need help with # 5,6,&7 please, thanks

The specific heat capacity of silver is {c} = 0.24 J/(kg °C).

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 °C. Its units are J/(kg °C).

Given is that 55g of silver absorbs 197.9 joules of heat and the temperature rises by 15 °C.

Mathematically, we can write the specific heat capacity as -

Q = mcΔT

where -

{Q} → heat energy

{m} → mass

{c} → specific heat capacity

{ΔT} → change in temperature

We can write -

Q = mcΔT

197.9 = 55 x (15 - 0) x c

197.9 = 55 x 15 x c

c = 197.9/825

{c} = 0.24 J/(kg °C)

Therefore, the specific heat capacity of silver is {c} = 0.24 J/(kg °C).

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Expansion stroke refers to the forward motion of a steam engine piston.The steam has a pressure of 103.45 kPa.

Expansion stroke refers to the forward motion of a steam engine piston.The piston is propelled forward during the expansion stroke by the expansion of steam in the cylinder.Additionally moving is the piston's connecting crank shaft.

When the piston is expanding, the crankshaft's wheel rotates only halfway.

W = p * V is the formula, where W stands for work, p stands for pressure, and V is the change in piston volume.

We are aware of:

W = 0.6 J.

The piston measures 1.8 cm in diameter.

This indicates that r = 0.9 cm.

Since it moves 2.3 cm, a cylinder's height is given by h = 2.3 cm.

V = r2 h = 0.92 3.14 2.3 5.85 cm3 = 0.00000585 m3

The pressure is p = W/V = 0.6 J/0.00000585 m3 = 103,448.27 Pa, or p = 103.45 kPa.

The steam has a pressure of 103.45 kPa.

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Answer:

Radiometric dating is a method of dating rocks and minerals based on the decay of their radioactive isotopes. This method can be used to date rocks of any age, including those older than the Earth itself. However, some rocks are too old for radiometric dating, as the isotopes of certain elements have already decayed completely. Other methods of dating rocks and minerals include relative dating, which relies on stratigraphic relationships, and absolute dating, which relies on physical parameters such as the presence of uranium and thorium.

A. (i) The speed-time graph for cars P and Q is in the attachment.

(ii) The time when car Q overtook car P is 8.9 s.

(iii) Car Q is 25 ahead of car P when car P came to a stop.

B. (i) The distance from O when P overtakes Q is 22.4 m.

(ii) The distance between the vehicles after 5.0 s is 1 m. Car P is ahead of car Q.

The car is in uniform motion if the speed is constant. d = v × t

The car doing a non-uniform motion if the car increases or decreases its speed. Three formulas in non-uniform motion

where

a. In this problem

Car P

Car Q

Making speed-time graph

When car Q overtook car P both cars traveled the same distance

d car P = d car Q

(v₀ t + 0.5 at²) car P = (v₀ t + 0.5 at²) car Q

(20 × t)  + (0.5 × (- 2) × t²) = 0 + (0.5 × 2.5 × t²)

20t - t² = 1.25t²

0 = 2.25t² - 20t

0 = t (2.25t - 20)

t = 0  or  2,25t - 20 = 0

              2.25t = 20

              t = 20 ÷ 2.25
              t = 8.9 s

When car P stops at t = 10 s

B. In this problem

Car P moves in non-uniform motion

Car Q

When car Q overtook car P both cars traveled the same distance

Factorize t² - 2t - 2 = 0 using quadratic formula

After 5 s

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Answer:

The angle will be 180°.

hope that helps...

Answer:

F=ma

v-u=at

Explanation:

F=ma

v-u=at

The speed of light is 3 × 10⁸ m/s. Light will take a time of 500 seconds to travel a distance of 1.5 × 10¹¹ m.

Speed is a physical quantity used to measure the distance travelled by an object  per unit time. It is usually expressed in the unit m/s. Light is the fastest thing in the universe to be known.

The speed of light is the product of its frequency and wavelength. In general the ratio of the distance covered per time taken.

Speed of light  = 3 × 10⁸ m/s

distance from earth to sun =  1.5 × 10⁸km = 1.5 × 10¹¹ m

Now, the time taken by light to travel this distance is :

time = distance/speed.

t =  1.5 × 10¹¹ m / 3 × 10⁸ m/s = 500 seconds.

Therefore, the time taken by light from sun to reach earth surface is approximately 500 s.

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The maximum altitude reached is 500 km. The periodic time of the satellite is  1.175 hour.

A body's velocity is the rate at which its displacement alters with respect to time. A vector quantity with both magnitude and direction is velocity. The meter/second unit of measurement for speed.

The satellite is traveling at a speed of 36900 km/h in a path parallel to the surface of the planet.

There is no initial velocity component in the vertical direction.

Consequently, the highest altitude achieved was 500 km.

and the satellite's periodic time is equal to 2π×(6400+500)/36900 hours.

= 1.175 hour.

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Answer:

Yes, the object will turn.

Explanation:

The object will turn because there is an net clockwise moment of 5 Nm and an anti-clockwise moment of 10 Nm, resulting in a net clockwise moment of 5 Nm. According to the laws of physics, an object will rotate in the direction of the net torque acting upon it. In this case, the net torque is acting in a clockwise direction, causing the object to rotate in that direction.

The total momentum after the two balls collide remains conserved.

Given is that a cue ball rolls toward a billiard ball with a velocity of 1 m/s east. Both balls have identical masses.

For the elastic collision, the momentum remains conserved. So -

[tex]$m_{1}u_{1}+m_{2}u_{2}=m_{1}v_{1}+m_{2}v_{2}[/tex]

We can write -

{m} + {m} = m{v₁ + v₂}

{v₁ + v₂} = 2m/m

{v₁ + v₂} = 2

Therefore, the total momentum after the two balls collide remains conserved.

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The total distance travelled by the whale is 3 km.

The complete length of the path between any two points is called distance.

Displacement is the direct length between any two points when measured along the minimum path between them. It is a straight line joining initial and final points.

Given is that a whale swims due EAST for a distance of 6 km, turns around and goes due WEST for 1 km, and finally turns around again and heads 3 km due EAST.

The total distance travelled by the whale will be -

{d} = 6 km + 1 km + 3 km

{d} = 3 km

Therefore, the total distance travelled by the whale is 3 km.

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The electric field for a negative point charge near a positively charged plate attached below

While being directed from the left plate to the right plate, the electric field in the center of the two plates will equal the sum of the two electric fields produced by the plates.

Electrified fields Every point in space has the vector quantity E. The force that would be applied to a unit positive test charge if it were positioned at a specific location is represented by the electric field at that location.

Any charge can be affected by the electric force known as the electric field. The start fraction is equal to E with a vector on top, while the end fraction is equal to F with a vector on top divided by q.

N/C, Newtons/coulomb The dimensions of an electric field are N/Cstart text, N, slash, C, and end text. An electric field, F, with a vector on top, equaling q, E, and a vector on top can be used to represent the electric force.

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The charge stored in the capacitor is 9.94 x 10^-10 C.

The capacitance C of a parallel plate capacitor is given by the formula:

C = ε₀ε₁A / d

where ε₀ is the permittivity of free space (8.85 x 10^-12 C^2/Nm^2), ε₁ is the permittivity of the dielectric material (Teflon, with a value of 2.1 x 8.85 x 10^-12 C^2/Nm^2), A is the area of the plates (5.00 m^2), and d is the distance between the plates (0.121 mm = 0.121 x 10^-3 m).

Plugging in the values, we get:

[tex]C = ε₀ε₁A / d = (8.85 x 10^-12 C^2/Nm^2) (2.1) (5.00 m^2) / (0.121 x 10^-3 m) = 4.97 x 10^-10 F[/tex]

The charge stored in the capacitor is given by the formula:

Q = CV

where V is the voltage applied across the capacitor (2.00 V). Plugging in the values, we get:

[tex]Q = CV = (4.97 x 10^-10 F) (2.00 V) = 9.94 x 10^-10 C.[/tex]

So the charge stored in the capacitor is 9.94 x 10^-10 C.

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The dimensional formula of  physical quantity z is [T⁻²].

The definition of the dimensional formula is the correct statement of the physical quantity in terms of its fundamental unit.

