Suppose you are on a cart, initially at rest, which rides on a frictionless horizontal track. If you throw a ball off the cart towards the left, will the cart be put into motion?.

Answer:

aowbe9 wieveiq diqbedi diwbe

Explanation:

01837192

Answer:

9m/s

Explanation:

Speed = Distance ÷ Time

Distance=270meters

Time =30 seconds

270m

30s

=9m/s

Prior to cooking, searing meats at high heat seals the pores, preserving the juices and preventing shrinking.

A roast looks and tastes good when it is roasted at high temperatures (400°F and above). For thin, tender meats that depend on a flavorful, well-browned crust for flavor, such beef tenderloin and pork tenderloin, this approach works best.

If you want to produce the most delectable roasts, steaks, chops, and other meat dishes, searing the meat is a necessary step.

Meat is seared to caramelize the natural sugars and brown the proteins, resulting in a thick, nutty crust.

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For horizontally-launched projectiles, the acceleration is constant in both directions; option B.

Projectiles are objects which are launched into space and allowed to fall freely under the effect of gravity.

The motion of projectiles is known as projectile motion.

The path of a projectile motion is a parabola.

When an object or a ball is launched into the air, it moves with a constant downward acceleration.

The direction of acceleration due to gravitational force of the earth is constant in both directions.

Therefore, since the acceleration in the x-axis is zero and acceleration in the y-axis is -s -9.8 m/², the acceleration is constant in both directions.

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The equally spaced dots shows a car if it were accelerating constantly.

The term acceleration has to do with the rate of change of the velocity of a body with time. We know that velocity is a vector quantity. This implies that both the magnitude and the direction of the velocity are all important. The same goes for acceleration. The acceleration is a vector quantity so both its magnitude and direction are deemed as important.

Now we know that if the acceleration is uniform or constant, the velocity would increase by equal amounts in equal time intervals. We now have to check out to see the cases in which the image suggests that the velocity changes by equal amounts in equal time intervals.

Looking at the image as attached, the dots are equally spaced. The equal spacing of the dots shows us the way and manner in which the velocity of the car increases. Thus the image attached shows us that the velocity does increase by equal amounts in equal time intervals.

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Answer:

The strong force binds quarks together within protons, neutrons, and other subatomic particles. Rather as the electromagnetic force is ultimately responsible for holding bulk matter together, so the strong force also keeps protons and neutrons together within atomic nuclei.

Explanation:

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The speed of 2193 mph expressed in km/h is: 3530.73 km/h

To solve this problem the we have to do the conversion of units with the given information.

Information about the problem:

By converting the velocity units from  (miles/h) to (km/h) we have:

v = 2193 miles/h * 1.61 km/1 mile

v = 3530.73 km/h

It is the transformation of a value expressed in one unit of measurement into an equivalent value expressed in another unit of measurement of the same nature.

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The correct answer is Teflon

Numerous applications can be found for polytetrafluoroethylene (PTFE), a synthetic fluoropolymer of tetrafluoroethylene. It is one of the most popular and often used PFAS. Teflon, manufactured by Chemours, a division of DuPont, which made the compound's initial discovery in 1938, is the term by which PTFE-based materials are most generally recognized. Polytetrafluoroethylene, a high-molecular-weight polymer made entirely of fluorine and carbon, is a fluorocarbon solid. PTFE is hydrophobic, meaning that neither water nor things containing water can bind to it. This is because fluorocarbons only exhibit weak London dispersion forces since fluorine has a poor electric polarizability. One of the lowest coefficients of friction of any substance is found in PTFE. For pans and other cookware, polytetrafluoroethylene is utilized as a non-stick coating.

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According to usual sign convention, thermal expansion creates a negative strain. TRUE

The propensity of matter to vary in volume in response to temperature changes is known as thermal expansion. A substance’s particles move more when it is heated, maintaining a greater average separation. Thermosets experience linear thermal expansion since they are employed in solid form.

The term “thermal expansion” refers to an object’s propensity to change its dimensions as a result of heat, including length, density, area, and volume. The substance’s kinetic energy increases when it is heated.

There are three forms of thermal expansion:

Linear growth.

