Noah plans on using a pendulum to determine the height of a tower. He attaches a mass to the end of a thin cord hanging from the tower's ceiling (let's assume the cord almost touches the ground). Noah determines the period of oscillation to be 12 s. How high is the tower?

The kettle is made of a nichrome wire of low resistance.

The resistance in Christmas tree lights is higher than in a kettle due to the differences in their design and the materials used in their construction.

Christmas tree lights are typically made up of a string of small incandescent bulbs that are connected in series. These bulbs have a relatively high resistance, which causes the electrical current to encounter more resistance as it passes through the string of bulbs. This results in the bulbs producing light, but not getting excessively hot.

In contrast, a kettle is designed to heat water by using a heating element made of a material, such as nichrome wire, that has a relatively low resistance. This low resistance allows a high current to flow through the heating element, which causes it to get very hot and transfer its heat to the water.

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B: the maximum speed of the emitted electrons decreases.

The photoelectric effect is the phenomenon where electrons are emitted from a metal surface when light of sufficient energy, or frequency, falls on it. The energy of a photon of light is directly proportional to its frequency (E = hf), where h is Planck's constant and f is the frequency of the light.

When the frequency of the incident light is decreased, the energy of each photon decreases. According to the photoelectric effect equation (E = hf = Φ + 1/2mv²), where Φ is the work function of the metal and v is the speed of the emitted electron, if the energy of the incident photon is lower than the work function, no electrons will be emitted.

Since the frequency of the light is directly related to its energy, decreasing the frequency decreases the energy of the photons. Consequently, fewer electrons will have sufficient energy to overcome the work function and be emitted from the metal. Therefore, the number of electrons emitted from the metal decreases.

Furthermore, the maximum speed of the emitted electrons is determined by the energy of the incident photons. With decreased frequency and lower energy photons, the maximum kinetic energy of the emitted electrons decreases. As kinetic energy is directly proportional to the square of the velocity (1/2mv²), the maximum speed of the emitted electrons decreases.

The correct answer is B: the maximum speed of the emitted electrons decreases. As the frequency of the incident light is decreased, the number of electrons emitted from the metal also decreases, and the maximum speed of the emitted electrons decreases due to the lower energy of the incident photons.

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Answer:The density of a substance is defined as its mass per unit volume. So we can calculate the density of silver using the given values:

density = mass / volume

Substituting the given values, we get:

density = 21 g / 2 cm^3

Simplifying, we get:

density = 10.5 g/cm^3

Therefore, the density of the piece of silver is 10.5 g/cm^3, which is option D.

Explanation:

Answer:

=>8x+9x+5+3

=>8x+9x+5+3=>17x+8

Answer:

below

Explanation:

According to Newtons Second Law of Motion, also known as the Law of Force and Acceleration, a force upon an object causes it to accelerate according to the formula net force = mass x acceleration. So the acceleration of the object is directly proportional to the force and inversely proportional to the mass.

the fractional intensity i/imax at the point on the screen 4.10 mm from the center of the principal maximum is approximately 0.123.

The given parameters are:Width of the slit, d = 0.340 mm

Wavelength of the light, λ = 546.1 nm

Distance from the slit to the screen, L = 90 cm

Distance of the point on the screen from the center of the principal maximum, y = 4.10 mm

The distance between the center of the principal maximum and the first minima is given by:

ym = (m * λ * L) / d

Where m is the order of the minima

From the above equation, we can calculate the order of the minima closest to the given point on the screen as:

m = (y * d) / (λ * L) = (4.10 × 10^(-3) × 0.340 × 10^(-3)) / (546.1 × 10^(-9) × 90 × 10^(-2)) ≈ 1

The intensity at a point on the screen at distance y from the center of the principal maximum is given by the equation:

i / imax = [sin(πa sinθ / λ) / (πa sinθ / λ)]^2

where a is the width of the slit and θ is the angle between the line joining the point on the screen and the center of the principal maximum, and a line perpendicular to the slit at the point where the diffracted beam passes through the slit.θ can be approximated as:

θ ≈ (m * λ) / d = (1 × 546.1 × 10^(-9)) / 0.340 × 10^(-3) ≈ 1 × 10^(-3) radians≈ (180 / π) × (1 × 10^(-3)) degrees = 0.057296 degrees

