An athlete wants to refill an old punching bag used for training, as shown in the picture. When refilled, the bag will rip if it is kicked with too much force

The wavelength of an electromagnetic wave is inversely proportional to its frequency. This means that as the frequency of an electromagnetic wave increases, its wavelength decreases proportionally.

This relationship is described by the equation:

c = λν

where c is the speed of light, λ is the wavelength, and ν (nu) is the frequency. This equation shows that as the frequency increases, the wavelength must decrease to keep the speed of light constant.

This phenomenon can be observed in various electromagnetic waves. For example, visible light with a higher frequency appears more violet, while light with a lower frequency appears more red. Similarly, higher frequency radio waves have shorter wavelengths and can carry more data than lower frequency radio waves.

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Answer:

hopr

Explanation:

Answer:

How do u delete your questions on this app

Given,

The extension of the spring due to the attached mass, x=1.24 m

The spring constant, k=330 N/m

The weight of a mass m is given by,

Where g is the acceleration due to gravity,

The magnitude of the restoring force of a spring is given by,

Therefore,

On substituting the known values,

Thus the mass of the weight is 41.76 kg

In each of the following cases, work is done as follows:

What is work?

Work is a term used in physics to describe the transfer of energy from one system to another. Work is done when a force is applied to an object, causing it to move a certain distance in the direction of the force.

a) A physics student works tirelessly on this homework assignment: No work is done in this scenario as work is defined as the transfer of energy from one system to another. Writing a homework assignment does not involve the transfer of energy from one system to another.

b) An elevator takes you from the 1st to the 3rd floor of Suncoast, and returns to the 1st floor: Work is done in this scenario as the elevator moves against the force of gravity, lifting the people and its own weight from the 1st to the 3rd floor, and then back to the 1st floor.

c) A link pulls a block 10 m across the floor of a temple at constant speed: Work is done in this scenario as the link exerts a force on the block, causing it to move in the direction of the force, covering a distance of 10 m.

d) A guy pushes the wall with all his strength: No work is done in this scenario as work is defined as the transfer of energy from one system to another. Pushing the wall does not result in the transfer of energy from one system to another, and the wall does not move.

e) A student picks up a textbook from the ground: Work is done in this scenario as the student lifts the textbook against the force of gravity, causing the textbook to gain potential energy.

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Answer:

The resistance of the circuit is 0.\(\bar 3\) Ω

Explanation:

The given parameters are;

The voltage the charger produces = 14.5 Volts

The current flow of the charger = 43.5 Amps

Therefore, the resistance of the circuit, R = Voltage V/(Current, I)

R = V/I = 14.5/43.5 = 1/3 = 0.\(\bar 3\) Ohms

The resistance of the circuit = 0.\(\bar 3\) Ohms

Which can be written with the symbol for the unit of resistance Ω as follows;

The resistance of the circuit = 0.\(\bar 3\) Ω.

Answer:

The initial vertical velocity is the vertical component of the initial velocity: v0y=v0sinθ0=(30.0m/s)sin45°=21.2m/s.

Explanation:

Time taken by arrow to reach height point is 2.2 seconds

Given:

Initial velocity of arrow = 22 m/s

Find:

Time taken by arrow to reach height point

Computation:

We know that, highest point stands when final velocity is 0 m/s

So,

Final velocity = 0 m/s

Gravitational acceleration = 10 m/s²

So,

v = u + at

0 = 22 + 10(t)

10t = -22

t = -22 / 10

t = -2.2 second

Time taken = 2.2 seconds

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Answer:

Es la energía cinética interna total de un objeto debido al movimiento aleatorio de sus ... a es la energía que posee un objeto o cuerpo en virtud del movimiento de sus ... Si el movimiento de estas moléculas y átomos es más rápido, se dice que el ... Por lo tanto, la energía térmica asociada con la conducción resulta de la .

Explanation:

The probability that X = 8, meaning there are 8 kids between Izzy and Lizzy in line, is \(\frac{(2\times 8{\displaystyle !\,})}{10{\displaystyle !\,}}\).

For the probability that X = 8, we need to consider the number of possible arrangements where Izzy and Lizzy are separated by 8 kids out of the total 10 kids.

The total number of possible arrangements of the 10 kids in line is \(10{\displaystyle !\,}\), as there are 10 positions to fill.

Now, out of the 10 positions, we need to choose 2 positions for Izzy and Lizzy, and since the order of Izzy and Lizzy doesn't matter, we multiply by 2. So, the number of arrangements with Izzy and Lizzy fixed in two positions is \(2 \times 8{\displaystyle !\,}\).