Area enlargement

Volume increase

When an object’s temperature rises, it expands or grows in size, a process known as thermal expansion. Thermal expansion takes place

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With the use of motion under the gravity formula, It will take 2.45 seconds for the ball to hit the ground.

Linear motion involves the movement of a body in a straight line. It can be horizontal motion or vertical motion which is also known as motion under gravity.

Given that a ball is dropped from the top of a tall building of height h = 29.47 m. To know how long it take the ball to hit the ground if acceleration due to gravity is to be 9.81m/s² and we neglect air resistance, we will make use of the formula below

h = ut + 1/2gt²

Since the ball is dropped from the top of a tall building, u = 0

29.47 = 1/2 × 9.81 × t²

29.47 = 4.905t²

t² = 29.47 / 4.905

t² = 6.008

t = √6.008

t = 2.45 s

Therefore, it take 2.45 seconds for the ball to hit the ground.

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A measurement must have units to be meaningful.

Scientific measurements are generally based on the International System of Units. It is important to always include units when recording data, calculating, and reporting results. Units are globally recognized and necessary for the exchange of information among scientists around the world.

A conversion factor is a factor used to convert from one unit of measurement to another. Simple conversion factors can convert meters to centimeters, while more complex conversion factors can convert miles per hour to meters per second. The International System of Units commonly abbreviated as SI from the French Le Système International d'Unités is the modern metric system. SI was founded in 1960 by the 11th General Assembly of Weights and Measures.

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When Earth gets closer to a slow-moving outer planet and surpasses it in its orbit, that outer planet shows retrograde motion, similar to how a quicker runner goes past a slow runner in the outside lane.

The orbital movement of a spatial entity in the opposite direction of what is usual in a specific system is known as retrograde motion. The term "retrograde" is based on the Latin terms retro, which means "backward," and gradus, which means "step." As observed from Polaris, all main planets in the Solar System circle the Sun counterclockwise.

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With the help of the mathematical concept of Functions in physics, the number of days for population to reach 800 will be approximately 69 days.

Functions in physics is a mathematical concept used to represent different types of physical quantities in nature. Some types of functions are- linear, quadratic, cubic, exponential and reciprocal functions. A functions relates a set of inputs with another set of desired outputs. Functions are essential for formulating physical relationships in theoretical and practical sciences. For example, functions can be widely used in the representation of electric and magnetic fields in space and time, they are used in quantum mechanics, it is very widely used in determining the position and motion of an object in space. We perform a variety of mathematical operations on functions to make some conclusions and to answer some typical questions related to a physical system.

Here in this question, we have a function which represents a certain population of insect, the function is given by,

[tex]P(t)=200e^0^.^0^2^t[/tex]

where [tex]t[/tex] represents the number of days.

We have to find the total time in days for the population to reach 800 insects, that means,

[tex]P(t)=800[/tex]

Hence,

[tex]200e^0^.^0^2^t=800[/tex]

[tex]e^0^.^0^2^t=\frac{800}{400}[/tex]

[tex]e^0^.^0^2^t=4[/tex]

Taking natural log both sides

[tex]ln e^0^.^0^2^t=ln 4\\[/tex]

[tex]0.02t=ln4[/tex]

[tex]t=\frac{ln4}{0.02}[/tex]

[tex]t=69.3\\[/tex]

[tex]t=69[/tex] days (appproximately)

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Light travels at the exact speed of 299,792,458 meters (983,571,056 feet) per second in a vacuum.

The light passes through a 2.0-mm-thick section of window glass

= 1 × [tex]10^{-14}[/tex]    sec

Speed is defined as the rate at which an object's position changes in any direction. Speed is calculated as the ratio of distance traveled to time spent traveling. Speed is a scalar quantity because it has a direction but no magnitude. The SI unit of speed is milliseconds per second.

There are several types of speeds:

Speed is the street name for amphetamine sulphate, but it can also refer to other amphetamines. It's usually an off-white or pinkish powder that resembles crystals. It is also available in the form of a paste, which is usually white/grey or brown in color and can be damp and gritty.

Hence,

A thick piece of window glass = 2 mm

speed of light in medium = speed of light in vacuum / refractive index

      = (3×[tex]10^{8}[/tex])/1.5  

       = 2 ×[tex]10^{8}[/tex] m/s                                           

Time = distance / speed  

      = (2 × [tex]10^{-3}[/tex] )/(2 × [tex]10^{-11}[/tex])

      = 1 × [tex]10^{-14}[/tex]    sec

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[tex]1.17\times 10^{9 }[/tex]atoms would you need to have a necklace 36.0 cm long.

The radius of the gold atom = 145pm

The diameter of gold atom = 2[tex]\times[/tex]145pm

 = 290Pm  

[tex]=290\times10^{-10} cm[/tex]

gold atoms   = [tex]34cm/290\times10^{-10}cm[/tex]

= [tex]1.17\times 10^{9}[/tex] atoms  will be find in 36.0 cm necklace

Atomic radius is the distance from the nucleus to the edge of the atom

atomic radius decreases as we  go across the periodic table

electronegativity is ability of an atom to attract electrons when the atom is in a chemically combined compound

Atomic Radius : Group Trend: as we go down a column, atomic radius increases.

Periodic Trend: as we go across a period, (L to R), atomic radius decreases.

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Explanation:

i think the second picture is smaller and has a better angular resolution

In second photo, there has more resolution than that of first photo.

The ability of an optical equipment to discern between two things that are close to one another and produce distinct images of the two items is known as its resolving power.

To put it simply, when viewed through an optical instrument, resolving power varies inversely with the distance between the two objects to be resolved. As a result, when viewed from the device, the images of two things that are close to one another should appear distinct and separate.

Consider using a telescope to observe two stars that are close to one another; the telescope's resolving power depends on its capacity to distinguish between the pictures of the two stars.

According to the question, second telescope can detect two stars separately but first one can't because the resolving power of the second telescope is greater than that of first one. That's way, the difference between the two photos is that second photo is with greater resolution.

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Answer:

115.88 m

Explanation:

The complete distance around the field (perimeter) is equal to the whole sum of the 4 sides:

Imagine you stroll trough the border of the field, you go 38.44m to the right, 19.5m up, 38.55m to the left, 19.5m down.

No matter how far away or how large the charges are, the electric field in the middle of any two equal charges is always zero.

E is equal to Fe/q [where q is a positive test charge, Fe is the electric force vector, and E is the electric field vector].

According to the Coulomb Force, Fe = k Q q / r2,

and as a result, E = [K Q q / r2]/q

=K Q/r^2

Because similar charges repel one another, the field's orientation is away from the core charge.

The outcome is TWO FIELDS with the same magnitude but opposing directions, giving a value of ZERO.

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In free fall, the fact that in the acceleration value (10 m/s^2) the unit of the second appears twice indicates that the object is moving at a rate of 10 meters per second every second.

The acceleration is the physical quantity that indicates the variation of velocity as a function of time,  and it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

It is when the object or mobile falls from a height (h) with a positive acceleration equal to the gravity, describing a vertical rectilinear travel.

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The statement is True.

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A large iron skillet may hold more heat capacity than a small one because of its larger mass. Both skillet have the same specific heat because they are constructed of the same material.

A physical feature of matter known as heat capacity or thermal capacity is the quantity of heat that must be applied to an object in order to cause a unit change in temperature. J/K is the metric unit for heat capacity.

An extensive property is heat capacity.The heat is related to the substance's mass and the temperature change since the transferred heat is equivalent to the change in internal energy.

An object's mass and chemical makeup both affect its ability to hold heat. Therefore, a large iron skillet may hold more heat capacity than a small one because of its larger mass. Both skillet have the same specific heat because they are constructed of the same material.

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A heat engine operates in a Carnot cycle between reservoirs of temperatures 1000 k and 400 k. it is found to discharge 20 j of heat per cycle to the cold reservoir, then the work done by the engine would be 60 joules.

It is a hypothetical engine that is presumable to have the highest efficiency of all engines in the universe.

The Carnot engine is the most efficient engine available.

If a heat engine runs in a Carnot cycle between reservoirs with temperatures of 1000 k and 400 k, as stated in the issue. It is discovered that it releases 20 j of heat to the cold reservoir per cycle.

The efficiency of the engine = 1 - 400/1000

                                               =0.6

Heat supplied = heat rejected + work done

The efficiency of the engine = 0.6 = work done/Heat supplied

                                               0.6 = work done/heat rejected + work done

                                                0.6 =W / 20 + W

The work done = 60 joules

Thus, the work done by the engine would be 60 joules.

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-4m/s^2 the velocity of a ball that rolled to the right 20 cm in 3 seconds

Vi = 20m/s

Vf = 0

t = (t2 - t1) = 8s -3s = 5s

Vf - Vi = a*5s

a = (0- 20m/s)/5s = -4m/s^2

Velocity is a measure of speed in motion or activity. A more concise word for celerity is speed. Physics uses the word "velocity" specifically to describe how quickly and in what direction an object's location changes. It is a vector quantity that expresses the speed and direction of a body's motion.

Velocity is the term for the rate at which a displacement changes. Acceleration is the measure of a change in velocity. Velocity is a vector quantity because it comprises both magnitude and direction. Acceleration is a vector quantity because it is the speed at which velocity varies.

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By using the blackbody radiation formula, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

We need to know about black body radiation to solve this problem. The energy radiated by a black body object is proportional to the area and the fourth power of temperature. It can be determined as

P = A . e . σ . T⁴

where P is power, A is surface area, e is emissivity, σ is Stefan Boltzmann's constant ( 5.67 x 10¯⁸ W/m²K⁴) and T is temperature.

From the question above, we know that

P1 = 10 watt

P2 = 100 watt

T1 = T1

By using the black body radiation formula, the ratio of temperature is

T1⁴ / T2⁴ = P1 / P2

Hence,

T1⁴ / T2⁴ = P1 / P2

T1⁴ / T2⁴ = 10 / 100

T1⁴ / T2⁴ = 1 / 10

T2⁴ = 10T1⁴

T2 = ⁴√(10T1⁴)

T2 = T1 x 10⁰'²⁵

Thus, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

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57.0 is the calculated value.

Any pair of non-zero digits separated by a zero is significant. The number 108.0097, for instance, includes seven significant digits. Every zero that is both to the right and left of a digit that is not zero and the decimal point has no significance. The number 0.00798, for instance, contained three significant digits. To calculate how many significant figures are in a number, use the three guidelines below: non-zero digits are always significant. Notable zeros fall inside the range of two significant digits. The importance of a final zero or subsequent zeros only applies to the decimal section.

Since there are only three significant figures in the operation, that would be the number to use: 8.00

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Answer:

b. A vector may have either magnitude or direction.

Explanation:

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Answer:

4 Meters per second

Explanation:

This is assuming that the object is tossed straight up and without an angle since your question did not provide one

Both the theoretical density and experimental value is 8.57g/cm3

The term crystal structure, in crystallography, denotes that the structure in which the atoms (ions or molecules) are attached are arranged in an ordered manner. The smallest repeating unit of the crystal structure is called a unit cell.

Given that:

The radius of Nb is given as R=0.1430nm

The density of Nb is given as d=8.57g/cm3

The atomic weight of Nb is given as M=92.91g/mol

Also, given that the structure is BCC.

The value of the number of atoms per unit cell in BCC is Z=2

The formula for the edge length of BCC structure is,

a=4R/(√3)

Substitute the given values

a=(4*0.1430 nm)/(√3)

=3.3024×10−8cm

The formula for the density of the Nb in BCC structure is,

d2=(Z×M)/(a3×NA)

Substitute the given values.

d1=(2×92.91g/mol)/((3.3024×10-8cm)3 × 6.022 × 1023 mol-1)

=(185.82g/mol)/(21.68cm3/mola3×NA)

=8.57g/cm3

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An incandescent light bulb has a power rating of 40 w when connected to a wall outlet of voltage 120 v. the resistance of the filament in the light bulb is 360 ohms.

The relation between power, voltage and current is :

                                   P =VI ...(i)

According to Ohm's law:

                                  I =V/R

Substituting the value of I in power relation

                                  P = [tex]V^{2}[/tex]/R

Since we have to find the resistance

                               R = [tex]V^{2}[/tex]/P ...(ii)

Given:

V = 120 V

P = 40 w

Putting the values in eq (ii).

R = [tex]120^{2}[/tex]/40

R = 360 Ω

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Answer:

Average kinetic energy per molecule in a substance

Explanation: