The ratio of the potential difference across a conductor to the current in the conductor is called
A) conductivity
B) resistance
C) charge
D) power

Answer:

K.E is 90.625 J

Explanation:

Data:

Mass = m = 43.5kg

Distance = d = 1.3km = 1300 m

Time = t = 10.4 min = 624 sec

Accelaration = a or g = 9.8

Formula for kinrtic energy

K.E = 1/2mv²

Find velocity

V = d/t = 1300/624 = 2.0833333333333 m/s

Put values in formula

K.E = 1/2 (43.5)(2.084)² = 90.624999999995

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The vertical positions, velocity, and acceleration during the downward part of the trajectory of the ball are given as +Y, +V, and +a respectively.

The motion of an object in a given direction may be considered a positive or negative motion depending on a given conventional direction.

The downward motion of an object toward the earth's surface is considered a positive motion while the upward motion of an object against the gravitational pull of the earth is considered a negative motion.

The vertical positions, velocity, and acceleration of an object falling under gravity are positive.

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Answer:

hhmmmmmhmmmm hmhmmmm hmmm yeah i got nothing

Explanation:

While the density of a material refers to the mass per volume of one piece, the bulk density refers to the mass per unit volume of a larger sample or bulk quantity of the material.

The bulk density of a material refers to the mass per unit volume of a large quantity or a bulk sample of the material. It takes into account the overall volume occupied by multiple pieces or particles of the material.

Unlike the density of a single piece of the material, which considers the mass and volume of an individual unit, the bulk density considers the collective mass and volume of a larger sample that contains multiple pieces or particles.

It provides an average measure of the material's density when it is present in a larger quantity or in bulk form.

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Answer:

Using the Newton equation

V²=U² +2as

Given; V=9.2m/s U = 0m/s( because it starts from rest)

S=26.2m.

9.2²=0²+2(26.2)a

a =9.2²/2(26.2)

a=84.6/52.4

a=1.60m/s²

Answer:

2.A

3.D

Explanation:

HOPE THIS HELPS!! :)

Answer:

B Newton's second law

Explanation:

An empty grocery cart is easier to move because there is less mass in an empty cart compared to a full cart. Newton's second law state that an object's acceleration depends on the mass of the object and the force applied.

Answer:

it would melt with the hot weather

Explanation:

It melts and the water changes color

Answer:

Explanation:

Kinetic energy involves motion so something that is not moving has zero kinetic energy.

Potential energy does not involve motion and is based on position in a field like gravity and magnetic.

Energy is the capacity for doing work.

The work done on the astronaut by the force from the helicopter is 11642.4 J.

The work done on the astronaut by the force from the helicopter can be calculated using the formula W = Fd, where W is work, F is force, and d is distance. In this case, the force is the tension in the cable, which is equal to the weight of the astronaut plus the force needed to accelerate the astronaut.

The weight of the astronaut can be calculated using the formula w = mg, where w is weight, m is mass, and g is the acceleration due to gravity. Therefore, the weight of the astronaut is 72 kg x 9.8 m/s^2 = 705.6 N.

The force needed to accelerate the astronaut can be calculated using the formula F = ma, where F is force, m is mass, and a is acceleration. In this case, the acceleration is g/10, so the force needed to accelerate the astronaut is 72 kg x (9.8 m/s^2 / 10) = 70.56 N.

Therefore, the total force on the astronaut is 705.6 N + 70.56 N = 776.16 N. The distance lifted is 15 m.

Using the formula W = Fd, the work done on the astronaut is W = 776.16 N x 15 m = 11642.4 J.

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Answer:

Explanation:

We can use the equation:

$F = ma$

where F is the force, m is the mass, and a is the acceleration.

To find the acceleration, we can use:

$a = \frac{\Delta v}{\Delta t}$

where $\Delta v$ is the change in velocity and $\Delta t$ is the time interval.

Rearranging the first equation, we get:

$t = \frac{m\Delta v}{F}$

Substituting the given values, we get:

$t = \frac{(1300\text{ kg})(15\text{ m/s} - 27\text{ m/s})}{21000\text{ N}} \approx 1.86\text{ s}$

Therefore, the car experienced the force for about 1.86 seconds.