Therefore, the probability that X = 8 is given by \(\frac{(2\times 8{\displaystyle !\,})}{10{\displaystyle !\,}}\).

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The complete question is:

10 kids are lined up in random order. One of the kids is named Izzy and another of the kids is named Lizzy. Let X be the random variable that denotes the number of kids in between Izzy and Lizzy in line. What is the probability that X = 8?

A. 0

B. \(\frac{(2 \times 8{\displaystyle !\,})}{10{\displaystyle !\,}}\)

C. \(\frac{2}{10{\displaystyle !\,}}\)

D. \(\frac {8{\displaystyle !\,}}{10{\displaystyle !\,}}\)

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 ^_^

Answer:

The kinetic energy decreases.

Explanation:

Friction is defined as a opposite force to motion. If friction is the only force acting on an objects, its kinetic energy decreases.

It is so because due to resistive force or friction, kinetic energy is converted to heat energy and that reduces the total kinetic energy in the system.

Hence, the correct answer is "The kinetic energy decreases."

The assumptions must be made base in the object’s kinetic energy in a situation whereby frictional force is the only force acting on an object is A:The kinetic energy decreases.

Therefore, option A is correct.

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Answer:

d= 45 m

Explanation:

speed = distance / time

15= d/ 3

d= 45 m

The diverging lens/concave lens is used as a corrective lens is used for a nearsighted person

Nearsightedness is also known as myopia where the person with myopia will be able to see the near object but far objects will look blurry.

Myopia is corrected with lenses called "minus power lenses". They are concave in shape and help the eye to focus light properly. Myopia causes distant objects to appear blurry. Prescription glasses or contact lenses can usually correct this blurry distance vision. Myopic eyes have a stronger ability to focus than normal eyes. Focus in front of the retina, not on the retina. Lenses used to correct nearsightedness work by reducing the eye's ability to focus.

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Answer:

I think it's potential energy

If you pull yourself to the center of the merry-go-round,  the rotation of the merry go round will decrease.

This is the radial acceleration experienced by a person moving in a circular path as the merry-go-round rotates about its mean position.

a = v²/r

where;

From the formula given above, as the radius of the merry go round increases, the centripetal acceleration of the merry go round decreases.

v = ωr

where;

Thus, when the radius of the circular path decreases, the speed of the merry go round will decrease as well.

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Answer:

(1)540 J

(2)67.5 J/s or 67.5W

(3)look at underline statement in explanation

Explanation:

(1) acceleration = change in speed ÷ time

= (9-5)m/s ÷ 8s

= 0.50 m/s²

resultant force of object during motion

= mass(in kg) × acceleration

= 6 × 0.50 = 3 N

displacement of force applied

= area under speed time graph(when sketched out, it's a trapezium)

= ½ × (5+9) × 8

= 180m

work done is measured in joules

= force × displacement of force applied

= 3N × 180m

= 540 J

detailed explanation:

altho the final unit for the work done should be Nm, but J is equal to Nm.

(2) Power is measured by J/s

therefore power = 540 J ÷ 8s = 67.5 J/s or 67.5 W

(3) the object accelerates constantly along a straight road

Answer:

Earth's core is important for three main reasons: (1) it is responsible for the generation of Earth's magnetic field; (2) it contains information regarding the earliest history of accretion of the planet; and (3) thermal and compositional features established when the core formed have largely controlled the subsequent

Answer:

Earth's core is important for three main reasons:

(1) it is responsible for the generation of Earth's magnetic field;

(2) it contains information regarding the earliest history of accretion of the planet; and

(3) thermal and compositional features established when the core formed have largely controlled the subsequent evolution of the core and also influence the evolution of the mantle, crust, and atmosphere

It take the marble  0.57 second to hit the ground.

A body's velocity is the rate at which its displacement alters with respect to time. A vector quantity with both magnitude and direction is velocity. The meter/second unit of measurement for velocity.

Given that the horizontal velocity of the marble is: u = 8.00 m/s.

Height of the place: H = 1.60 m.

As their has no initial vertical component of velocity; time taken by the marble to reach the ground: t = √(2H/g)

= √(2×1.60/9.8) second

= 0.57 second.

Hence, time taken to reach ground is 0.57 second.

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Answer:

none of the above or screwdriver

The power gain when the gain falls by 3 dB is approximately 300.7 mW, which is closest to option D: 244.2 mW.

The power gain of an amplifier can be calculated using the formula:

Power Gain (dB) = 10 * log10(Pout / Pin)

where Pout is the output power and Pin is the input power. In this case, the midrange gain of the amplifier is given as 600 mW.

To calculate the power gain when the gain falls by 3 dB, we need to find the new output power. Since the gain is decreasing, the new output power will be lower than the initial power.

First, we convert the midrange gain from milliwatts to watts:

Midrange Gain = 600 mW = 0.6 W

Next, we use the formula:

Pout / Pin = 10^(Power Gain / 10)

Since the gain falls by 3 dB, the new power gain is:

Power Gain = -3 dB

Now we substitute the values into the formula:

Pout / Pin = 10^(-3 / 10)

Pout / Pin = 10^(-0.3)

Pout / Pin = 0.5012

To find the new output power (Pout), we multiply the input power (Pin) by the ratio:

Pout = Pin * 0.5012

Pout = 0.6 W * 0.5012

Pout = 0.3007 W

Finally, we convert the output power back to milliwatts:

Pout = 0.3007 W = 300.7 mW

Therefore, the power gain when the gain falls by 3 dB is approximately 300.7 mW, which is closest to option D: 244.2 mW.

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Answer: 0.25 m/s

Explanation:  Speed = wavelengt · frequency  

v = λf   and frequency is 1/period  f = 1/T

Then v = λ/T = 5 m / 20 s = 0.25 m/s

Explanation:

everything can be found in the picture

Answer:

a is the correct answer

Explanation:

period T=1/f

where f=60hertz

then T= 1/60 which give 0.01666666 but putting it in standard form and rounding up give 1.7×10^-2

Answer:

repel , attract,l am sure with these two blanks only

Answer:

Magnetic fields

A magnet creates a magnetic field around it. You cannot see a magnetic field, but you can observe its effects. A force is exerted on a magnetic material brought into a magnetic field. The force is a non-contact force because the magnet and the material do not have to touch each other.

Answer:

The volume of 1600 kg of petrol is 1600/800 = 2 m^3. As the density of lead is 11400 kg/m^3, the mass of 2 m^3 is 11400*2 = 22800 kg. The mass of lead with the same volume as 1600 kg of petrol is 22800 kg.

Answer:

The force applied to make the object move

Answer:

input work = output work

E * ED = L* LD

Explanation:

The principle of lever is that input work is always equal to output work .

Answer:

Explanation:

if u just look at it yk u can see it

Answer:

I believe the answer would be kinetic energy to thermal energy.

Explanation:

Thermal energy is the heat of the brakes, and the kinetic energy would be when the car is in motion before stopping.

Answer:

A) 20.8 m/s

B) h_max = 11 m

Explanation:

A) Formula for projectile range is;

R = (u²sin2θ)/g

We want to find initial velocity, so let's make u the subject.

u = Rg/sin2θ

We are given;

R = 44 m

θ = 45°

Thus;

u = √[(44 × 9.8)/sin 2(45)]

u = √[431.2/sin 90]

u = 20.77 m/s ≈ 20.8 m/s

B) maximum height will be gotten from the formula;

h_max = (R tan θ)/4

h_max = (44 × tan 45)/4

h_max = (44 × 1)/4

h_max = 11 m

The value of force is 1.7 × 10⁻³ N, with the direction opposite to that of the bat's motion.

When an object collides with another object, they exchange energy. For example, a baseball and bat collision or a car collision. When two objects collide, the force of the collision has to be equal on both sides of the collision according to Newton's Third Law. So, to find the value of force, we will apply the equation:

F = ΔP / ΔT

where F is the force, ΔP is the change in momentum, and ΔT is the time of collision. The equation represents the impulse momentum theorem.

Now, let's apply the given values to the above equation.

Final momentum (p2) = mass × final velocity (v2)

p2 = 0.15 kg × (-50 m/s)

p2 = -7.5 kg.m/s

Initial momentum (p1) = mass × initial velocity (v1)

p1 = 0.15 kg × (40 m/s)

p1 = 6 kg.m/s

Change in momentum (ΔP) = p2 - p1

ΔP = -7.5 kg.m/s - 6 kg.m/s

ΔP = -13.5 kg.m/s

Time of collision (ΔT) = 8.0 × 10³ s

Now, putting the values of ΔP and ΔT in the equation of impulse momentum theorem, we get:

F = ΔP / ΔT

F = -13.5 kg.m/s ÷ 8.0 × 10³ s

F = -1.7 × 10⁻³ N

Thus, the value of force is 1.7 × 10⁻³ N, with the direction opposite to that of the bat's motion.

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