the velocity (v) of dimension of a, b and c.
​

Answer:

a) >26.7 N

b)  >13.3 N

Explanation:

a)  Fg = (17 kg)(9.8 m/s²) = 166.6 N

Fnormal = Fg = 166.6 N

Ff = μFn = 0.16(166.6 N) = 26.7 N

Janitor needs to push >26.7 N to overcome the Force of friction (Ff) on a horizontal floor.

b)  You have to determine Fn on the object by figuring out the y-component of Fg.

Fn/Fg = sin30

Fn = sin30(166.6 N) = 83.3 N

Now you can find Ff.

Ff = μFn = 0.16(83.3 N) = 13.3 N

Janitor needs to push >13.3 N down the incline to overcome Ff

Makes sense that he has to push less down an incline.

Answer:

The first person will gain more velocity as a result of recoil.

Explanation:

Let us recall that from Newton's third law of motion, action and reaction are equation and opposite. A consequence of this law is the proposition that ''momentum can neither be created nor destroyed.''

Hence, when two people who have the same mass, throw two different objects at the same velocity but the first object is heavier than the second, the first object possesses greater momentum than the second object hence the first person will gain more velocity as a result of recoil.

Answer:

The influence of Media and Information over elections, politics and, governance.    

Explanation:

Once we used to have politicians travel to interact with citizens and meet them face to face. That is slowly fading away in place of townhalls that take place online.

Video conferencing, video calls, social media apps, and technology now make it easy to connect with a lot of people at once, across various timezones, without changing location.

Once upon a time, the Television media, Radio Media, Cable Television (all categorized as traditional media) used to be the custodian of information, hence, the chief influencers of politics and governance.

Today, the internet has made it possible for individuals or a group of people without much tech-spend to set up and garner a following that has enough power to influence governance.

Online petitions and Wikileaks, the proliferation of terrorist organizations that have strong information and technology as well as social media skills have modified forever, the way public office holders and other stakeholders involved used to look at governance.

To increase the time the athletes are made to fall either on a cushioned bed or sand bed

In order to increase the time of the athlete's fall to stop after making the jump. This decreases the rate of change of momentum and hence the force.

In a high jump athletic event, the athletes are made to fall either on a cushioned bed or sand bed to to increase the time of the athlete's fall to stop after making the jump . If the time elapsed increases , the force will decrease . Due to decreases of the rate of change of momentum , the force will decrease .

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Answer:

Three forms of energy when a match is being lit are potential, kinetic and thermal.

hope this helps! :)

Explanation:

Answer:

Potential Energy

Kinetic Energy

Thermal Energy

Explanation:

Answer:

A. New space missions show that Pluto is much larger than originally thought.

Explanation:

The new definition of a planet that was adopted in 2006, defined planet as  an object that orbits the sun, with sufficient mass to be round, not a satellite of another object, and has removed debris and small objects from the area around its orbit.

This new definition of a planet that was adopted in 2006, classified Pluto as "dwarf planet", because Pluto meets planetary criteria except that it has not cleared debris from its orbital neighborhood.

However, new Horizons spacecraft flew by Pluto in 2015, revealed that Pluto is much larger than originally thought

Therefore, the correct option is "A"

A. New space missions show that Pluto is much larger than originally thought.

Answer: it means that we now technically have over 100 planets

Explanation:

it’s not New space missions show that Pluto is much larger than originally thought!!!

Answer:

 v = 29.4 m / s

Explanation:

For this exercise we can use the conservation of mechanical energy

Lowest starting point.

          Em₀ = K = ½ m v²

final point. Higher

          \(Em_{f}\) = U = m g h

Let's use trigonometry to lock her up

          cos 60 = y / L

          y = L cos 60

Height is the initial length minus the length at the maximum angle

           h = L - L cos 60

           h = L (1- cos 60)

energy is conserved

         Em₀ = Em_{f}

          ½ m v² = mgL (1 - cos 60)

         v = 2g L (1- cos 60)

let's calculate

          v² = 2 9.8 3.0 (1- cos 60)

          v = 29.4 m / s

Answer:

There are no options, so....

Explanation:

Chlorophyll a absorbs its energy from the Violet-Blue and Reddish orange-Red wavelengths, and little from the intermediate (Green-Yellow-Orange) wavelengths.

A vector's length is considered to be its magnitude. A is used to represent the vector's magnitude.

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The angle measured anticlockwise from the +x axis can be used to find vector components as well. In that instance, the x-component and y-component, respectively, will always be cos and sin.

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The electron number cannot be used instead because electrons can be removed from or added to an atom (option C)

The element of an atom is determined by its proton count, while the electron count can exhibit variability. Take, for instance, a sodium atom, which encompasses 11 protons and 11 electrons. However, it has the capacity to relinquish one electron, transforming into a sodium ion housing only 10 electrons.

This occurs due to the relatively loose binding of electrons to the nucleus, enabling their removal through the influence of an electric field or alternative mechanisms.

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Convert into each other and both are energy are 2 similarities between potential energy and kinetic energy .

Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is squeezed or extended, its potential energy increases. If a steel ball is lifted above the ground as opposed to falling to the ground, it has higher potential energy. It is capable of performing more work when raised. Potential energy is a characteristic of systems rather than of particular bodies or particles; for instance, the system made up of Earth and the elevated ball has greater potential energy as they get further apart.

Potential energy develops in systems having components whose configurations, or relative positions, determine the amount of the forces they apply to one another.

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The potential energy is at the maximum when you reach the top of your jump on a trampoline. The correct answer is option B.

Potential Energy is the type of energy an object possesses by virtue of its position relative to others, stresses within itself, electric charge, and other factors. Potential energy exists in various forms, including gravitational potential energy, elastic potential energy, chemical potential energy, and electrical potential energy.

This type of energy can be converted into another type of energies. Examples, a charged battery has potential energy and it can be used as electrical potential energy. Petrol, diesel and and gas have chemical potential energy and be used as kinetic energy.

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In a distance time graph motion in a negative direction is represented by segments with negative slope. Then in this case the motion in a negative direction is represented by the segment BC.

Explanation:

Distance and amount of charge are factors that determine which of the

following quantities?

D. All of the above

Answer:

6s

Explanation:

Assume it is dropped from rest and the gravitational acceleration is 10

By the equation of motion under constant acceleration:

\(s=ut+\frac{1}{2} at^2\)

180 = (0)t+10(t^2)/2

t = 6 or -6 (rejected)

t = 6 s

The sinusoidal transverse wave has a period of 0.40 seconds, a frequency of 2.5 Hz, and a wave speed of 7.0 meters per second.

Whereas both wave types are sinusoidal, longitudinal waves oscillate parallel to the path of propagation while transverse waves oscillate perpendicular to the direction of propagation. Light and sound waves are the two types of transverse waves that are most frequently encountered.

The most natural way to depict how many things in nature change state is with a sine wave or sinusoidal wave. The amplitude of a variable can be visualized changing over time using a sine wave. Sound that can be heard might be the variable.

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Answer:

1.1ohms

Explanation:

According to ohms law E = IR

If potential difference of a battery is 2.2 V when it is connected across a resistance of 5 ohm and if suddenly the voltage Falls to 1.8V then the current in the 5ohms resistor I = V/R = 1.8/5

I = 0.36A (This will be the load current).

Before we can calculate the value of the internal resistance, we need to know the voltage drop across the internal resistance.

Voltage drop = 2.2V - 1.8V = 0.4V

Then we calculate the internal resistance using ohms law.

According to the law, V = Ir

V= voltage drop

I is the load current

r = internal resistance

0.4 = 0.36r

r = 0.4/0.36

r = 1.1 ohms

The maximum distance of the spring is nearly 0.31 m. Option (E) is correct.

Given:

Mass of the ball, m = 0.20 kg

Acceleration due to gravity, a=  9.81 m/s²

Initial height, h = 30 cm = 0.30 m

Spring constant, k = 25 Nm

The potential energy is given by:
P = mg(h+x)

P = 0.20 kg × 9.81 × (0.30 + x)

The potential energy of the spring is:

P₁= 0.5 ×  k ×  x²

P₁ = 0.5 × 25 × x²

The potential energies of the spring and ball are equal. Equating the energies:

0.20 kg × 9.81 × (0.30 + x) = 0.5 × 25 × x²

12.5x² - 1.962x - 0.5886 = 0

x = 0.31 and -0.1522

The value of x cannot be negative.

Hence, the maximum compression of the spring is nearly 0.31 m. Option (E) is correct.

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The  agents of physical weathering that might occur in a mountainous region are: Water and  changes in temperature.

Particularly in their settings with little soil and limited plant life, like mountainous areas and harsh deserts, physical weathering is one that do occurs.

Therefore, some Agents of weathering include water, ice, acids, salts, plants, animals, and variations in temperature. After a rock has been fractured, the fragments of rock and mineral are carried away by a process known as erosion. The forces of weathering and erosion cannot be withstood by any rock on Earth.

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Answer:

250N same direction

Explanation:

100+150 = 250N

same direction

Answer:

The value is  \(\rho_s = 4.026 *10^{-6} \ C/m^2\)

Explanation:

From the question we are told that

   The radius of the inner conductor  is  \(r_1 = 1 \ mm = 0.001 \ m\)

    The radius of the outer conductor is  \(r_2 = 3 \ mm = 0.003 \ m\)

    The potential at the outer conductor is  \(V = 1.5 kV = 1.5 *10^{3} \ V\)

Generally the capacitance per length of the capacitor like set up of the two conductors is

      \(C= \frac{2 * \pi * \epsilon_o }{ ln [\frac{r_2}{r_1} ]}\)

Here \(\epsilon_o\) is the permitivity of free space with value  \(\epsilon_o = 8.85*10^{-12} C/(V \cdot m)\)

=>   \(C= \frac{2 * 3.142 * 8.85*10^{-12} }{ ln [\frac{0.003}{0.001} ]}\)

=>   \(C= 50.6 *10^{-12} \ F/m\)

Generally given that the potential  of the outer conductor with respect to the inner conductor is positive it then mean that the outer conductor is positively charge

Generally the line  charge density of the outer  conductor is mathematically represented as

      \(\rho_l = C * V\)

=>   \(\rho_d = 50.6*10^{-12} * 1.5*10^{3}\)

=>   \(\rho_d = 7.59*10^{-8} \ C/m\)

Generally the surface charge density is mathematically represented as

        \(\rho_s = \frac{\rho_l }{2 \pi * r_2 }\)    here \(2 \pi r = (circumference \ of \ outer \ conductor )\)

=>    \(\rho_s = \frac{7.59 *10^{-8} }{2* 3.142 * 0.003 }\)

=>    \(\rho_s = 4.026 *10^{-6} \ C/m^2\)

The change in the total energy of the machine is zero (0).

The given parameters:

work done by the machine, W = 50 J

mass of the object, m = 10 kg

To find:

The change in the total energy of an object is the difference between the objects initial energy due to its position and the work done on the object.

Based on work energy-theory, the work done on the machine is equal to the energy of the machine.

Thus, the change in the total energy of the machine is zero (0).

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Answer:

833.9kg that's the answer

Answer:

B

Explanation:

The kinetic energy in an object is converted into potential energy. This makes the kinetic decrease, while the potential increases.

Okay, let's convert all the lengths to the same unit to compare:

(a) 100 m = 100 meters

(b) 104 μm = 104 micrometers = 104 × 10^-6 meters = 0.000104 meters

(c) 107 nm = 107 nanometers = 107 × 10^-9 meters = 0.000000000997 meters

(d) 102 mm = 102 millimeters = 102 × 10^-3 meters = 0.0102 meters

The longest length is:

(a) 100 m = 100 meters

The answer is option (a).

Answer: 100 m

Explanation:

1 μm = \(10^{-6}\) m = 0,000001 m

1 nm = \(10^{-9}\) m = 0,000000001 m

1 mm = \(10^{-3}\) m = 0,001 m

∴ 100 m es la mayor longitud

Explanation

Step 1

Diagram:

Step 2

the work done by an object is defined as:

the product of the displacement of an object and the component of the applied force which is in the direction of the object's displacement:

so,let

therefore,l to reduce the amount of force needed , we need to affect the distnace or the angle

Step 3

let's check every option

A)Make the ramp higher.

as the distnace becomes greater the force must increase too, so this is not the rigth option,in other words , a higher distnace will neeed a stronger force

B)making the ramp longer will make the angle becomes smaller, and this makes the distance becomes greater,

C) when yuo make the ramp shorter ,you will need the same force because the displacementis vertical

when the angle becomes smaller, the work will be the same, but the distnace and force, change, cos

when the angle goes to 0° degrees the required force becomes smaller, so

the answer is

b. Make the ramp longer.

D)finally, if yuo lift the object witouth the ramp ( vertically) , the distnace becomes smaller, ( only 3 m),but the force is the total weigth of the object ( 300 N)

I hope this helps you

Answer:25N/

Explanation:

Answer:

9sqrt4

Explanation:

Assuming you mean 6.0i m/s and (-2.0i + 4.0j) m/s^2:

The maximum positive x coordinate is when the time is 3 seconds, because the horizontal velocity will be zero, and therefore will be a turning point, where after that point the x coordinate will only be more negative.

After 3 seconds the x coordinate is 6*3+1/2*-2*3^2=9, and the y coordinate will be 1/2*4*3^2=18.

The distance from the origin is sqrt(9^2+18^2) = 9*sqrt(1+4)

At the instant the particle achieves its maximum positive x coordinate, the displacement is 4.03 m.

The displacement of the particle is calculated as follows;

v² = u² + 2as

where;

a = √(2² + 4²) = 4.47 m/s²

0 = u² + 2as

s = -u²/2a

s = -(6²)/(2 x 4.47)

s = -4.03 m

Thus, at the instant the particle achieves its maximum positive x coordinate, the displacement is 4.03 m.

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The  example that represents a class 2 lever is: D. a screwdriver opening a paint can.

The load is situated in a class 2 lever halfway between the fulcrum and the effort. The screwdriver's resting place against the paint can's rim serves as the fulcrum in this scenario.

The paint can's lid serves as the load, and the force exerted by the hand on the screwdriver's handle serves as the effort. A class 2 lever can be identified by the load being situated between the fulcrum and the effort.

Tweezers, salad tongs, and opening and closing a car door are not examples of class 2 levers. Class 1 levers include things like tweezers and salad tongs, whereas class 3 levers include things like car doors that open and close.

Therefore the correct option is D.

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