micro of capacitor is attached to the a 9 v battery at its intermediate level, the equation states that 2.7μC is the charges on the capacitor.

A capacitor operates on the basis that capacitance of the a conductor exhibits rise when a grounding conductor is introduced near it. As a result, the capacitance has parallel plates that are spaced apart from one another and facing in opposing directions.

Two conductors that are separated from one another and positioned close to one another make up a capacitor, a electrical energy storage device. A parallel-plate capacitor is a simple example with one such storage device.

If we rearrange the previous formula to account for C=30F and V=9v in our issue, we can calculate the charge held in the capacitor:

             Q=CV

                =(30μF) (9v)

                =2.7μC

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The horizontal velocity of the projectile it leaves the launcher is 0.283 m/s.

The horizontal speed of a projectile is regular, and there's a vertical acceleration because of gravity; its cost is 9.8 m/s/s, down, The vertical speed of a projectile changes via nine.8 m/s every second, The horizontal motion of a projectile is impartial to its vertical movement.

Projectile motion is a form of motion experienced with the aid of an object or particle that is projected in a gravitational field, such as from Earth's floor, and movements alongside a curved route below the action of gravity best.

Projectile motion is the movement of an object thrown (projected) into the air. After the initial force that launches the item, it most effectively reports the pressure of gravity. The object is known as a projectile, and its route is called its trajectory.

Calculation:-

Horizontal distance = 40 cm

                          = 0.4 m

height of table = 10 m

Let vertical velocity is 0.

S = ut +1/2 at²

10 = 0 + 0.5 × 10 t²

t² = 10/5

t    = 1.414 sec.

At the same time, it will take to cover a horizontal distance of 0.4 m.

Velocity = distance/time

                = 0.4/1,414

                  = 0.283 m/s

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To find the vector B - A, draw the vector A with its tail at the origin and draw the vector -A with its tail at the head of vector B. The vector B - A is then the vector drawn from the origin to the head of vector -A.

What is Vector?

In physics, vectors are often used to represent physical quantities such as velocity, force, and acceleration. They are typically represented graphically as arrows, with the length of the arrow representing the magnitude of the vector and the direction of the arrow representing the direction of the vector. Vectors can be added and subtracted to find the resulting vector, and they can also be multiplied by scalars (real numbers) to change their magnitude.

Without the provided figure, it is difficult to provide a specific answer. However, in general, to find the vector sum A + B, draw the vector A with its tail at the origin of the coordinate system and draw the vector. The vector sum A + B is then the vector drawn from the origin to the head of vector B.

To find the vector difference A - B, draw the vector A with its tail at the origin and draw the vector -B with its tail at the head of vector A. The vector difference A - B is then the vector drawn from the origin to the head of vector -B.

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Answer:

blood picks up waste products such as carbon dioxide

returns to right atrium

moves to right ventricle and to lungs

blood travels from the lungs to the left atrium

carries oxygen and nutrients to the body cells

Explanation:

In the circulatory system, the blood carries the carbon dioxide to the right atrium of the heart through superior vena cava, then it move to right ventricle through tricuspid valve. The blood move to lungs following pulmonary artery and from lungs blood travels to the left atrium. From left atrium blood moves to the rest of the body through aorta and carries oxygen and nutrients to the whole body cells through.

Hence, the correct order is as follows:

blood picks up waste products such as carbon dioxide

returns to right atrium

moves to right ventricle and to lungs

blood travels from the lungs to the left atrium

carries oxygen and nutrients to the body cells

What is the maximum height the ball will reach in the air?

Kinematics equation used:

We're given that the initial velocity is 12.0 m/s in the y-direction. At the maximum height, the vertical velocity of the ball will be 0 m/s, otherwise it would not be at maximum height. This is our final velocity.

The only acceleration in the system is acceleration due to gravity, which is approximately \(9.8\:\mathrm{ m/s^2}\). However, the acceleration is acting down, whereas the ball is moving up. To express its direction, acceleration should be plugged in as \(-9.8\:\mathrm{m/s^2}\). We have three variables, and we are solving for the fourth, which is distance travelled. This will be the maximum height of the ball.

Substitute \(v_i=12\), \(v_f=0\), \(a=-9.8\) to solve for \(d\):

\(0^2=12^2+2(-9.8)(d),\\0=144-19.6d,\\-19.6d=-144,\\d=\frac{-144}{-19.6}=7.34693877551\approx \boxed{7.35\text{ m}}\)

What is the velocity of the ball when it hits the ground?

This question tests a physics concept rather than a physics formula. The vertical velocity of the ball when it hits the ground is equal in magnitude but opposite in direction to the ball's initial vertical velocity. This is because the ball spends equal time travelling to its max height as it does travelling from max height to the ground (ball is accelerating from initial velocity to 0 and then from 0 to some velocity over the same distance and time). Since the ball has an initial vertical velocity of +12.0 m/s, its velocity when it hits the ground will be \(\boxed{-12.0\text{ m/s}}\). (The negative sign represents the direction. Because velocity is a vector, it is required.)

