True or false? A well-oiled machine has no friction. Explain your answer.

True now in fact this planet has a mass of at least 0.37 jupiter masses. is this planet a likely candidate to have life like that on earth

Due to its greater mass, the planet would be subject to a stronger gravitational pull. The gravitational pull depends on two things:

Weight of the body

Distance

The planet's mass is 118 times more than Earth's, therefore the life forms there would be very different from those on Earth.

The supplied response is accurate since the planet's is far greater than the earth's, and it also relies on the planet's distance from its star in the solar system and the quantity of heat that it receives. Europa would be submerged in water as a result of the ice being warm enough to melt.

Oort cloud perturbations are not considered to be extinction events.

Supernovas are extinction-level events.

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The required electric field is  9.58 × 10⁻² N/C

We know that the electric field, E is a product of resistivity and current density

∴ E=jρ ......(i)

Where ρ⇒ Resistivity

j ⇒ Current density

j = I/A

Now, as per the question,

Resistivity of copper, ρ = 1.68  × 10⁻⁸  Ωm

Current, I = 30 ampere

Diameter = 0.259 cm = 0.00259 m

So, Radius, r = Diameter/2

                = 1.295 × 10 ⁻⁴m

Now, Cross-sectional area, A = πr²

                                                 = 3.14 × (0.001295)²

                                                 = 5.26 × 10⁻⁶ m²

Putting the values in equation (i), we get:

[tex]E = 1.68 \times 10^{-8} \times\frac{30}{5.26 \times 10^{-6} }[/tex]

[tex]E= 9.58 \times 10^{-2} N/C[/tex]

Therefore, the required electric field is 9.58 × 10⁻² N/C

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The efficiency of the motor is 92.6%

The input energy comes from the motor.

W_in = P . t

Where:

P = V. i

  = 9 volt. 3 A = 27 Watt

Hence,

W = 27 watt . 10 seconds = 270 Joules.

The output work is the potential energy.

W_out = F . s

           = 50 . 5 = 250 Joule.

The efficiency is calculated as:

Efficiency = W_out / W_in x 100%

                = 250/270 x 100% = 92.6%

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Answer:

A collision is an interaction between two objects that have made contact (usually) with each other. As in any interaction, a collision results in a force being applied to the two colliding objects. Newton's laws of motion govern such collisions

An interaction between two items that have made contact with one another  is referred to as a collision. A collision exerts a force on the objects interacting, just like any other interaction. Such collisions are regulated by Newton's laws of motion.

In physics, a collision, which is also known as an impact, is the abrupt, violent coming together and in near vicinity of two bodies, such as two pool cues, a golf club and a ball, a hammer as well as a nail, two railroad cars when linked, or a falling item and a floor.

The force and the amount of time the objects are in touch, in addition to the materials the two objects are made of, have an impact on the outcome of the impact. Generally,is common knowledge that a hardened steel ball bounced on a steel plate would rebound almost to the original position from where it was dropped, while a ball made of putty and lead will not.

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Answer:i) Energy lost by the water to cool to a temperature of 0°C from 20°C is 16800 J ii) Average rate at which the water is losing energy = 28J/s when specific heat capacity of water = 4200 J/kg K

Explanation: i)The formula used to calculate the energy lost by the water is

Q=mcΔT   where Q= heat or energy lost (or gained), m= mass of the water, c= specific heat capacity of the water, ΔT= [tex]T_{f}-T_{i}[/tex] where [tex]T_{f}[/tex] is the final temperature of the water and [tex]T_{i}[/tex] is the initial temperature of the water

Given, m=0.2kg , c= 4200 J/kg K , [tex]T_{f}=0[/tex]°C and [tex]T_{i}=20[/tex]°C

∴ΔT=[tex]T_{f}-T_{i}=(0-20)[/tex]°C= -20 K                        ∵Change of temperature in celsius = change of temperature in kelvin

∴[tex]Q=[/tex][tex]0.2*4200*(-20)= -16800 J[/tex]                    (minus denotes energy loss)

ANS:Energy lost by the water as it cools is Q=16800 joules = 16800J

ii) formula used to calculate average rate at which the water is losing energy is

average rate of losing energy [tex]=\frac{Energy Lost}{Time}[/tex][tex]= \frac{Q}{t}[/tex]

Energy Lost= Q = 16800 J                                   (from answer (i))

