A wave moves along a slinky with a speed of 0.75 m s1.
The wave travels the full length of the slinky in 3.2 s.
Calculate the length of the slinky.

Answer:

its D

Explanation:

i just got it correct on a. p. e. x. :)

Answer:

8125 Pa

Explanation:

Pressure exerted= Force/ area of contact

we calculate the force he is excerting = mg

= 75 X 10

= 750N

Pressure exerted while standing= 750/0.08

= 9375 Pa

pressure exerted while laying down = 750/0.6

= 1250 Pa

the difference in pressure= 9375 - 1250

= 8125 Pa.

The angle the string makes with the vertical is : 34.6°

Given data :

mass of rubber stopper ( m ) = 45 g

Radius ( r ) = 2.9 m

Time to complete one revolution ( T ) = 4.1 secs

applying the formula below

Tan ∅ = \(\frac{mw^2r}{mg}\) --- ( 1 )

cancel out m from equation ( 1  )

Tan ∅ = \(\frac{w^2r}{g}\)    ----- ( 2 )

where ; w = \(\frac{2\pi }{T}\)  

Therefore equation ( 2 ) becomes

Tan ∅ = \(\frac{4\pi ^2r}{T^2g}\)   --- ( 3 )

where ; r = 2.9 m, T = 4.1 secs , g = 9.8

Insert values into equation ( 3 )

Tan ∅ = 0.69

      ∅ = Tan ( 0.69 )

         = 34.6°

Hence we can conclude that The angle the string makes with the vertical is : 34.6°.

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Yes, copper is a good conductor of heat.

Copper is a good conductor of heat along with silver, aluminum etc.  What makes copper a good conductor of heat is that it has free electrons moving inside it. The electrons can move freely through it which makes transfer of heat and its dissipation faster. The free electrons makes the conduction of heat and electricity possible. These electrons are called conduction electrons.

That's why copper is used in many cooking utensils, fuses and as a heat sink in electrical appliances. It is a good conductor of electricity also.

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Answer:

6.39×10^23 kg is the weight on mass

Solids have a distinct volume and form. Although they have a specific capacity, liquids adopt the form of a container. Gases lack a distinct volume or form.

Gas is a sample of matter that adopts the shape of the container in which it is housed and develops a uniform density inside the container.

a)Particle motion

Liquid molecules are more energetic than solid molecules. Further heating will cause the molecules to move so quickly that they won't stick together at all. The gas molecules have the highest energy content.

b)Shapes

Solids are discrete in their shape and volume. Although they take on the shape of the container, liquids have a specific volume. The form and volume of gases are ambiguous.

c)Compressibility

The solid or liquid's constituent atoms, ions, or molecules are in close proximity to one another.

The greater compressible nature of gases compared to liquids or solids is explained by the kinetic-molecular hypothesis.

Hence solids, liquids, and gases differentiate in terms of particle motion, shape, and compressibility.

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Answer:

In a solid, atoms vibrate or wiggle, but are locked in place. Solids have a rigid shape, and are hard to compress. In a liquid, atoms have some freedom to move. Liquids take the shape of their container, and are hard to compress. In a gas, atoms move freely. Gases have no definite shape, and are easy to compress.

Explanation:

Use the formula for momentum:  Momentum = (mass) x (speed)

2.67 x 10⁴ kg-m/s  =  (mass) x (8.9 m/s)

Mass  =  (2.67 x 10⁴ kg-m/s) / (8.9 m/s)

Mass  =  3,000 kilograms

That's 3 metric tons.  On Earth, it weighs 6,614 pounds, or 3.3 US tons.

It probably performs a lot like my car.

Answer:

The greatest force of gravity on the ball will occur at the point when the ball is near to hit the ground

Explanation:

We know that the earth's center attracts everything towards its center with an acceleration of 9.8 m/s² so it simply means that the change in velocity must occur to produce acceleration. When the ball comes towards the earth, its speed  continuously increases and it is at maximum level when it is about to hit the ground so this is the point where gravitational force is maximum.

I hope this helps ^_^

If the muscles were resistors, then expanding the muscles would increase the resistance and lessen the susceptibility to electrical shock. The correct option is (4).

What is electrical shock?