Answer:

a chicken

a chicken came first

Answer:

A Chicken

A chicken came first

c. Elastic energy is not a form of kinetic energy.

What is kinetic energy?

Kinetic energy is the energy generated by an object's movement or motion. It's the energy stored in moving objects, and it's dependent on the object's mass and speed. As the object's mass and velocity rise, so does the amount of kinetic energy it possesses.

Types of kinetic energy include:

Mechanical energy: The total energy stored in a moving object's position and motion is known as mechanical energy.

Thermal energy: Thermal energy is the energy that results from the motion of particles in a substance. The greater the speed of the particles, the greater the thermal energy.

Sound energy: The energy created by the vibration of an object is known as sound energy. It travels in the form of waves through the air.

Elastic energy: Elastic energy is the energy kept in an object when it is compressed or extended. For instance, when you extend a rubber band or compress a spring, the energy stored in them is elastic energy.

Therefore, from the given options, elastic energy is not a type of kinetic energy.

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Answer:

A yellow banana reflects only yellow light,

Explanation:

The force constant of the spring is 200.696 N/m & The height the object achieves when the spring releases its energy is 2.5087 m

The spring constant is the force needed to stretch or compress a spring, divided by the compressive or expansive distance. It's used to determine stability or instability in the spring, and therefore the system it's intended for. we know,

F = kx

Therefore,

k = F/x

We also know that the force being exerted on the spring is equal to the mass of the object. Hence, F = mg = 5.13 * 9.8 N = 50.174 N and we know compression due to the mass is 0.25m. Therefore,

K = 50.174/0.25 N/m

K = 200.696 N/m

Therefore, The Spring Constant is 200.696 N/m

On release, the spring potential energy gets converted to kinetic energy. Hence, on release, the height attained by the object is given by:

h = \(1/2 kx^{2}\)

We know that k=200.696 N/m and x=0.25 m. Therefore the height is:

h = \(1/2 (200.696 N/m)(0.25 m)^{2}\)

h = 2.5087 m

Therefore, the force constant of the spring is 200.696 N/m & The height the object achieves when the spring releases its energy is 2.5087 m

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Answer:

D. Adapt your communication style.

Explanation:

It is quite difficult to gauge the protocol here given the lack of information about the work environment; but as a general answer, communication skills are always handy. Furthermore, it seems that Marta in particular struggles with this. Assuming Marta is providing a specialized service of a sort, she would need to understand that there is a reason why her services are required at all. Through this, hopefull she'll understand that they are most likely outside of this field of work, and ergo [she] must cater and gear her actions towards the interest of the person(s) in question.

It is to be noted that this is merely my surmise.

Now that we have the resistance (R) and the voltage (V), we can use Ohm's Law to calculate the current (I):
I = V / R
I = 150 volts / 5.35 × 10^-5 Ω
I ≈ 2.8 × 10^6 amperes

The current flowing through a length of metal wire can be determined using Ohm's Law, which states that the current (I) is equal to the voltage (V) divided by the resistance (R).

In this case, the resistance of the wire can be calculated using the resistivity (ρ) of the metal, the length (L) of the wire, and the radius (r) of the wire.

The formula for calculating the resistance of a wire is:
R = (ρ * L) / A

Where:
R is the resistance of the wire,
ρ is the resistivity of the metal,
L is the length of the wire, and
A is the cross-sectional area of the wire.

To find the current, we need to know the voltage supplied by the power source. Since the question does not provide this information, we cannot determine the exact current flowing through the wire.

However, I can provide you with an example to demonstrate how to calculate the current using the given resistivity and the length of the wire.

Let's assume that the voltage supplied by the power source is 150 volts.

To find the current, we need to calculate the resistance of the wire first. Let's say the length of the wire is 10 meters, and the radius is 0.01 meters.

Using the formula for resistance, we can calculate the cross-sectional area (A) of the wire:
A = π * r^2
A = 3.14 * (0.01)^2
A = 0.000314 square meters

Now, we can calculate the resistance of the wire using the resistivity (1.68 × 10^-8 ω ∙ m), the length (10 meters), and the cross-sectional area (0.000314 square meters):
R = (ρ * L) / A
R = (1.68 × 10^-8 ω ∙ m * 10 meters) / 0.000314 square meters
R = 5.35 × 10^-5 Ω

Now that we have the resistance (R) and the voltage (V), we can use Ohm's Law to calculate the current (I):
I = V / R
I = 150 volts / 5.35 × 10^-5 Ω
I ≈ 2.8 × 10^6 amperes

Please note that this is just an example calculation, and the actual current will depend on the voltage supplied by the power source.

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Answer:

(1) Support

(2) Tension

(3) Reaction

The constraint forces are forces that occur in pairs such that the net force (effect) is zero

The details of the constraint forces are;

(1) The support force at the top of the swing acting upwards

(2) The tension in the swing rope acting upwards

(3) The (normal) reaction between the legs of the swing frame and the ground

Explanation:

The normal reaction is the force equal in magnitude and opposite in direction to the total weight force the swing and the person on the swing posses due to gravitational attraction which prevents the downward or sideways motion of the entire swing

Answer:

the following image will make you understand

Explanation:

Answer:

The car's kinetic energy is 751,500 J.

The car's potential energy is 0 J.

Explanation:

The kinetic energy equation is used as KE = 1/2mv^2 and the potential energy equation is used as PE = mgh.  Your mass for the car is 1670 kg and the velocity would be 30 m/s.  30^2 would equal to 900 and you multiply that by 1670 for 1,503,000.  Divide that number by 2 since there is 1/2 behind it to get your car's kinetic energy which is 751,500 J.

The potential energy which is calculated by mass times gravitational energy times height would be 0 J.  Because the car is at a standard height on the ground, it would make sense for the height to be 0 meters and when multiplying it, your total potential energy would be 0 J.

Answer:

gunrun

Explanation:

0.88 seconds is the additional time that will pass before the ball passes the tree branch on the way back down.

Find the time it takes for the ball to reach the tree branch on the way up.

t₁ = (16.3 m/s) / (9.81 m/s²)

t₁ = 1.67 seconds

Find the height of the ball at the time it reaches the tree branch on the way up.

h₁ = (16.3 m/s) * (1.67 seconds) - (0.5) * (9.81 m/s²) * (1.67 seconds)²

h₁ = 7.71 m

Find the time it takes for the ball to reach the tree branch on the way down.

t₂ = (7.71 m - 0) / (9.81 m/s²)

t₂ = 0.79 seconds

Find the additional time that will pass before the ball passes the tree branch on the way down.

Additional time = t₁ - t₂

Additional time = 1.67 seconds - 0.79 seconds

Additional time = 0.88 seconds.

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so the value of wavelength λ=0.75*10^4 m

The frequency of the wave if its speed is 300 Metre per second is 3750 Hz.

v=fλ

Here, v is the velocity of the particle, f is the frequency and λ

is the wavelength.

f=vλ

ω=2πf

v=ωk

Here, ω

is the angular frequency and k is the wave-number.

In the given figure, the maximum distance from the mean position is 0.06 m. Therefore, we can say that the amplitude of the wave is 0.06 m.

A=0.06m

In the given figure, we observe there are five half wavelengths in 20 cm distance. Therefore, we can express this distance as,

20cm=5(λ2)

⇒λ=405

⇒λ=8cm

Therefore, the wavelength of the wave is 8 cm or 0.08 m.

We have the relation between velocity, wavelength and frequency as,

v=fλ

Here, v is the velocity of the particle, f is the frequency and λ

is the wavelength.

We rearrange the above equation for f as follows,

f=vλ

We substitute 300 m/s for v and 8 cm for λ

in the above equation.

f=300m/s0.08m

⇒f=3750Hz

Thus, the frequency of the wave if its speed is 300 Metre per second is 3750 Hz.

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Answer:

The correct answer is A. Thermal energy (heat) is defined as the sum of all the kinetic energies of all the particles in an object.

Of the statements given about the image formed by a single converging lens, only D is true.

The image formed by a converging lens is always inverted, meaning that if the object being viewed is right-side up, the image will be upside down.

This is a result of the way light rays are refracted as they pass through the lens.

Statements A, B, and C are all false. The orientation of the image depends on the location of the object relative to the lens, and whether the image is real or virtual depends on the location of the lens and the object.

Real images are formed when light rays actually converge at a point, while virtual images are formed when light rays appear to converge at a point.

The properties of the image formed by a converging lens can be determined using the thin lens equation and the magnification equation.

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Answer:

18.5 m/s

Explanation:

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The y-component of a velocity vector that had a magnitude of 37 m / s in a direction 30° from the x - axis would be 18.5 m / s .

The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.

Examples of vector quantities are displacement, velocity acceleration, force, etc.

As given in the problem we have to find out the y-component of a velocity vector that had a magnitude of 37 m / s in a direction 30° from the x - axis.

The y-component of a velocity vector = 37 × sin 30

                                                                   = 18.5 m / s

Thus , y-component of a velocity vector that had a magnitude of 37 m / s in a direction 30° from the x - axis would be 18.5 m / s.

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Dividing 120m and 8.0 m / s makes sense because 120 m is the distance travelled East and 8 m / s is velocity travelled East.

Using the velocity value of 6 m / s with 120 m would have been wrong because it is the South velocity. If you wanted to use 6 m / s velocity value, you have to find the distance travelled South. Since there is no acceleration, the time taken to travel East, South and the resultant distance will all be the same.

v = d / t

v = Velocity

d = Distance

t = time

For East,

t = 120 / 8

t = 15 s

tan θ = Vs / Ve

tan θ = 6 / 8

θ = 36.9°

For south,

tan 36.9° = d / 120

d = 0.75 * 120

d = 90 m

t = 90 / 6

t = 15 s

As you can see both time values are same.

Therefore, dividing 120m and 8.0 m / s makes sense because 120 m is the distance travelled East and 8 m / s is velocity travelled East.

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The car must start at a height of approximately 127.55 meters on the hill in order to achieve a speed of 50 m/s at the bottom, assuming it is engineless and resistance-free.

To determine the height on a hill at which an engineless, resistance-free car must start in order to achieve a speed of 50 m/s at the bottom, we can use the principle of conservation of mechanical energy.

According to this principle, the sum of the potential energy and the kinetic energy of an object remains constant in the absence of external forces.

At the top of the hill:

The car has only potential energy (PE) due to its height above the bottom.

At the bottom of the hill:

The car has both potential energy and kinetic energy (KE).

Since the car is engineless and resistance-free, we can neglect any energy losses due to friction or air resistance.

The total mechanical energy (E) at the top of the hill is equal to the total mechanical energy at the bottom of the hill:

Etop = Ebottom

The potential energy (PE) at the top of the hill is given by the formula:

PE = m * g * h

Where m is the mass of the car, g is the acceleration due to gravity, and h is the height of the hill.

The kinetic energy (KE) at the bottom of the hill is given by the formula: KE = (1/2) * m * \(v^{2}\),

Where v is the speed of the car at the bottom.

Therefore, we have:

PEtop = KEbottom

m * g * h = (1/2) * m * \(v^{2}\)

We can cancel out the mass (m) from both sides of the equation:

g * h = (1/2) * \(v^{2}\)

Now, we can solve for the height (h):

h = (1/2) * \(v^{2}\) / g

Substituting the given values:

v = 50 m/s (speed at the bottom)

g = 9.8 m/\(s^{2}\) (acceleration due to gravity)

h = (1/2) * \((50 m/s)^2\) / (9.8 m/\(s^{2}\))

h = 127.55 m

Therefore, the car must start at a height of approximately 127.55 meters on the hill in order to achieve a speed of 50 m/s at the bottom, assuming it is engineless and resistance-free.

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