Time taken for water to cool to 0°C = t= 10 min= 10*60 sec= 600 sec

∴Avg. rate of losing energy[tex]=\frac{Q}{t}=\frac{16800}{600}=28 J/s[/tex]

ANS: Average rate at which the water is losing energy is 28J/s

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The downtown is 5 miles far away, if the car travels at 10 miles / hour for 0.5 hours.

v = d / t

v = Velocity

d = Distance

t = Time

v = 10 mi / hr

t = 0.5 hr

d = v * t

d = 10 * 0.5

d = 5 mi

Velocity of the car is the rate of change of position of the car. In simple words it can be said as velocity is used to calculate the distance covered in a given amount of time.

Therefore, the downtown is 5 miles far.

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By applying net force formula, the acceleration of the box is 1.8 m/s²

Acceleration is the velocity change per time taken. It is a vector quantity and it is measured in m/s²

Given that Marco pulls the box away from his brother, applying a force of 38 N to the left. His sister helps him by applying an additional force of 36 N to the left. Their brother applies a force of 35 N to pull the box in the opposite direction. The box weighs 22 kg.

F = ma

Where

To determine the acceleration of the box, substitute all the parameters into the formula

(38 + 36) - 35 = 22 a

74 - 35 = 22a

39 = 22a

a = 39/22

a = 1.77 m/s²

Therefore, the acceleration of the box is 1.8 m/s² approximately.

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If the temperature of the gas is decreased then the pressure will also decrease.

The molecules of a gas receive more energy when heated, causing them to move more quickly. This results in increased pressure and more impacts on the container's walls. On the other hand, cooling the molecules will cause them to slow down and reduce pressure.

This is more explained by Gay Lussac's Law which states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature.

                                      P1/T1 = P2/T2

Thus, with decrease in temperature the pressure will decrease as the move of molecules will be slow now.

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Answer:

Since 60 mph = 88 ft/sec

10 mph = 14.7 ft/sec

70 mph = 7/6 * 88 ft/sec = 103.7 ft/sec

a = (v2 - v1) / t = (103.7 - 14.7) ft/sec / 7200 sec = .0124 ft/sec^2

Answer:

Momentum can be well defined as the measure of the kinetic energy of the object. In simple words, the momentum is the product of mass and velocity.

Answer: 40 km/hr ( c )

Explanation:

Distance =20 km

Time =30 min=

60

30

​

hr=

2

1

​

hr

∴ Speed =

time

Distance

​

=

(

2

1

​

hr)

20 km

​

⇒ Speed =40 km/hr

Option (C) is correct.

Answer:

Explanation: because it develops a thin oxide layer on the surface when the metal comes in contact with oxygen. The oxide layer protect the aluminum against corrosion and if damaged it will immediately regenerate in presence of

The resultant speed of the person on the cruise ship is 12.62 m/s.

The resultant speed of an object is the single speed which can effectively represent two or more speed of the object.

The magnitude of the resultant speed of the person on a cruise ship is calculated as follows;

Vr² = Va² + Vb²

where;

Substitute the value of the north speed and east speed to determine the resultant speed of the person on the ship.

Vr  =  √Va² + Vb²

Vr = √[(3.9 m/s)² + (12 m/s)² ]

Vr = 12.62 m/s

Thus, for a person on a cruise ship is doing laps on the promenade deck at a speed of 3.9 m/s to the north and the speed of the ship 12 m/s to the east, the resultant speed is 12.62 m/s.

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The complete question is below:

Find the resultant speed of the person

Both solenoids and electromagnets produce magnetic fields using electric current and coiled wires. The correct option is A

An electromagnet can be defined as a type of magnet in which the magnetic field is produced by an electric current.

Electromagnets usually consist of wire wound into a coil.

Both solenoids and electromagnets produce magnetic fields using electric current and coiled wires.

The simple arrangement and construction of electromagnets requires an insulated copper wire, iron rod and battery.

Electromagnets has some advantages which includes :

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an angled v-tube Theta theta is open to the atmosphere at point a and contains some viscous liquid outside. The v-tube is HH in height. The speed at which the v-tube rotates along axis ab is variable. Assume that PP0 is the atmospheric pressure.

