19, 20, and 21 are confusing

Given

The focal length , f=3.93 cm

The object distance, u=-19.24cm

To find

The image distance

Explanation

By lens formula we have,

Conclusion

The image distance is 0.0495 m

We have the formula of Newton's second law

Where F is the force, m is the mass and a is the acceleration.

If we isolate the acceleration

As we can see if the mass increases the acceleration will decrease

Therefore the answer is FALSE

Answer:

Given,

Force = 441 N

mass = ?

Keep in mind that acceleration due to gravity is constant 10m/s.

Force = mass × acceleration due to gravity

mass = Force / acceleration due to gravity

m = 411 N /10m/s

m = 41.1 kg

Therefore her Jenny mass is 41.1 kg.

The work done by friction is -1617 J

Work done is the product of force and distance moved in the direction of the force.

Friction is the opposition to motion between two surfaces

From the lwa of conservation of energy, the work done by friction, W equals the change in potential energy of the skater, ΔU.

So, ΔU = W

mgΔh = W

mg(h₂ - h₁) = W where

So, substituting the values of the variables into the equation for the work done, we have

W = mg(h₂ - h₁)

= 55 kg × 9.8 m/s²(12 m - 15 m)

= 55 kg × 9.8 m/s² × (-3 m)

= 539 kgm/s² × (-3 m)

= -1617 J

So, the work done is -1617 J

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The temperature increase of the 2 kg water if 400 kJ of energy is transferred is 47.62 °C

q = m c ΔT

q = Heat

m = Mass

c = Specific heat

ΔT = Change in temperature

q = 400 KJ

m = 2 kg

c = 4200 J/kg °C

ΔT = q / m c

ΔT = 400 * 10³ / 2 * 4200

ΔT = 47.62 °C

The quantity of heat energy required to change the temperature of particle by 1 °C is known as heat capacity. Specific heat capacity is the heat capacity is calculated for 1 gram of matter.

Therefore, the temperature increase of water is 47.62 °C

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ANSWER

Figure 1

EXPLANATION

We want to identify the correct force diagram acting on the object on the inclined plane.

When an object is moving on an inclined plane, there are four forces acting on it:

1. Friction force, Fr

2. Normal force, FN

3. Component of weight acting parallel to the inclined plane = Wsinθ

4. Component of weight acting perpendicular to the inclined plane = Wcosθ

Therefore, the correct option is Figure 1.

Acceleration = Change in Velocity / Time Interval

So,

A=15/10

A=1.5m/s.

Acceleration is defined as the rate of change of velocity over time. Acceleration is a vector quantity because it has both magnitude and direction. It is also the second derivative of position with respect to time or the first derivative of velocity with respect to time. Acceleration is the name we give to the process of changing velocity. Because speed is speed and direction.

There are only two ways to accelerate. Either change speed change direction or change both. Acceleration is the rate of change of velocity. At any point in the orbit, the magnitude of the acceleration is given by the rate of change of magnitude and direction of velocity at that point. Velocity is the primary measure of object position and velocity. It can be defined as the distance traveled by an object in a unit of time.

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The speed of the mass at the moment before impact is 3.28 m/s.

What is the final speed of the egg?

The speed of the mass at the moment before impact is calculated from the principle of conservation of energy as shown below.

K.E(bottom) = P.E(top)

¹/₂mv² = mgh

v² = 2gh

v = √2gh

where;

Substitute the given parameters and solve for the speed of the egg before the impact.

v =  √2gh

v =  √(2 x 9.8 x 0.55)

v = 3.28 m/s

Thus, the speed of the mass at the moment before impact is determined by applying the principle of conservation of energy.

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Given:

Coal-fired power plant

Required:

Energy transformation in coal-fired power plant.

Explanation:

Coal has chemical energy.

When the coal is heated, the chemical energy transforms into thermal energy.