Muscles as Resistors:

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Answer:

Inverse relationships are common in nature. In electrostatics, the electrical force between two charged objects is inversely related to the distance of separation between the two objects. Increasing the separation distance between objects decreases the force of attraction or repulsion between the objects.

Explanation:

Two ways to decrease the electric force between two charged objects:

As a result of their electric charge, particles or objects are attracted to or repelled by the Coulomb force, also known as electrostatic force or Coulomb interaction. Charles-Augustin de Coulomb, a French scientist who published the findings of an experimental inquiry into the proper quantitative description of this force in 1785, gave the electric force its name. The electric force is one of the fundamental physical forces.

Positive or negative electric charges that are similar to one another repel one another in a straight line between their centers. Positive and negative charges that are opposite each other are drawn together along a straight line connecting their centers.

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Answer:

don't know sorry for the irreverent answer..

Answer:

The index of refraction varies with frequency, it doesn't change as light travels from one medium to another, As violet colour has the shortest wavelength and so the refractive index is maximum for it.

Ranked from highest to lowest according to dielectric constant:

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Answer:

Crop rotation is the practice of growing a series of different types of crops in the same area across a sequence of growing seasons. It reduces reliance on one set of nutrients, pest and weed pressure, and the probability of developing resistant pest and weeds

Answer:

Average acceleration = 0.45 m/s²

Explanation:

Given the following data;

Initial velocity, u = 0m/s

Final velocity, v = 8.6 m/s

Time, t= 19 seconds

To find the average acceleration;

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of final speed from the initial speed all over time.

Mathematically, acceleration is given by the formula;

\(Acceleration = \frac{initial speed - final speed}{time}\)

Substituting into the formula, we have;

Acceleration = (8.6 - 0)/19

Acceleration = 8.6/19

Average acceleration = 0.45 m/s²

Answer:

James Clerk Maxwell

Who observed and discovered the electromagnetic field concept? Many physicists experimented with electromagnetic fields, but it was James Clerk Maxwell who discovered that they are actually electromagnetic in nature and they (at the classical level) are accurately described by his famous equations.

Explanation:

The net force acting on the crate is determined as 176 N to the left.

The net force acting on the crate is calculated as follows;

∑F = F1 + F2 + F3 + F4

F(net) = -440y + 176x + 440y - 352x

F(net) = -176 x

The resultant force is pointing in negative x direction.

Thus, the net force acting on the crate is determined as 176 N to the left.

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This experiment help us understand their behavior as well as how the people will cop up with the rules and regulation the society wants to apply on them

In a two-week simulation of a prison setting, the Stanford prison experiment was meant to look at the impact of situational factors on participants' responses and behaviors.

Hence, this experiment allows us to better understand their behavior, as well as how individuals will respond to the laws and regulations imposed by society.

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Although the video is not found here, the sentence makes reference to the transmission spectrum of colored filters.

The transmission spectrum indicates the light portion having a given wavelength that can be passed through a filter.

This spectrum (transmission spectrum) depends on the physical separation of the particles that form the filter.

In conclusion, although the video is not found here, the sentence makes reference to the transmission spectrum of colored filters.

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Answer:

0.248 m

Explanation:

Answer:

When an object moves in a straight line at a steady speed, we can calculate its speed if we know how far it travels and how long it takes. This equation shows the relationship between speed, distance traveled and time taken: Speed is distance divided by the time taken.

Explanation:

Thats what goog.le said so if its wrong blame G O O G L E

The distance from the axis of the force applied is 2.05 m.

The distance from the axis of the force applied is calculated as follows;

The formula for torque;

τ = Fr

where;

Another formula for torque is given as;

τ = Iα

where;

τ = (mr²)α

τ = (25 kg x (0.925 m)²) x (1.84 rad/s²)

τ = 39.36 Nm

The distance is calculated as;

r = τ/F

r = ( 39.36 Nm ) / (19.2 N)

r = 2.05 m

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Answer:

When you moved the compass near a bar magnet, the needle pointed toward the magnet's magnetic field and not toward the north.

Explanation:

Answer:

i dont really know

Explanation:

sorry :(

Answer:

Hibernation allows the animal to survive when food is scarce.

Explanation:

in spring they need food to survive

If a rod is free to slide on a frictionless sheet of ice and one end is lifted by a string, the angle of the string would be a right angle in order to maintain the rod at rest.

This is because in order for an object to be at rest, the forces acting on it must be balanced. In this case, the only forces acting on the rod are the force of gravity pulling the rod down and the force of the string pulling the rod up. If the string is at a right angle to the rod, the forces will be balanced and the rod will remain at rest.

If the string were at an acute angle (less than 90 degrees), the force of the string would not be strong enough to balance the force of gravity, and the rod would slide down. If the string were at an obtuse angle (greater than 90 degrees), the force of the string would be too strong and the rod would be pulled off the sheet of ice.

Therefore, the angle of the string must be a right angle in order to maintain the rod at rest on the frictionless sheet of ice.

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17.01 m/s is the car’s velocity .

s=ut+at²/2

s-at²/2=ut

u=s-at²/2÷t

u=312/18.4

u=17.01 m/s

"The rate at which an item changes its location" is described by a vector number called velocity. Imagine someone walking swiftly, one step forward, one step back, and starting each step from the same location. Velocity is a vector quantity. Therefore, velocity is cognizant of direction. The direction must be taken into account when determining an object's velocity. A velocity of 55 miles per hour is not adequate information. It is necessary to account for the direction in order to accurately describe the object's velocity. Simply put, the direction of the velocity vector represents the motion of the object.

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The tension T in the rope is 163.13lb and the linear velocity of the chair and rider is 36.25ft/s.

Given the vertical angle of inclination (θ) = 65°

The length of the rope (L) = 40ft

The combined weight of rider and chair (W) = 180lb

Let the tension in the rope = T

The linear velocity of the rope = v

Tension in the rope is calculated as:

T = mgsinθ such that W = mg

T = (180lb) x (sin 65°) = 163.13 lb

Linear velocity of the chair and rider (v):

v = (L) x (2πr) / mg = 2πrL/W where r is the radius of circle formed.

r = (40 ft) / (2π) = 6.37 ft

v = (163.13 lb) x (2π x 6.37 ft) / (180 lb) = 36.25 ft/s

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What What What What...... error

Answer:

Approximately \(3.01 \times 10^{-27}\; {\rm m}\) (when measured in a vacuum.)

Explanation:

Apply unit conversion and ensure that the mass of the baseball is in standard units (kilograms):

\(m = 145\; {\rm g} = 0.145\; {\rm kg}\).

The kinetic energy of the baseball will be:

\(\displaystyle E = \frac{1}{2}\, m\, v^{2}\),

Where \(v = 30.2\; {\rm m\cdot s^{-1}}\) is the speed of the baseball.

\(\begin{aligned}E &= \frac{1}{2}\, m\, v^{2} \\ &= \frac{1}{2}\, (0.145)\, (30.2)^{2}\; {\rm J} \\ &= 66.12290\; {\rm J}\end{aligned}\).

The energy of a photon of frequency \(f\) is:

\(E = h\, f\),

Where \(h \approx 6.62607 \times 10^{-34}\; {\rm m^{2}\cdot kg \cdot s^{-1}}\) is Planck's constant.

When measured in a vacuum where speed of light is \(c \approx 3.00 \times 10^{8}\; {\rm m\cdot s^{-1}}\), the wavelength \(\lambda\) of this photon will be:

\(\displaystyle \lambda = \frac{c}{f}\).

\(\displaystyle f = \frac{c}{\lambda}\).

Hence, the expression for the energy of this photon can be rewritten as:

\(\displaystyle E = h\, f = \frac{h\, c}{\lambda}\).

Rearrange this equation to find \(\lambda\):

\(\displaystyle \lambda &= \frac{h\, c}{E}\).

Assuming that the energy of this photon to be equal to the kinetic energy of that baseball, \(66.12290\; {\rm J}\):

\(\begin{aligned}\lambda &= \frac{h\, c}{E} \\ &\approx \frac{(6.62607\times 10^{-34})\, (3.00 \times 10^{8})}{(66.12290)}\; {\rm m} \\ &\approx 3.01 \times 10^{-27}\; {\rm m}\end{aligned}\).