Putting the values of θ and a in the equation for intensity, we get:

i / imax = [sin(πa sinθ / λ) / (πa sinθ / λ)]^2≈ [sin(π × 0.340 × 10^(-3) × (1 × 10^(-3)) / (546.1 × 10^(-9))) / (π × 0.340 × 10^(-3) × (1 × 10^(-3)) / (546.1 × 10^(-9)))]^2≈ 0.123

Thus, the fractional intensity i/imax at the point on the screen 4.10 mm from the center of the principal maximum is approximately 0.123.

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The ways that the motor design would be improved have been written below

Here are two ways to improve the design of the motor and make it spin faster:

Increase the number of turns on the coil: The coil of wire in the motor generates a magnetic field when electric current flows through it. By increasing the number of turns in the coil, the magnetic field will be stronger, which will cause the motor to spin faster. This is because the force that causes the motor to spin (called the torque) is proportional to the strength of the magnetic field.

Increase the voltage of the battery: The battery in the motor provides the electric current that flows through the coil and generates the magnetic field. By increasing the voltage of the battery, more current will flow through the coil, which will increase the strength of the magnetic field and cause the motor to spin faster. This is because the torque is also proportional to the amount of current flowing through the coil.

Overall, by increasing either the number of turns on the coil or the voltage of the battery (or both), the students can increase the strength of the magnetic field and the amount of torque generated by the motor, which will make it spin faster.

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Answer:

V = d/t

V = 55m/1.75s

V = 31.43 m/s

Answer:

direction should be the answer

Astronauts could use Mars's natural resources to grow food. Mars's atmosphere consists mostly of carbon dioxide, an essential gas for plant survival, and Martian soil has the essential nutrients plants need to survive.

Impulse is important because it is the force that changes an object's momentum.

Momentum is a physical concept that describes the movement of an object due to the product of its mass and velocity. Momentum is a vector quantity, meaning it has both a magnitude and a direction. In classical mechanics, momentum is conserved, meaning that the total momentum of a system remains constant over time.

In the examples given, impulse is what allows the elevator to be hoisted up, the nylon ropes to hold a climber's weight, the runner to move around the track, and the plane to take off from the runway. Without impulse, none of these activities would be possible.

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Ionic bonds include the transfer of electrons between atoms, the formation of ions with opposite charges, the attraction between positively and negatively charged ions, and the formation of a lattice structure in ionic compounds

Ionic bonds are a type of chemical bond that involves the transfer of electrons from one atom to another, resulting in the formation of ions with opposite charges. These ions are then attracted to each other due to their opposite charges, forming an ionic bond. Ionic compounds typically have a lattice structure, in which the ions are arranged in a repeating pattern. Example: NaCl, MgO, CaF2, Li2O, AlF3,

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BMI weight is calculated by D. Multiply weight by 703.

BMI (Body Mass Index) weight is calculated by dividing a person's weight in kilograms by their height in meters squared.

The formula for calculating BMI is: BMI = weight (kg) / height² (m²).

Therefore, the correct option for how BMI weight is calculated is  Multiply weight by 703. This is because the weight is multiplied by 703 to convert it from pounds to kilograms, and the height is converted from feet and inches to meters before being squared and used in the formula.

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Answer:

by using graphical meythod

Answer:

they both exert the same pressure

Explanation:

Pressure is the ratio of force to area. It is given as:

\(P=\frac{F}{A}\) ,  where F is the force, P is pressure and A is area

1) For the cuboid, the area of the base placed on the ground (A) = 8 cm × 3 cm = 24 cm² = 0.0024 m². Therefore the pressure is:

\(P=\frac{F}{A}=\frac{60}{0.0024} =25000N/m^2=25KN/m^2\)

2) For the cube, the area of the base placed on the ground (A) = 4 cm × 4 cm = 16 cm² = 0.0016 m². Therefore the pressure is:

\(P=\frac{F}{A}=\frac{40}{0.0016} =25000N/m^2=25KN/m^2\)

Therefore, they both exert the same pressure.