Thermal energy is used to rotate the blade of the turbine, so thermal energy transforms into mechanical energy.

The rotating blades produce electricity, so mechanical energy transforms into electrical energy.

Final Answer: The energy transformation of a coal-fired power plant is chemical to thermal to mechanical to electrical.

Misrepresentations of physical stimuli are known as Absolute Threshold

What is stimulus?
A stimulus is a measurable change in the physical or chemical structure of an organism's internal or external environment in physiology. Sensitivity refers to an organism's or organ's ability to perceive external stimuli and respond appropriately (excitability). Sensory receptors can receive information from both inside and outside the body, such as touch receptors in the skin or light receptors in the eye, as well as chemoreceptors and mechanoreceptors. When a sensory receptor detects a stimulus, it can generate a reflex via stimulus transduction. A homeostatic control system's first component is frequently an internal stimulus. External stimuli, such as the fight-or-flight response, are capable of eliciting systemic responses throughout the body.

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Resistance 100

Current 4.2A

Based on the information of the last point, we know the current and now we have the resistance. With these two numbers we can calculate the drop of voltage generated by the resistance.

Is important to highlight that we asume the same current for each line because the current is constant in all the parallel lines.

Answer: the resulting velocity of the two cars right after the collision is 9.41 m/s

Explanation:

The formula for calculating momentum is expressed as

momentum = mass x velocity

According to the law of conservation of momentum, initial momentum = final momentum

The formula for initial momentum is

m1u1 + m2u2

where

m1 = mass of first car

u1 = initial velocity of first car

m2 = mass of second car

u2 = initial velocity of second car

From the information given,

m1 = 1101

u1 = 18.39

m2 = 1050

u2 = 0 because it is at rest

Initial momentum = 1101 x 18.39 + 1050 x 0 = 20247.39

Since the cars stick together after collision, they would have a common velocity, V. Thus,

final momentum = (m1 + m2)V

final momentum = (1101 + 1050)V = 2151 V

Thus,

20247.39 = 2151 V

V = 20247.39/2151

V = 9.41

the resulting velocity of the two cars right after the collision is 9.41 m/s

Buildings can be destroyed by earthquakes or knocked down, trapping people underneath.

Only regions close to the water are susceptible to tsunamis, but anybody may be affected anywhere by earthquakes. Buildings can be destroyed by earthquakes or knocked down, trapping people underneath. Uneven surfaces and damaged roadways can result from the shifting and cracking of the Earth during earthquakes. When two chunks of the ground abruptly slide past one another, an earthquake results. The fault or fault plane is the area where they slide. Sudden movement along Earth's fault lines causes earthquakes. The motion releases "elastic strain" energy that has been accumulated in the form of seismic waves, which travel through the Earth and cause the earth to tremble.

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Answer:

there are 6 circles and 2 triangles. what is the simplelest ratio of triangles to circles

When lifting an object we are required to produce a force that is greater or equal than the weight of the object in order to be lifted:

When we use a ramp we have the following distribution of forces:

In the ramp, the force decomposes into two components. A component that is parallel to the ramp and a component that is perpendicular to the ramp. Now the force must be greater or equal to the parallel component of the ramp therefore, the amount of force required must be less. Therefore, the ramp makes it easier by decreasing the amount of force required to move the object.

Objects, especially simple machines, make work easier. They do not decrease the amount of work done, but actually decrease the amount of force applied. The less force applied, the easier it is to do work. Simple machines and other objects that help make work easier decrease the amount of force required to move an object.

So the answer is-

A ramp makes work easier by decreasing the amount of force required to move an object

D. As the Sun was forming, the force of gravity caused surrounding dust grains to collide and stick together, forming dust granules into increasingly larger bodies that became planets.

About 4.6 billion years ago, the Solar System was a cloud of dust and gas known as the Solar Nebula.  

Gravity is the force that pulls a body toward the center of the Earth or any other physical body that has mass.

Therefore "As the Sun was forming, the force of gravity caused surrounding dust grains to collide and stick together, forming dust granules into increasingly larger bodies that became planets", best describes scientists explain gravity's role in the formation of our Solar System.

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In order to calculate the resistance of this wire, we can use the formula below:

Where p is the resistivity, d is the length and A is the cross-sectional area of the wire.

The resistivity of the copper is 1.72 * 10^-8 ohms*m, so we have:

Given

When light is reflected, the incident rays are bent and change direction

To find

Whether the given statement is true

Explanation

When we flash a light on the mirror, the light changes its direction and move in another way. So the incident light changes direction when reflected

Conclusion

The given statement is TRUE

The steady force required of each rocket is 27,875 N.

The steady force required by each rocket along the circular path is calculated as follows;

F = ma

where;

The centripetal acceleration of each rocket is calculated as follows;

a = ω²r

where;

ω = 46 rpm = 46 rev/min x 2π rad/rev x 1 min/60s = 4.82 rad/s

t = 7 min = 7 x 60 s = 420 s

a = ω²r

a = (4.82²) x 4.8 m

a = 111.5 m/s²

The steady force is calculated as follows;

F = ma

F = 250 x 111.5

F = 27,875 N

Thus, the steady force required of each rocket is determined by applying the concept of centripetal force.

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The cannon ball will travel the highest distance when the angle of projection is 35 degrees.

The maximum height reached by a projectile is calculated using the following formula.

H = u²sin²θ/2g

where;

when the angle of projection is 25 degrees;

H = (25² (sin 25)²) / (2 x 9.8)

H = 5.7 m

when the angle of projection is 35 degrees;

H =  (25² (sin 35)²) / (2 x 9.8)

H = 10.5 m

Thus, the cannon ball will travel the highest distance when the angle of projection is 35 degrees.

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The velocityof the flowerpot when it strikes the ground is 26.04.

What is velocity.

velocity is the prime indicator of the position as  well as the rapidity of an  object. It can be  defined as distances covered by an object in unit of the time. velocity can  defined as the displacement of the object in unit of the time .

Sol- As we know when the object is simply falls it's initial velocity is 0.

Therefore u=0

Given question is flowerpot traveled 34.6 before striking the ground.

Therefore s=34.6

We have to find v?

v^2= u^2+2gs

v^2= 0+2gs

v=√2gs

v=√2×9.81×34.6

v=26.04

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The lowest height at which speaker B can be placed above speaker A to produce the lowest sound to the person standing in front of A by superposition and wave interference is ∆y ≈ 2.41 m.

The superposition principle states that the magnitude of the resulting wave when two waves overlap is the sum of the disturbance of the individual waves.

The given parameters are;

Height of speaker B above speaker A = ∆y

Wavelength of the wave = 0.880 meters

Distance between the person standing directly in front of speaker A and speaker A, ∆x = 6.38 meters

Required;

The minimum height of speaker B above speaker A that produces the minimum sound to the person in front of speaker A

Solution;

The minimum sound is given when there is destructive interference of the waves produced by the speakers

When there is destructive interference, the peak of the wave from speaker A coincides with the through of the wave from speaker B which gives;

Distance between a peak and the through of a wave = 0.5 × The wavelength

Therefore, for minimum sound, we have;

Distance from the person to speaker B = 6.38 m + 0.5 × (The wavelength)

Which gives;

Distance from the person to speaker B = 6.38 m + 0.5 × 0.88 m = 6.82 m

Pythagorean theorem is used to find the height of speaker B above speaker A as; ∆y = √(6.82² - 6.38²) ≈ 2.41

The height of speaker B above A is approximately 2.41 meters

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The lowest height that Speaker B can be placed above Speaker A to produce a minimum of sound heard by a person standing Δx=6.38 meters directly in front of Speaker A is

[tex]\Delta y=1.62m[/tex]

This is further explained below.

Generally, For a person, to hear sound minimum, sound waves from speakers A and B should meet at point P, in opposite phases, so path diff. should be

[tex]x=(2 n+1) \frac{\lambda}{2},[/tex]

[tex]\lambda[/tex]= wavelength

[tex]for $\Delta y$ to be minimum $\Rightarrow x=\frac{\lambda}{2}$ \\\\from figure, in $\triangle A B P$$$\Delta x^2+\Delta y^2=\Delta x^{\prime 2}=\text { (2) }$$[/tex]

Path diff. will be x=B P-A P

[tex]\begin{aligned}& \quad x=\Delta x^{\prime}-\Delta x \\\\&\Delta x^{\prime}-\Delta x=\frac{\lambda}{2} \quad x=\frac{\lambda}{2} \quad \text { from eq (1) } \\\\&\left.\Delta x^2+\Delta y^2-3.01=0.41 \quad \quad \quad \quad \lambda=0.820 \mathrm{~m}\right] \\\\&\Delta x^2+\Delta y^2=3.42 \\\\&\Delta y^2=(3.42)^2-(3.01)^2 \quad \Delta x=3.01 \mathrm{~m} \\\\&\Delta y=1.62 \mathrm{~m}\end{aligned}[/tex]

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Rain falling from a cloud is not an example of energy transfer.

After thoroughly calculating we have come to find that, the tension in the string is 2.752 N

In physics, tension is defined as the pulling force transmitted axially by a string, cable, chain, or other similar object, or by each end of a rod, truss member, or other similar three-dimensional object.

Tension can also be defined as the action-reaction pair of forces acting at each end of the aforementioned elements. Compression's opposite, tension, is possible.

We know that

Tension = (Mass × gravity) / cos∅

Here given that

Mass = 0.280kg

Gravity = 9.8 m/s²

∅ = 4.2°  

Lets substitute the values and we get

Tension = (280g × 9.8 m/s²) / cos4.2°  

Tension = 2.752 N

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Full question

A tetherball leans against the smooth, frictionless

post to which it is attached (Figure 1). The string is

attached to the surface of the ball such that a line

along the string passes through the center of the

ball. The string is 1.40 m long, and the ball has a

radius of 0.110 m with mass 0.280 kg. What is the

tension in the string?

The charge of a proton is 2.3 X 10^-22 N. Option C.

The force between two protons is the electrostatic repulsion. The electrostatic force is the force that develops between electric charges. This is called the strong nuclear force. It is one of the basic strengths. The amount of strong nuclear force acting between two protons is the same as the amount of strong nuclear force acting between two neutrons.

The nuclear force is the force acting between the protons and neutrons of an atom. The nuclear force is the force that binds protons and neutrons within the nucleus. This force can exist between protons and protons neutrons and protons or neutrons and neutrons. This force holds the core together. nuclear power. Nuclear forces act between all particles in the nucleus between two neutrons between two protons and between neutrons and protons.

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The velocity and acceleration of the marble will be greater when it travels 1.5 m compared to 0.5 m.

The velocity of an object is the rate of change of displacement with time.

The velocity of the marble after it has travelled the given distance is calculated as follows;

v² = u² + 2as

where;

Assuming the marble started from rest, without initial velocity, our final equation becomes.

v² = 0² + 2as

v² = 2as

v = √2as

From the final equation, the velocity of the marble increases with increase in the distance travelled by the marble.

Also, since acceleration is defined as the rate of change of velocity with time. As the velocity increases, the acceleration of the marble increases as well.

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The blades on the turbines transform the energy coming from the wind into rotational kinetic energy.

The blades convert wind energy into rotational energy.

Answer:

Explanation: We need to find the unit rate or rate of rolls per $1:

To find the number of rolls per one dollar we simply need to take the ratio of the two as follows:

Simplifying (1) gives the answer as follows:

The answer therefore is: