a book is being pushed to the right across a desk at a constant speed. name the force depicted by the leftward arrow.

The time taken for the stone to reach the ground when it is thrown above the ground is 0.57 s.

Given that,

Velocity of the stone = 6.38 m/s

Height above the ground = 1.63 m

The time t at which the stone's vertical position y(t) becomes zero is the amount of time it takes for it to fall to the earth.

It is given by the formula, y(t) = 1.63 - 1/2* 9.81* t² = 0

1.63 - 4.9 t² = 0

4.9 t² = 1.63

t² = 1.63/4.9 = 0.33

t = 0.57 s

Thus, the time taken by the stone to reach the ground is 0.57 s.

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Answer: 1.25 A

Explanation:

I = R/V  (Ohm's Law)

I = 150 Ω / 120 V = 1.25 A

If a kiloparsec (kpc) is equal to 1000 parsecs, light years is a kiloparsec equal to: 3, 260 light years.

The distance that light travels in a light-year is one year. At 186,000 miles (300,000 kilometres) per second and 5.88 trillion miles (9.46 trillion kilometres) per year, light travels through interstellar space.

Since a light-year is the maximum distance light can travel in one year and nothing can move faster than that, the answer appears to be 13.8 billion light-years.

Thus, 3,260 many light years is a kiloparsec.

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-1.4m/s² is the negative acceleration when the car completely stops in a time of 50sec.

v=u+at in this v= final velocity u=  initial velocity , a = acceleration of the car and t= time

initial velocity of car u= 70m/s

final velocity of the car is v= 0 m/s after stop the car is in rest position

time t =50s, now substitute these values in equation

0=70+a(50)  which is -1.4 m/s².

here we got the answer in negative acceleration. Which is called as Deceleration.

Hence-1.4m/s² is the negative acceleration when the car completely stops in a time of 50sec

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Stars with a mass greater than 15 times that of the sun typically transition directly from the hr diagram to the red giant stage while maintaining a nearly constant luminosity.

A quantity that is supposed not to shift value in a particular mathematical debate is one that has a specific amount in a specific context, is true globally, or is a feature of some material or instrument.

A digit (0–9) or a period serves as the initial of a constant sign. A constant symbol's value cannot be altered. It is merely the string made up of the symbol's characters, all lowercase alphabetic characters having been converted to uppercase.

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The amount of light that passes through the three Polaroid filters in order is 12.5%.

Light is an adjective that describes something that isn't weighty, cumbersome, or depressing. A conversation topic or a music piece are both examples of things that can be considered light. The weight is light even though the trip is long, for instance.

Angle of transmission axis; θ = 45°

Formula for intensity of light from first polarizer is;

I₁ = ¹/₂I₀

Formula for intensity of light from second polarizer is;

I₂ = I₁cos²θ

Formula for intensity of light from third polarizer is;

I₃ = I₂cos²(90 - θ)

Combining the 3 equations;

Put ¹/₂I₀ for I₁ in second formula to get;

I₂ = ¹/₂I₀cos²θ

Put ¹/₂I₀cos²θ for I₂ in third formula to get;

I₃ = ¹/₂I₀cos²θ*cos²(90 - θ)

Plugging in 45° for θ gives;

I₃ = ¹/₂I₀cos²45*cos²(90 - 45)

⇒ I₃ = ¹/₂I₀cos²45*cos²45

⇒ I₃ = ¹/₂I₀cos⁴45

Now, cos 45 in surd form is 1/√2. Thus;

I₃ = ¹/₂I₀(1/√2)⁴

I₃ = ¹/₂I₀(¹/₄)

I₃ = ¹/₈I₀

I₃/I₀ = ¹/₈

I₃/I₀ = 0.125

In percentage form, we have;

I₃/I₀ = 12.5%

Light is a universally recognized metaphor for knowledge and rational reasoning; it is the antithesis of darkness or ignorance. The dark is almost usually thought to be ominous and dangerous, connected with things that cannot understand. According to legend, light dispels darkness and creates order from chaos.

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1. The atomic mass of the new atom be 252. Option (d) is correct.

2. The atomic number of the new atom be 100. Option (j) is correct.

3. The symbol of the new atom be Fm.  Option (e) is correct.

4. Beta decay is demonstrated here. Option (g) is correct.

A proton can change into a neutron or vice versa inside the radioactive sample's nucleus through a process known as beta decay. The radioactive sample's nucleus can approach the ideal neutron/proton ratio as closely as feasible through processes like beta decay and alpha decay.

The nucleus releases a beta particle during this process, which can either be an electron or a positron. Keep in mind that a proton can become a neutron or a neutron can become a proton. To follow the law of charge conservation, electron and positron are created. The weak contact that leads to beta-decay.

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Answer: yes

Explanation:

we may estimate that the storm's effects will last for about 9.3 days.

We were informed that a wave is produced in the south pacific ocean. Additionally, these phrases produce waves that have a 15 m/s speed and can travel 12,000 kilometres. These waves, which are produced in the southern Pacific, can travel this far. Therefore, we simply utilise the standard equation that T equals distance times speed at the time of combat. Therefore, we must translate this distance into metres. Thus, 12,000 times 1000 is greater than 15. As Pete lacks seconds, the results are revealed. Thus, this can be expressed as eight times ten, increased to five seconds. So let's convert to our words first. Therefore, in terms of us, we will find that this equals to ours be 222 points. In order to determine the approximate number of days, we need to divide the amount by 24. 9.3 approximately Therefore, we may estimate that the storm's effects will last for about 9.3 days.

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The conclusion that can be drawn from the energy transformation diagram is "the chemical potential energy is transformed into 75J of kinetic energy and 25J of heat energy".

option A is the correct answer.

The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.

This implies that energy is always conserved as it be converted from one form of energy to another. Such as;

In the given scenario such that 100 J of  potential energy is transformed to produce kinetic energy and the battery causes a fan to spin using 75 J of kinetic energy converted from the 100 J of potential energy.

We can conclude the following based on the given scenario;

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0.525 m³ minimum volume must the slab have for a 42.0 kg woman to be able to stand on it without getting her feet wet.

Add the biggest possible inaccuracy to each metric, then multiply to get the biggest volume you can. Subtract the largest potential mistake of each measurement, then multiply, to determine the smallest volume that can be produced.

1000 kg/m³ = density of water

920 kg/m³ = density of ice

BF = Woman Weight + Slab Weight

Pvg = 42 + Pvg

V = 42 kg / (1000 - 920)

V = 42 / 80

V = 0.525 m³

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Force required to hold ball completely submerged under water is calculated as 0.257 N.

Net upward force on any object in any fluid is called buoyant force . If buoyant force is greater than the object's weight, then the object will rise to the surface and float.

Given, ρ1 = 0.0835 g/cm3  and ρ2 =1g/cm3)

and radius = 3.81/2 cm = 1.9 cm

As, the volume of sphere = 4/3 π r3

and mass of sphere = 4/3 π r3 ρ1

So, weight of the sphere is 4/3 π r3 ρ1 g

Volume of water displaced = 4/3 π r3

As we know, buoyant force = 4/3 π r3 ρ2 g

= 4/3 π  * 1.9 * (1-0.0835) *9.81

= 257.66 * 10^-3

F = 0.257 N

Force required to hold it completely submerged under water is 0.257 N

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Answer:

a

Explanation:

20 m/sec fast would a 0.40 kg football have to be thrown to have a momentum of 8 kg m/s.

It is measured by "mass velocity," since momentum depends on velocity, and it also depends on the direction of the body's motion. Since velocity and mass are both scalar quantities, momentum is also a vector quantity.

Given that,

mass of football (m) = 0.40 kg

momentum (p) = 8 kg.m/sec

As we know,

p = mv

8 kg.m/sec = 0.40 kg × v

v = (8 kg.m/sec ÷ 0.40 kg)

v = 20 m/sec

Now, 20 m/sec fast would a 0.40 kg football have to be thrown to have a momentum of 8 kg m/s.

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The minimum force to start the block moving is 40N

Limiting friction occurs when the moving force and the force opposing motion are equal,any addition to the moving force will cause slipping. The limiting frictional force is proportional to the normal reaction between the contacting surfaces and is independent of the area of contact.

Therefore for an object to be stationary, the moving force is equal to force opposing it. In these scenario the minimum force to move a stationary object must be equal to the weight of the object. The weight of the object is 40N.

Therefore the minimum force to move the block is 40N.

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The observed frequency will be greater than the source’s frequency (option - A) is correct answer.

If the source and observer are moving simultaneously in either case—moving observer or moving source—you'll notice that the frequency increases. The frequency decreases if they are drifting apart. Whether the source is moving or the observer is moving will affect how much the frequency changes.

Although the waves move at the same speed, the frequency that is observed is affected by any relative movement between the source and the observer. The wavelength changes along with the observed frequency. When an observer and a source are moving in the same direction, the frequency rises and the wavelength falls.

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One batch of cookies need 1/2 pounds or 0.21 Kg. Thus, 12 batches of cookies need 2.61 kg of butter.

Mass of a substance is the measure of its total amount. Mass of a substance can be expressed in g, Kg, pounds, lbs etc. Each units can be interchanged with certain relations.

One pound of mass = 0.435 Kg.

Thus, 1/2 pound = 0.435/2 = 0.21 kg.

Given that one batch of cookies need 1/2 pounds or 0.21 Kg. Hence, the amount of butter need to prepare 12 batch of cookies is :

= 12 × 0.21 Kg = 2.61 kg.

Therefore, the mass of butter required for 12 batches of cookies is 2.61 Kg.

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Long-duration spacecraft use the potent rocket fuel LOX + LH as a propellant. The spacecraft's long-term survival in the outer solar system is ensured by the use of this propellant.

To be utilized on commercial space launch vehicles is the propellant Lox/LH2. For massive space rockets, liquid oxygen was the first, least expensive, safest, and ultimately favoured oxidizer. Its fundamental flaw is that it is only mildly cryogenic, making it unsuitable for military applications where speedy launch and storage of the missile's fuel are essential. All the top rocket thinkers agreed that liquid hydrogen was the theoretically ideal rocket fuel.

LH2 and LOX are fed into each engine's combustion chamber after being placed in the tanks and when the launch countdown approaches zero. When the propellant is lit, the hydrogen and oxygen react violently to create: water

O2 + 2H2 = 2H2O + Energy

Superheated water and enormous quantities of energy are released in this "green" process (steam). The water vapour expands and leaves the engine nozzles at speeds of 10,000 mph due to the hydrogen-oxygen reaction's intense heat.

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With a pressure head of 13.0 m and a 1.90 cm diameter tap, the volume rate of water flow is about. 3.97 × 10⁻³m³/s.

Given:

The faucet's diameter (d) is 1.90 cm (0.019 m).

Pressure head (h) = 13.0 m

The formula for the volume rate of flow (Q) through a pipe or faucet is given by:

Q = A × v

The radius of the faucet (r) is half of the diameter:

r = d / 2 = 0.019 / 2 = 0.0095 m

The cross-sectional area of the circular opening is given by:

A = π × r²

v = √(2 × g × h)

v = √(2 × 9.81 × 13.0)

v = √(254.46)

v = 15.95 m/s

Now, we have both A and v. Let's calculate the volume rate of flow (Q):

Q = A × v

Q = π × (0.0095)² × 15.95

Q = 3.97 × 10⁻³m³/s

With a pressure head of 13.0 m and a 1.90 cm diameter tap, the volume rate of flow of water is therefore about. 3.97 × 10⁻³m³/s.

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The complete question is:

What is the volume rate of flow of water from a 1.90- cm -diameter faucet if the pressure head is 10.0 mm?

Answer:

the Equionox

Explanation:

there are only teo times of the year when the earths axis

is tilted neither toward nor away from the sun, resulting on a nearly equal amount of daylight and darkness at all latitudes. these events are referred to as equionoxes

A solid-state detector converts part of the energy of the particles directly into electric current.

A semiconductor detector also known as a solid-state detector in ionizing radiation detection is a device that uses a semiconductor generally silicon or germanium to measure the effect of incident particles  (charged) or photons.

Semiconductor detectors have broad applications for gamma and X-ray spectrometry, radiation protection, and particle detectors. Solid-state detectors are sensitive to charged particles and are transparent to gamma rays.

Solid-state detectors offer a signal by collecting the charge released in the passage of the particle through a semiconductor. In these detectors, a semiconductor material such as a silicon (Si) or germanium (Ge) crystal constitutes the detecting medium.

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Due to gradient difference ir thermal image of the heated plate at a uniform temperature looks different in temperature scales

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Answer:

D. A decrease in its operating temperature

Answer:46m

Explanation:

Simply said, open and closed are infinite or finite. Its critical density is a factor for the geometry. The cosmos is closed (limited) and positively curved like the surface of a ball if the density parameter is larger than 1.

Since space expands exponentially during inflation, it is really pushed extremely swiftly toward critical density, which explains why we are so close to the critical mass density.

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For a closed universe, the angular diameter distance is not monotonic. This is because in a closed universe, the expansion rate is decelerating due to the gravitational pull of matter, causing light to bend and curve as it travels through the universe.

This curvature effect can cause the apparent size of objects to vary as a function of their distance, leading to a non-monotonic angular diameter distance.

On the other hand, for an open universe, the angular diameter distance is monotonic. This is because in an open universe, the expansion rate is accelerating due to dark energy, causing light to travel in straight lines and maintaining a constant relationship between the physical size of an object and its angular size as it moves further away. Therefore, the angular diameter distance increases monotonically with distance in an open universe.

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The correct statement is:

"The higher the value of the Hubble constant, the faster the universe is expanding and the younger it should be."

The Hubble's constant, named after American astronomer Edwin  Hubble, is a measure of the expansion rate of the universe. It is defined as the ratio of the speed at which a galaxy is moving away from an observer to its distance from the observer. We can use this constant to calculate the age of the universe by estimating how long it took the universe to reach its current size.

The higher the Hubble constant, the faster the galaxies are moving away from each other. This means that the universe is also expanding faster, so it should be younger. Conversely, a small value of the Hubble constant means that the universe is expanding slowly, and therefore must be older.

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The distance at which the crane lift a crate is 0.0781 m.

Distnace is the lenght between two points.

To determine the distance the crane can lift the crate, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the distance is 0.0781 m.

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