The wavelength of a sinusoidal wave is traveling along a rope. the oscillator that generates the wave completes 41.0 vibrations in 31.0 s. a given crest of the wave travels 430 cm along the rope in 15.0 s. wave is 332 cm.

To arrive at this answer, we can start by using the formula: wavelength = speed / frequency.
To find the frequency of the wave, we can use the information given about the oscillator: it completes 41.0 vibrations in 31.0 s. Therefore, the frequency is:
frequency = number of vibrations / time
frequency = 41.0 / 31.0
frequency = 1.32 Hz
Next, we need to find the speed of the wave. To do this, we can use the information about the crest of the wave traveling 430 cm in 15.0 s. The speed is:
speed = distance / time
speed = 430 cm / 15.0 s
speed = 28.7 cm/s
Now we can substitute the frequency and speed into the wavelength formula:
wavelength = speed / frequency
wavelength = 28.7 cm/s / 1.32 Hz
wavelength = 21.75 cm
However, this gives us the distance between two consecutive crests of the wave. To find the distance between two adjacent troughs, we need to double this value:
wavelength = 21.75 cm x 2
wavelength = 43.5 cm
Finally, we need to convert this value from centimeters to meters:
wavelength = 43.5 cm / 100
wavelength = 0.435 m
Therefore, the wavelength of the wave is 0.435 m (or 332 cm).

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The momentum of the car = 12978.9 kgm/s

The mass of the car, m = 1881 kg

The speed, v = 6.9 m/s

The momentum, ρ, is given by the formula:

ρ = mv

Substitute m = 1881, v = 6.9 into the formula

ρ = 1881 x 6.9

ρ = 12978.9 kgm/s

The momentum of the car = 12978.9 kgm/s

Answer:

Explanation:

Let's go through each one.

short-wavelength - not all of them got short wavelengths.

stream of photons - yup, they all got a stream of photons, but the longer wavelengths' photons don't carry much energy such as the shorter wavelengths.

energy in atoms - yes, all wavelengths have energy, the short wavelengths carry more energy than the longer ones.

only from radioactive material - not at all. Radio waves and microwaves are not radioactive! only the wavelengths that carry a large amount of energy are radioactive - these are the shorter wavelengths - these might be gamma rays and x-rays.

speed of 300,000 kilometers per second - yes! all electromagnetic radiation travels at this speed! isn't it amazing?

travel through vacuum of space - yup, all of them.

Hope this helps!

Identify the parts of the formula described by Newton's second;1. Force (F),2. Mass (M),3. Acceleration (a)

What is the Acceleration ?

Acceleration is the rate of change of an object's velocity. It is the rate at which an object's speed and direction changes over time. Acceleration can be positive or negative, meaning the object can be speeding up or slowing down. Acceleration is measured in m/s2 and is calculated by taking the change in velocity over the change in time. It also contains both magnitude and direction because it is a vector quantity. Forces such as gravity and friction can cause an object to accelerate.

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Answer:

Approximately \(0.388\; {\rm s}\), assuming that air resistance is negligible and that \(g = 9.81\; {\rm m\cdot s^{-2}}\).

Explanation:

Initial vertical velocity of the object: \(u = 11.0\; {\rm m\cdot s^{-1}}\), upwards (same as that of the rollercoaster.)

Initial height of the object: \(h_{0} = 5.00\; {\rm m}\).

If air resistance is negligible, this object will accelerate downwards at a constant \(a = (-g) = (-9.81)\; {\rm m\cdot s^{-2}}\). Note that \(a\) is negative since the object is accelerating downwards.

The SUVAT equation \(h = (1/2)\, a\, t^{2} + u\, t + h_{0}\) gives the height \(h\) of this object at time \(t\). Note that while the initial height is \(5.00\; {\rm m}\), \(h = 0\) when the object reaches the ground.

Since acceleration \(a\), initial velocity \(u\), and initial height \(h_{0}\) are all given, setting \(h\!\) to \(0\) and solving for \(t\) will give the time it takes for this object to reach the ground:

\((1/2)\, a\, t^{2} + u\, t + h_{0} = 0\).

\((1/2)\, (-9.81) \, t^{2} + 11.0\, t + 5.00 = 0\).

\((-4.905)\, t^{2} + 11.0\, t + 5.00 = 0\).

Solve this equation for \(t\!\) using the quadratic formula. Note that \(t > 0\) since \(t\) denotes the amount of time required for the object to reach the ground.

\(\begin{aligned} t &= \frac{-11.0 + \sqrt{11.0^{2} - 4 \times (-4.905) \times 5.00}}{2\times (-4.905)} \\ &\approx 0.388\; {\rm s}\end{aligned}\).

The other root of this quadratic equation is negative and isn't a valid solution to the question.

In other words, it will take approximately \(0.388\; {\rm s}\) for this object to reach the ground.

Answer:  Gravity is the force that keeps planets in orbit around the Sun. Gravity alone holds us to Earth's surface.

Planets have measurable properties, such as size, mass, density, and composition. A planet's size and mass determines its gravitational pull.

A planet's mass and size determines how strong its gravitational pull is.

Models can help us experiment with the motions of objects in space, which are determined by the gravitational pull between them.

Explanation:

Answer:

v=3.66,h-3.66

Explanation:

vertical = 10sin60 - 10sin 30

horizontal =10cos60 + 10cos 30

v = 10×0.8660-10×0.5

h = 10×0.5 + 10 × 0.8660

v=8.660-5.0 = 3.66

h= 5.0-8.660 = -3.66

Answer:

Explanation:

Kinetic energy is 1/2mv²

where m is the mass of the object

v is the velocity

From the question

m = 200kg

v = 2.7m/s

Kinetic energy is

1/2 × 200 × 2.7²

= 729 Joules

Hope this helps you

Answer:

a=5m/s

Explanation:

Forces going to the left:  \(F_{3}\)

Forces going to the right: \(F_{1}\) and \(F_{2}\)

To indicate the different directions, let the forces going to the left be negative, and the sign on forces going to the right be positive.

The total forces acting on the system are:

\(F_{1}\) + \(F_{2}\) + \(F_{3}\)

100N + 80N - 30N = 150N

The overall force is therefore 150N going to the right (sign is positive). Now time to find the overall acceleration:

Force = mass * acceleration

150 = 30a

a=5m/s

Answer:

A book containing information on various types of science related topics.

Answer: a science book is a textbook you use for science.

From the table shown we can see that the substance that has a density of 10.50g/cm³ is Silver. Hence the required substance is silver

Density is the ratio of the mass of an object to its volume. Mathematically,

Density = Mass/Volume

Given the following from the question

Mass = 273g

Volume of water = 26mL

Convert the volume to cm³

1ml = 1cm³ Hence;

26mL = 26cm³

Get the density of the object

Density = 273g/26cm³

Density = 10.50g/cm³

Hence the required density is 10.50cm³. From the table shown we can see that the substance that has a density of 10.50g/cm³ is Silver. Hence the required substance is silver

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The force exerted on the rope by the child is 71.8 N.

Weight of the sled holding by the child, W = 82 N

Angle of inclination, θ = 29°

The component of weight acting downwards,

Wx = mg sinθ

Wx = 82 x sin 29°

Wx = 82 x 0.485

Wx = 39.8 N

Given that the surface of the hill is frictionless. So, the force of friction will be zero.

Therefore, force exerted on the rope by the child,

F = mg cosθ

F = 82 cos29°

F = 82 x 0.875

F = 71.8

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The induced current produced due to moving sliding rod having resistance 0.05 is 2.4 A.

Induced current:

Any change in the magnetic field associated with a coil of wire will cause an emf to be induced in the coil. This emf is called induced emf and if the conductor circuit is closed, current will also circulate through the circuit. This current is called induced current.

Given, length of sliding rod, l= 0.1 m

Magnetic field = 0.60T

Velocity = 2m/s

Resistance of the loop = 0.05

Emf Induced = Blv

induced current = Blv/R

\(i = \frac{0.6 \times 0.1 \times 2}{0.05} \)

\(i = \frac{0.12}{0.05} \)

\(i = 2.4\)

so, the current produced in sliding rod moving withspeed of 2m/s in magnetic field 0.6 T and having resistance of loop 0.05, is 2.4 A

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