riding a bicycle and using of wheelbarrow (kariton) are example of
A.fluid friction
B.rolling friction
C.sliding friction
D.static friction​

In order to avoid injury to driver, The force constant of this spring should be 73.82 N/m

Calculation of force constant to this spring:

Here  

vertical drop is 15 m.

mass of the car, m= 113 kg

gravitational acceleration, g= -9.8 m/s^2

spring compression before car stops, x= 3.0 m

In order to avoid injury to the driver,

we need to use Hooke's law and Newton's second law:

F(net) = F(x)

m*a=-k*x

here a=g

k= -(m*g) / x

here k is force constant of this spring

substituting the values we get,

k = -(113* -9.8) / (15)

k = 73.8266 N/m

Hence,  the force constant of this spring should be 73.82 N/m

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Answer:

the level on the top

Explanation:

_+$+$

The speed of the child-sled system after the child jumps onto the sled is 3 m/s.

An object's speed is the rate at which it moves in any direction. Speed is measured as the ratio of the distance travelled to the time required to cover that distance. Speed is a scalar quantity since it only has a direction and no magnitude.

Apply momentum conservation perfect inelastic.

p(before) = p(after)

m1v1i = (m1 + m2)vf

(30)(5) = (50)vf

vf = 3 m/s

Hence, speed of the child-sled system after the child jumps onto the sled is 3 m/s

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The net force on the block parallel to the incline is

∑ F = -mg sin(θ) = ma

where m is the mass of the block, g = 9.8 m/s² is the acceleration due to gravity, θ is the angle the incline makes with the horizontal, and a is the acceleration of the block. Solving for a gives

a = -g sin(θ)

so the block would slide down the incline with acceleration

a = - (9.8 m/s²) sin(30°) = -4.9 m/s²

Answer: The molecules in gases are different from other states of matter

Explanation:

The molecules in gases are different from other states of matter because unlike, for example, a solid, they move around freely and are much more spread apart. A gas can fill up any container, but once the container is unsealed, the gasses will immedietly be let out. Gases can be compressed much more easily than a solid or a liquid.

Answer:

All options presented were applied to the answer.

Explanation:

The sample response presented in the question above, refers to a closed system where two molecules after colliding satisfy the conservation of momentum law, which can also be called the conservation law of linear momentum. This law states that in a closed system the initial state of the components must be maintained and remain the same until the final state, that is, the two molecules maintain their ideal momentum before and after the collision. This means that if they had 1.5 kg • m/s before the collision, this value must be maintained after the collision. All these concepts are presented in the sample response.

Answer:

What did you include in your response? Check all that apply. The law of conservation of momentum is satisfied. The momentum before the collision is 1.5 kg • m/s. The momentum after the collision is 1.5 kg • m/s. The momentum before and after the collision is the same.

Explanation:

The sample response presented in the question above, refers to a closed system where two molecules after colliding satisfy the conservation of momentum law, which can also be called the conservation law of linear momentum. This law states that in a closed system the initial state of the components must be maintained and remain the same until the final state, that is, the two molecules maintain their ideal momentum before and after the collision. This means that if they had 1.5 kg • m/s before the collision, this value must be maintained after the collision. All these concepts are presented in the sample response.

Answer:

No

Explanation:

She will not be able to measure the length of her window accurately due to instrumental error from her choice of instrument. The elastic nature of her tape would alter the measurement because it will stretch as she is taking her readings, thus reducing the true measurement of the length of her window.

To measure the length of her window, she could use an inelastic tape rule or a metre rule. These instruments would eliminate instrumental error.

Light passes straight through two vertical polarizers. The axes of the filters are aligned parallel to each other. The way the light that passes through the second filter compared to the light that passed through the first filter is that all of the light will pass through both polarizers.

A polarizer, also known as a polariser, is an optical filter that allows light waves of one polarization to pass while blocking light waves of other polarizations. It may convert an undefined or mixed polarization light beam into a polarized light beam by filtering it.

Calcite, a naturally occurring mineral, is used to make the majority of birefringent polarizers. Calcite is common in polycrystalline form, but optical-grade calcite is scarce, making birefringent polarizers more expensive than most other varieties.

Remember that polarising filters can lower the amount of light reaching your camera's sensor by up to two or three f-stops, so avoid using them in low-light settings.  This includes photography during blue hour, at night, and when capturing the Aurora Borealis.

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Answer:

•Walking briskly

• Running /jogging

•Dancing

•biking

Answer:

323 m.

Explanation:

The frequency is 640 kHz.

(wavelength) = =

We will now change 640KHz to Hz. This is attainable as follows:

1 KHz = 1000 Hz

Therefore,

640 KHz is equal to 640 KHz 1000 Hz / 1 KHz.

640 kHz = 64×10⁴ Hz

As a result, 640KHz is equal to 64025 Hz.

The following equation connects a wave's wavelength () and frequency (f):

Wavelength x Frequency = Velocity

v = λf

The radio wave wavelength can be calculated using the formula above as follows:

Frequency (f) equals 64 to 104 Hz

The electromagnetic wave's (v) speed is 3 x 108 m/s.

(wavelength) = =

v = λf

3×10⁸ = λ × 64×10⁴

By 64025, divide both sides.

λ = 3×10⁸ / 64×10⁴

λ = 487m

Consequently, the radio wave's wavelength is 487 m.

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Answer:

-5.55 m/s^2

Explanation:

To find the acceleration of the bus, we need to use the formula:

acceleration = (final velocity - initial velocity) / time

Here, the initial velocity of the bus is 80 km/hr, the final velocity is 60 km/hr, and the time taken to change the speed is 5 seconds.

First, we need to convert the speeds from kilometers per hour to meters per second, so that we can use the SI unit of acceleration, which is meters per second squared (m/s^2).

80 km/hr = 80 x 1000 m/3600 s = 22.22 m/s

60 km/hr = 60 x 1000 m/3600 s = 16.67 m/s

Now we can substitute the values into the formula:

acceleration = (final velocity - initial velocity) / time

acceleration = (16.67 m/s - 22.22 m/s) / 5 s

acceleration = -5.55 m/s^2

Therefore, the acceleration of the bus is -5.55 m/s^2.

Note that the negative sign indicates that the acceleration is in the opposite direction of the initial velocity.

Answer:

Assess what information you are given. Use this method if you know:

the total distance covered by one person or vehicle; and

the total time it took that person or vehicle to cover the distance.

Explanation:

Hope this helps! I might be wrong, so tell me if I am

Answer:

Average speed can be calculated by dividing the total distance the object travels by the total amount of time it takes to travel that distance.

Explanation:

This is as much as I can help you, i don't know much else on how to do that ;w; sorry

The given statement "If the radioactivity of a material is not known, the half-life cannot be determined" is (b). false statement because half-life, in radioactivity, is the amount of time needed for half of a radioactive sample's atomic nuclei to decay.

Or, alternatively, the amount of time needed for a radioactive material's rate of disintegrations per second to decrease by half. Cobalt-60, a radioactive isotope used in radiotherapy, has a half-life of 5.26 years, for instance. As a result, after that time, a sample that contained 8 g of cobalt-60 at first would only have 4 g of cobalt-60 and would produce half as much radiation. Only 2 g of cobalt-60 would remain in the sample after an additional delay of 5.26 years.

However, neither the volume nor the mass of the initial sample are shown to decrease because when cobalt decays, unstable cobalt-60 nuclei turn into stable nickel-60 nuclei, which stay with the cobalt that hasn't yet broken down.

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Answer:

I think D

Explanation:

If normal range of motion of the shoulder is not possible and the attempt causes the shoulder to shrug or hike, the injury is likely a rotator cuff tear.

When the normal range of motion of the shoulder is restricted, and attempting to move the shoulder causes it to shrug or hike, it is indicative of a potential rotator cuff tear.

The rotator cuff is a group of muscles and tendons that surround the shoulder joint, providing stability and facilitating movement. It helps to keep the head of the upper arm bone (humerus) securely within the shoulder socket.

A rotator cuff tear can occur due to various reasons, such as trauma, repetitive motion, or degeneration with age. When a tear occurs, it can lead to pain, weakness, and limited range of motion in the shoulder.

The inability to move the shoulder through its normal range without causing shoulder shrugging or hiking suggests that the rotator cuff's integrity is compromised.

It is important to consult a healthcare professional for a proper diagnosis and appropriate treatment of a suspected rotator cuff tear. Treatment options may include rest, physical therapy, medication, or in severe cases, surgical intervention.

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In order to find the magnitude of the electric field at the origin, you need to use the equation E = q/4πεr², where q is the charge, ε is the permittivity of space, and r is the distance from the origin.

To calculate the electric field, you must first determine the charge of the particle, then determine the distance to the origin, and finally, use the equation to calculate the magnitude of the electric field.

Once you have the magnitude of the electric field at the origin, you can then use it to explore the behavior of other electric fields in the area.

To calculate the magnitude, you must first determine the values of k, q, and r, then plug them into the equation and solve. The resulting answer will be the magnitude of the electric field at the origin.

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Answer:

Explanation:

The frequency is 16.0 Hz. That means that 16 of these waves can pass a single point in 1 second. We are given frequency and wavelength. The equation that relates them is

\(f=\frac{v}{\lambda}\) where f is frequency, v is velocity, and λ is wavelength. Putting all this together:

\(16.0=\frac{v}{97.5}\) and solving for velocity,

v = 16.0(97.5) so

v = 1560 m/s. This wave can travel 1560 meters in a single second!!! Now that we know this velocity, we can use it in a proportion to find our unknown, which is how long, t, it will take to hear this sound 11000m away. (11 km is 11000m):

\(\frac{1560m}{1s}=\frac{11000}{t}\) and cross multiply to get

1560t = 11000 so

t = 7.1 seconds

Answer:

low angle     n₁ sin θ₁ = n₂ sin θ₂

critical angle    sin θ₁ = \(\frac{n2}{n1}\)    θ₁ = θ_{reflected}

Explanation:

When the light ray touches the two surfaces of the refraction according to the Law of Refraction

           n₁ sin θ₁ = n₂ sin θ₂

In this problem the ray goes from the material with the highest index to the lowest index, in the middle of the incident it has the subscript 1

           sin θ₂ = \(\frac{n_1}{n_2}\) sin θ₂

What

           n₁/n₂> 1

in refracted ray it moves away from normal.

As the incident angle increases, a value is reached where sin θ₂ = 1, for this angle

            sin θ₁ = \(\frac{n2}{n1}\)

This angle is called critical and as the sine function cannot have values greater than 1, the ray is reflected, therefore it must comply with the law of reflection where the incident angle is equal to the reflected angle.

Answer:

a & b

the others don't make sense

The two statements about digital data true are

computer.

Digital information generally consists of data that is created or prepared for electronic systems and devices such as computers, screens, calculators, and communication devices. These information are stored by cloud.

Data is different from information because data is not yet processed but information is processed.

The two statements about digital data true are

computer.

Thus, the correct options are A and B.

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Answer:

2.27kg

Explanation:

The Potential energy gained = Force gravity× Height

Force gravity on the ball is GPE/ height

56.8/2.5=22.72N

the mass = 22.72/10= 2.27kg

The mass of the ball when the gravitational potential energy of 56.8 J present is 2.27 kg.

The potential energy is the energy by virtue of its position in the effect of gravity.

Given is an exercise ball is on a table 2.5 m above the ground. It has a gravitational potential energy of 56.8 J.

Potential energy = gravity force × height

P.E =mgh

56.8 J = m x 9.8 x 2.5

m = 2.27kg

Thus, mass of the ball is 2.27 kg.

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Answer:

wavelength = 2.5 m

Explanation:

λ=. v/f

= \(\frac{150m/s}{60Hz} = 2.5m\)

Answer: B. Only the mass of the planet

Explanation:

the confusion on the concepts of mass and weight arises from the fact that the acceleration due to gravity is more or less constant in any place on the Earth's surface, thus the weight of an object is directly proportional to its mass. hope it helps <3

Vega is a main-sequence star of spectral type A, with a mass of about 2.1 times that of the Sun. As a main-sequence star, Vega is burning hydrogen in its core to produce energy, and it will continue to do so for several billion years.

After it exhausts the hydrogen in its core, Vega will enter a new phase of its life known as the red giant phase. During this phase, Vega will expand to become a much larger star, with a radius that may be several hundred times larger than its current radius. The outer layers of Vega will cool and become less luminous, causing the star to appear redder in color.

As the red giant phase progresses, the core of Vega will contract and heat up, eventually becoming hot enough to fuse helium into heavier elements. This process will release a large amount of energy, causing the outer layers of the star to be blown away in a massive explosion known as a planetary nebula. The hot, compact core that remains will eventually cool down and become a white dwarf, the final stage of stellar evolution for stars like Vega.

So, Vega is expected to expand into a red giant star before evolving into a white dwarf.

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The statement " The effective capacity utilization can be smaller than the design capacity utilization." is True because design capacity utilization refers to the maximum utilization of the system's capacity under ideal conditions.

Effective capacity utilization refers to the actual utilization of a system's capacity, taking into account factors such as downtime, maintenance, and other operational constraints. On the other hand, design capacity utilization refers to the maximum utilization of the system's capacity under ideal conditions.

In practice, it is common for the effective capacity utilization to be smaller than the design capacity utilization. This occurs due to various factors that affect the actual production or service delivery. These factors can include equipment breakdowns, scheduled maintenance, employee absenteeism, supply chain disruptions, and variations in customer demand.

The effective capacity utilization considers the real-world operational conditions and takes into account the constraints and limitations that can impact the system's performance. Therefore, it is not uncommon for the effective capacity utilization to be lower than the design capacity utilization, which represents the theoretical maximum utilization achievable under ideal circumstances.

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