**Since my initial answer exceeds the character limit, I've attached the first question to Part B as an image. Please refer to the attached image for the answer and explanation to the first question of Part B. Apologies for the inconvenience.**

What is the direction of the velocity of the ball when it hits the ground? Express your answer in terms of the angle (in degrees ) of the ball's velocity with respect to the horizontal direction (see figure).

This question uses a similar concept as the second question of Part A. The vertical velocity of the ball at launch is equal in magnitude but opposite in direction to the ball's final velocity. The horizontal component is equal in both magnitude and direction throughout the entire launch, since there are no horizontal forces acting on the system. Therefore, the angle below the horizontal of the ball's velocity when it hits the ground is equal to the angle of the ball to the horizontal at launch.

To find this, we need to use basic trigonometry for a right triangle. In any right triangle, the tangent/tan of an angle is equal to its opposite side divided by its adjacent side.

Let the angle to the horizontal at launch be \(\theta\). The angle's opposite side is represented by the vertical velocity at launch (12.0 m/s) and the angle's adjacent side is represented by the horizontal velocity at launch (2.3 m/s). Therefore, we have the following equation:

\(\tan \theta=\frac{12.0\text{m/s}}{2.3\text{ m/s}}\)

Take the inverse tangent of both sides:

\(\arctan (\tan \theta)=\arctan (\frac{12.0}{2.3})\)

Simplify using \(\arctan(\tan \theta)=\theta \text{ for }\theta \in (-90^{\circ}, 90^{\circ})\):

\(\theta=\arctan(\frac{12.3}{2.3}),\\\theta =79.14989537\approx \boxed{79.15^{\circ}}\)

We can express our answer by saying that the direction of the velocity of the ball when it hits the ground is \(\boxed{\text{approximately }79.15^{\circ} \text{ below the horizontal}}\) or \(\boxed{\text{approximately }-79.15^{\circ} \text{ to the horizontal}}\).

Acoustic power, also known as sound intensity, is defined as the power transmitted by a sound wave per unit area in a direction perpendicular to that area.

A sound wave is a type of energy that propagates in a medium by adiabatic charging and discharging. Important quantities for describing sound waves are sound pressure, particle velocity, particle displacement, and sound intensity.

Sound waves can be classified into three categories:

Longitudinal waves, mechanical waves, pressure waves.

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It will cost 0.324 Dollars to light six 100w light bulbs for six hours if the price of electrical energy is $0.09/ kwh.

kwh is commercial unit of electric energy. 1 unit= 1 kwh.

When 100 w power device is run for 1 hour, the amount of electrical energy consumed is 1 kwh.

We will find total units of electrical energy consumed in the given question.

energy consumed by 6 bulbs = 6×100= 600 w( joules per second).

The value in kwh is = 600÷1000

                                = 0.6kwh

Total energy consumed in 6 hours is = 0.6×6 = 3.6 kwh

So, the cost is = 3.6×0.09 = 0.324 dollars.

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Answer:

Yes , insulation has no role

According to the given statement , your sister's mass on Mars is approximately 74.0 kg.

To find your sister's mass on Mars, we can use the formula:

Weight = Mass * Acceleration due to gravity

First, let's calculate your sister's mass on Earth using the given weight and acceleration due to gravity:

Weight on Earth = 725 N
Acceleration due to gravity on Earth = 9.80 m/s²

Using the formula, we can rearrange it to solve for mass:

Mass on Earth = Weight on Earth / Acceleration due to gravity on Earth

Substituting the values, we get:

Mass on Earth = 725 N / 9.80 m/s²

Calculating this, we find that your sister's mass on Earth is approximately 74.0 kg.

Next, let's calculate your sister's mass on Mars using the given weight and acceleration due to gravity:

Weight on Mars = ?
Acceleration due to gravity on Mars = 3.72 m/s²

Using the same formula, we can rearrange it to solve for mass:

Mass on Mars = Weight on Mars / Acceleration due to gravity on Mars

We know that weight is directly proportional to mass, so the ratio of the weights on Mars and Earth will be the same as the ratio of the masses on Mars and Earth:

Weight on Mars / Weight on Earth = Mass on Mars / Mass on Earth

Substituting the known values, we have:

Weight on Mars / 725 N = Mass on Mars / 74.0 kg

Simplifying this equation, we can cross multiply:

Weight on Mars * 74.0 kg = 725 N * Mass on Mars

Dividing both sides of the equation by 725 N, we get:

Weight on Mars * 74.0 kg / 725 N = Mass on Mars

Finally, substituting the given values, we can calculate your sister's mass on Mars:

Mass on Mars = (725 N * 74.0 kg) / 725 N

Simplifying this, we find that your sister's mass on Mars is approximately 74.0 kg.

Therefore, your sister's mass on Mars is approximately 74.0 kg.

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Answer: friction has no role to play in this case. because friction usually occurs between to parts which come in contacts. examples (a)our joints in the human body (b)two mechanical parts (shafts).

Explanation:

However what this topic relates to is gravity. The pebble and paper both weigh one gram, but have different density this is the sole reason why if both are drop from same height the pebble would reach the ground faster than the paper because it is more denser. unlike the paper with a lesser density which would take a longer time to reach the ground.

The cost of operating a 86.13-watt freezer for a month, assuming the cost of electricity is $0.02 per kilowatt-hour and a month has 30 days, would be $1.24.

To calculate the cost of operating a 86.13-watt freezer for a month, we need to first calculate the amount of energy it consumes in a month. We know that the power rating of the freezer is 86.13 watts, which means it consumes 0.08613 kilowatts of electricity every hour. In a day, the freezer would consume 2.07 kilowatt-hours (0.08613 kW x 24 hours). For a 30-day month, the total energy consumption would be 62.1 kilowatt-hours (2.07 kW x 30 days).

Now that we know the total energy consumption, we can calculate the cost of electricity. The cost of electricity is $0.02 per kilowatt-hour, which means the cost of operating the freezer for a month would be 62.1 kilowatt-hours x $0.02 per kilowatt-hour = $1.24.

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Answer:

I think its B.

Explanation:

Explanation:

1. Low-energy particle detector: This particle detector measures the charged particles of the solar winds.

2. Magnetometer boom: This device measures magnetic fields produced by astronomical bodies.

3. High-gain antenna: A HGA has a narrow radio beam that is used to enhance the strength of signal. They simply amplify the weak signals.

4. Photopolarimeter: This is an instrument that is used to measure the strength and intensity and polarization of reflected light.

Answer:

what they said

Explanation:

The value of the inductance L is approximately 1193.25 mH.

To solve for the value of the inductance L, we can use the formula:

Vrms = Ipeak * (2 * pi * f * L)

where:

Vrms = 9.0 V

Ipeak = 60 mA = 0.06 A

f = 20 kHz

Substituting the values into the formula:

9.0 V = 0.06 A * (2 * pi * 20,000 Hz * L

Simplifying:

L = 9.0 V / (0.06 A * 2 * pi * 20,000 Hz)

L = 9.0 / (0.007536)

L = 1193.25 mH (rounded to two decimal places)

Therefore, the value of the inductance L is approximately 1193.25 mH.

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An inductor is connected to a 20 kHz oscillator that produces an RMS voltage of 9.0 V. The peak current is 60 mA. The value of the inductance L is  1.692 mH.

Let's start by using the given information and then we'll solve for the value of the inductance L step by step:
1. Frequency of the oscillator (f) = 20 kHz = 20,000 Hz
2. RMS voltage (Vrms) = 9.0 V
3. Peak current (I_peak) = 60 mA = 0.06 A
Now, let's find the peak voltage (V_peak) using the relationship between RMS voltage and peak voltage:
Vrms = V_peak / √2
V_peak = Vrms * √2
V_peak = 9.0 V * √2 ≈ 12.73 V
Next, we'll calculate the impedance (Z) of the inductor using Ohm's law, which relates peak voltage and peak current:
Z = V_peak / I_peak
Z ≈ 12.73 V / 0.06 A ≈ 212.17 Ω
Now, we'll use the formula for the impedance of an inductor:
Z = 2 * π * f * L
Let's solve for the inductance L:
L = Z / (2 * π * f)
L ≈ 212.17 Ω / (2 * π * 20,000 Hz)
L ≈ 1.692 × 10^-3 H
Finally, convert the inductance L to millihenries (mH):
L ≈ 1.692 mH
So, the value of the inductance L is approximately 1.692 mH.

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Answer:

b

Explanation:

Answer:

this is a longitudinal wave!!!

Explanation:

because you can see the compressions and rarefactions.

Answer:

200 N

Explanation:

There is only two needed factors in play here; the mass and acceleration

According to Newton's 2nd Law: F = m*a

Now Acceleration is Velocity over Time, so we have another factor in play: Acceleration = 50-30/5 = 20/5 = 4m/s^2

Net force = (50 kg)(4 m/s^2) = 50*4 = 200 Newtons

Answer:

C

Explanation:

I would have said B but air pressure acts at ALL angles(directions). C makes sense because the increase in the temperature would cause the molecules to bounce off the walls of the balloon and each other which exerts pressure.

Answer:

C c hagwguawnjaahwbhanwbhsqn2nusbwvwf

Answer:

13.7 J

Explanation:

In absence of air resistance, the mechanical energy of the object is conserved during the fall: this means that the initial gravitational potential energy that it has at the beginning of the fall will be entirely converted into kinetic energy when the book is just about the hit the ground.

Therefore, this also means that we can calculate the mechanical energy at the beginning of the fall, as this will be equal to the mechanical energy just before the book hits the ground.

At the beginning of the fall, the mechanical energy is all gravitational potential energy:

where

m = 0.5 kg is the mass of the book

is the acceleration of gravity

h = 2.8 m is the height above the ground

Substituting,