The relation between physical quantities v,x, z and t is

v = (1/2)zxt

The dimensional formula of  physical quantity v is = [L/T] = [LT⁻¹]

The dimensional formula of  physical quantity x is = [L]

The dimensional formula of t is = [T]

Hence, the dimensional formula of z is  = [v]/[x][t]

= [LT⁻¹]/[L][T]

= [LT⁻¹L⁻¹T⁻¹]

= [T⁻²]

The dimensional formula of  physical quantity Z is [T⁻²] .

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a. the speed of the ultrasound in water is 1480 m/s

b. the wavelength of the ultrasound in water is 37 m

c. the depth of the fish below the boat is 89.76 m

a.

v = fλ

v = fλ = (4.0 x 10^2 Hz)(λ)

the speed of the ultrasound in water is given as :

v = v_water = 1480 m/s

substitute v_water into the equation above and solve for λ:

λ = v_water / f = (1480 m/s) / (4.0 x 10^2 Hz) = 37 m

Therefore,  the speed of the ultrasound in water is 1480 m/s and the wavelength is 37 m.

c. The depth of the fish below the boat ia found using,

d = v_water * t / 2

The first echo came back after 0.09 s:

d = (1480 m/s) * (0.09 s) / 2 = 64.32 m

This is the depth of the sea bed, which is already known to be 64 m. So the fish must be deeper than the sea bed, and the second echo must have come from the fish. The second echo came back after 0.12 s:

d = (1480 m/s) * (0.12 s) / 2 = 89.76 m

So the depth of the fish below the boat is 89.76 m

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Answer:

Explanation:

The mass of the human = x

a) EK=1/2x144= 72x

   EK=EP

72x=mgh

72x=x * 10 * h

h=7.2m

b) the world record in the pole vault = 6.2m

6.2<7.2

Answer: the melting point of iron alloys and the melting point of steel, occur at higher temperatures, around 2,200-2,500 Fahrenheit (°F) / 1,205-1,370 Celsius (°C). Melting points of copper alloys (including bronzes, pure copper, and brass) are lower than iron, at ranges around 1,675-1,981°F / 913-1,082°C.

Answer: Environmental factors are the abiotic factors that interact with and influence the biotic factors. The amount of carbon dioxide, and water clarity affects the sunlight reaching the aquatic organisms.

Answer:

According to special relativity, nothing can travel faster than the speed of light – an object with mass would require more energy to accelerate closer to the speed of light without actually reaching it.

Explanation:

Hope this helps!

Hypothetically somthing can match if not exceed the speed of light based on our perspective. I'll use Hubble's law for example (the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance). To us there are some galaxies so far away from us that they appear or should logically be moving away from us at the speed of light or greater. However the galaxies are not actually moving but rather the space in-between galaxies are expanding indefinitely. But because of our perspective it appers that the galaxies are going through space at unthinkable speeds.

The velocity of penny is 4 m/s with an acceleration of 9.8 m/s² within 8.42 s. Then, the height from which it fell down is 381 m.

Acceleration  of an object is the measure of its rate of change in velocity. It is a vector quantity having direction and magnitude. It is the ratio of change in velocity to the change in time.

Given velocity of the penny u = 4 m/s

acceleration = 9.8 m/s²

time = 8.42 s.

Then the height from which the penny is fell down is calculated as follows:

h = ut + 1/2 at²

h = 4 m/s × 8.42 s + 1/2 9.8 m/s² × 8.42 ×8.42 = 381 meters.

Therefore, the height from which the penny fell from is 381 m.

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The current reading on the ammeter A is 0.30 A.

A stream of charged particles, such as electrons or ions, travelling through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flowing through a surface or into a control volume is how it is calculated.

Charge carriers, which can be any of a number of particle kinds depending on the conductor, are the moving particles.

Current is scalar quantity and it follows the algebraic summation during addition.

The current reading on the ammeter A is = (0.20 A + 0.10 A) = 0.30 A.

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Subliminal (subconscious) vision is a deliberate process created by communication engineers, whereby you will receive and respond to information and instructions without realizing it. The messages that are in the printed words, pictures or even the sounds that are presented or introduced are either very fast or very subtle passing through your awareness and alertness.

Actually, information, or stimuli that can be consciously felt by humans can be evaluated, criticized, discussed, refuted and possibly rejected by viewers. Something that is subliminally programmed in the subconscious (unconscious) will not encounter such an obstacle. TV viewers may protest, or an image in cyberspace will be rejected. This subliminal information is predictably stored in your brain and is capable of influencing human judgment, and behavior.

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The change in length is directly proportional to the change in temperature. Here, if the temperature changes from  0°C to 32°C, the length of girder changes from 28 m to 31.2 m. Thus, length increases by 3.1 m.

As the temperature of a substance increases, the distance between its molecules increases as their intermolecular forces gets weaken at higher temperatures.

The solid substances, especially metallic parts undergo thermal expansion and we can observe a change in their length and gap formed in between. This is what called as thermal expansion.

The change in length l is directly proportional to the change in temperature.

given length of the girder at 0°C or 273 K  = 28 m

then length at  32°C  or 305 K = (305 × 28 )/273 K = 31.2 m

Therefore, the length of the girder will increases by 3.1 meters.

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The initial velocity u be the product of time t and acceleration due to gravity g thus u = gt. Then height that the ball can move with this velocity is 1/2 gt².

Velocity of a moving object is the measure of its distance travelled per unit time. Velocity is a vector quantity having both magnitude and direction. Acceleration is the rate of change in velocity.

Here, the initial velocity is given u. It is the product of acceleration g and time t. thus, u = gt.

The height travelled within the time t and acceleration g, is written as:

h = 1/2 gt²

Now, when the ball reaches its maximum height, its potential energy becomes equal to the kinetic energy.

that is, 1/2 mv² = mgh

therefore, h = v²/2g.

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To show an object's direction and location, motion maps are employed. The motion map provides the following information about the object's position and speed: With a high velocity, the object begins to travel away from the origin.

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Answer:

Sound waves travel faster through solids than through gases.

Explanation:

The speed of sound in a solid is determined by its elasticity and density. Solids are generally denser and more elastic than gases, so they can transfer the energy of a sound wave more effectively, leading to a faster speed of sound.

The speed of sound in a gas is influenced by its temperature, pressure, and composition. Gases are generally less dense and less elastic than solids, so they transfer the energy of a sound wave less effectively, leading to a slower speed of sound.

In general, the speed of sound in solids is about four to five times faster than in gases.

Answer: Solids.

Explanation: Because gas have molecules too far a part, the sound has issues traveling through it. On the other hand solids have the molecules very close together so the sound waves travel more quickly through it.

Sound waves travel over 17 times faster through steel than through air.

Basically, the more close together the molecules are, the faster the sound will spread.

If the movement of A13+ ions transfers 0.035 pC of charge, 72917 of these must have been transferred in total.

Three extra protons are present in each ion. As a result, the additional charge on each = C

Charge total = 0.035 pC

Q (total charge) = C

Let n be the number of ions.

In response to the question:

n×3×1.6×10∧-19=0.035×10∧-12

n=0.035×10∧-12/3×1.6×10∧-19

n=7.29167×10∧4

n = 72917

As a result, the total number of ions required for transfer is 72917.

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Answer:It is a system that supports the body, helps with movement, protects internal organs, and serves as a site for

blood cell formation.

Explanation: reason it is a system of which supports the body weight and holds your organs in without such a system theyd fly around damaging them due to such the answer is exactly as said it supports the body weight the movement of your legs and holds you up and it creates blood cells from your bome maro

Answer: The answer is: It is a system that supports the body, helps with movement, protects internal organs, and serves as a site for

blood cell formation.

Explanation: I have my ways ;>

The fourth harmonic of B matches the frequency of A 's first harmonic, and the distance is ¼fn.

What is frequency?

The number of waves that pass through a fixed point in a given amount of time is defined as frequency. If a wave takes 1/2 second to pass, the frequency is 2 per second. If it takes one hundredth of an hour, the frequency is one hundred per hour.

The hertz unit, named after the 19th-century German physicist Heinrich Rudolf Hertz, is typically used to measure frequency. The hertz measurement, abbreviated Hz, is the number of waves per second that pass by. An "A" note on a violin string, for example, vibrates at about 440 Hz (440 vibrations per second).

The n th resonant frequency of string A is

fn,A

= vA/2IA× n

= n/2L √τ/μ

while for string B it is

fn,B

= vB/2IB × n

= n/8L √τ/μ

= ¼fn,A

​Thus, we see f1,A = f4,B .

That is, the fourth harmonic of B matches the frequency of A 's first harmonic.

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