Atmosphere

An atmosphere is a subcaste of gas or layers of feasts that wrap an earth and are held in place by the gravity of the planetary body (from Ancient Greek: "atmós" "vapour," "brume," and "sphaîra" "sphere"). When the graveness is strong and the temperature of the atmosphere is low, the earth keeps its atmosphere. The outer portion of a star, known as its astral atmosphere, is made up of the layers above the opaque photosphere; low-temperature stars may have astral atmospheres that contain emulsion motes.

Nitrogen (78), oxygen (21), argon (0.9), carbon dioxide (0.04), and trace gases make up the Earth's atmosphere.

Most species utilize oxygen for respiration, while shops, algae, and cyanobacteria use carbon dioxide for photosynthesis. Lightning and bacteria use nitrogen obsession to manufacture ammonia, which is used to synthesize nucleotides and amino acids. The atmosphere's stratified structure reduces the dangers of the sun, UV radiation, solar wind, and cosmic shafts to protect species from irreparable harm. The biochemical modification of the pale atmosphere by living beings billions of times has led to the makeup of the Earth's atmosphere as it is now.

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Answer:

Acceleration 0.238 m/s²

Explanation:

Given:

V₀ = 13.2 m/s

V = 15.1 m/s

t = 8.00 s

__________

a - ?

Is the acceleration of the object:

a = (V - V₀) / t

a = (15.1 - 13.2) / 8.00 ≈ 0.238 m/s²

Acceleration of the object is 0.238 m/s²

Acceleration of an object is rate of change of velocity with respect to time. Due to having both direction and magnitude, it is a vector quantity of SI unit meter/second².

Given parameters:

Initial velocity; V₀ = 13.2 m/s

Final velocity; V = 15.1 m/s

time; t = 8.00 s

acceleration of the object; a = ?

We know, for accelerated object;

acceleration; a = (V - V₀) / t

⇒a = (15.1 - 13.2) / 8.00 ≈ 0.238 m/s²

Hence, acceleration of the object is 0.238 m/s².

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Since Two pulses are moving along a string, Mu response is Yes, there be an instance in which the wave interference is at the same level as point X because there will be an overlap  in the way of the slope of the waves.

When two pulses collide to produce a bigger pulse, this is called constructive interference. The two beginning pulses' amplitudes are added to create the size of the final pulse.

Note also that if two waves collide while moving across the same medium, wave interference is the result. The medium assumes a shape as a result of the net impact of the two distinct waves on the medium's particles due to wave interference.

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See full question below

Two pulses are moving along a string. One pulse is moving to the right and the second is moving to the left. Both pulses reach point X at the same instant.Will there be an instance in which the wave interference is at the same level as point X?

The average speed in miles per hour is 65 mph.

Total distance d = 2275 miles

Total time t = 45 hours

To calculate average velocity

v = d/t

where v is velocity, d is distance and t is time.

v = 2275/45

v = 65 mph.

Thus, the average speed in miles per hour is 65 mph.

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Radial acceleration is inversely related to the radius of the curved pathway and directly proportional to the square of the linear speed. The ratio of the square of the angular speed to the radius of the curved pathway is directly proportional to the radial acceleration.

This is the acceleration of an object moving at speed v within a circle of radius r. Therefore, as you may have experienced while driving a car, centripetal acceleration is greater at high speeds and in acute curves (smaller radii). y.

We can argue that as the radius increases, the centripetal acceleration of the item moving in a circle falls exponentially. Along the radius, the centripetal acceleration's magnitude diminishes.

The centripetal acceleration would be decreased if the radius were decreased while all other factors remained constant, but it would be increased if the speed were increased while all other factors remained constant.

The radius of the circular path is 10m and the acceleration is 1.5g the speed of the rider is 1.82 m/s/s.

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The static coefficient of friction between m1 and m2 and m2 and the wall (designated as s1 and s2, respectively) if the minimum force F minimum necessary to prevent the blocks from separating and sliding under the action of gravity is F minimum.

What is static friction coefficient?

The ratio of limiting friction to the usual reaction between the surfaces is known as the coefficient of static friction.

This equation yields the minimum coefficient of static friction:

When the radius of curvature R = 190 m and the vehicle's speed V is 72 km/h (20 m/s), the smallest value of the coefficient of static friction Typically, it is represented by the Greek letter mu ().

In terms of math, is equal to F/N, where F stands for frictional force and N for normal force. The coefficient of friction has no dimensions because both F and N are measured in units of force (such as newtons or pounds). friction equals 0.21.

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Answer: Purple because it is greater than the red in mass and the more mass and the more mass it is the stronger it would be to have a change in velocity.

Explanation:

Answer:

Crash 2

Explanation:

The force on purple paddle was stronger, so the force on the puck has to be stronger

The function should be matched to the correct part of the neuron as follows:

A neuron can be defined as a nerve cell that's saddled with the responsibility of transmitting electrical signal (impulses) down an axon across a cellular membrane of the body of a living organism through an action potential.

In Science, the neuron comprises different parts and these include the following:

In conclusion, we can reasonably infer and logically deduce that a neuron transmits electrical signal (impulses) down an axon (a long, tail-like structure) across a cellular membrane of the body of a living organism to another neuron, usually through a process referred to as an action potential.

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The work done by friction W = (F1 - mg sin θ) L,   W = -μ  mg cos θ L.

Use Newton's Second Law to find the force of friction. In these tasks, the X-axis will be parallel to the plane and the Y-axis will be perpendicular to the plane:

Y-Axis  

N -  =[tex]w_{y}[/tex]

N = W_{y}

X axis

F1 - fr - Wₓ = 0

fr = F1 - Wₓ

Let's use trigonometry to find the components of the weight

sin θ = Wₓ / W

cos θ = W_{y} / W

Wₓ = W sin θ

W_{y} = W cos θ

We substitute

fr = F1 - W sin θ

Work is defined by

W = F .dx

W = F dx cos θ

Since the friction force is in the negative direction parallel to the plane and the displacement along the plane is positive, the angle is 180° and cos θ = -1

W = -fr x

W = (F1 - mg sin θ) L

Another way to calculate is

fr = μ N

fr = μ W cos θ

the work is

W = -μ  mg cos θ L.

Zero work can occur in any of the following situations When a single force is applied but no displacement. There are gaps but the power of the individual is not showing. A single force is applied in a direction perpendicular to the direction of displacement.

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The kelly - bessemer process used for converting the iron metal to molten steel by injecting air into molten pig iron.

Molten steel (from an oxygen or electric arc furnace) is poured into a ladle that is brought to the inlet of a continuous casting machine, raised onto a turret, and poured into a tundish. This is a large vessel that ensures the continuous flow of hot metal through a submerged entry nozzle and into a water-cooled and vertical copper mould, where the solidification starts as an outer shell starts encasing a liquid core.         Hydrogen is highly soluble in molten steel, including weld metal.

    The partial pressure or concentration of hydrogen above the molten steel determines the equilibrium solubility. It is a really difficult process.

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Answer:

58.01

Explanation:

because this is he answer to the question 019.10

Coal is burned to create steam, which is then used to generate electricity at coal-fired power stations. Under extreme pressure, the steam generated enters a turbine, which turns a generator to provide power. In order to restart the process, the steam is then cooled, condensed back into water, and fed back into the boiler.

For example, the Kingston Fossil Plant near Knoxville, Tennessee, uses coal to heat its boilers to around 1,000 degrees Fahrenheit in order to produce high-pressure steam as a practical illustration of this.

How is energy generated by burning coal?

Whether bituminous, subbituminous, or lignite, they are all burned in coal-fired power plants. The heat generated by coal combustion is utilized to turn water into high-pressure steam, which drives a turbine and generates electricity.

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The magnitude of the constant frictional force that acts on the car is 574.6

The frictional force is the force that acts to oppose the relative motion of an object over another.

Friction is a contact force that acts at the surface of contact between two bodies.

The frictional force acting on an object depends on the following:

The total force exerted by the friends = 800 N

Force on the car as it moves will be = mass * acceleration

acceleration, a = v² - u² / 2 * s

a = 1.40² - 0² / 2 * 5

a = 0.196 m/s²

force = 1.15×10³ kg * 0.196 m/s²

force = 225.4 N

Frictional force = 800 - 225.4

Frictional force = 574.6 N

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Complete question:

A car of mass 1.15×10^3kg is stalled on a horizontal road. You and your friends give the car a constant, forward, horizontal push. There is friction between the car and the road.

the combined force that you and your friends exert has magnitude 8.00×102n , and starting from rest the car reaches a speed of 1.40 m/s after you have pushed it 5.00 m . find the magnitude of the constant friction force that acts on the car.