HEY CAN ANYONE PLS ANSWER DIS!!!!!!

Answer:

4 target heart rate. is the answer

Explanation:

hope its right

1.) Its angular speed is 6.28 rad/s.

2.) The speed of the tip of the hand 9.42 cm every second.

The angular speed of the second hand on a watch is calculated as the ratio of the circumference of the circle the hand follows to the total time taken to complete one rotation, typically measured in radians per second. The radius of the circle the second hand moves on is 1.5 cm. So, the circumference of the circle is 2π ×1.5 cm, which gives us 9.42 cm. Thus, the angular speed of the second hand is 6.28 rad/s.

The speed of the tip of the second hand can be calculated as the product of the radius of the circle it moves on and its angular speed. Thus, the speed of the tip of the second hand is equal to 9.42 cm/6.28s or 1.51 cm/s.

To express the answer in Angular Velocity, we would say the tip of the second hand has a rotational speed of 1.51 cm/s at an angular velocity of 6.28 rad/s. This means that the tip of the second hand spins around six times each second and covers a distance of 9.42 cm every second.

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The total of all classes' relative frequencies will always equal: (a) 1

A frequency is a measurement of how frequently a certain value, occurrence, or feature takes place. It is employed in a wide range of disciplines, including science, engineering, mathematics, and statistics. Frequency is often expressed as a number, percentage, or ratio. For example, a frequency chart might show the number of times a particular product was purchased over a certain time period. Frequency can also refer to the number of times a particular wave pattern occurs in a given time period. In physics and engineering, frequency is used to measure the number of cycles per second of a wave or periodic phenomenon. For example, a wave with a frequency of 440 hertz (Hz) has 440 complete cycles per second.

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The acceleration of the car is 3.56 m/s².

Rate of change of velocity with time, both in terms of speed and direction. A point or object going straight ahead is accelerated when it accelerates or decelerates.

Some characteristics of acceleration are-

The formula for acceleration is;

\(\bar{a}=\frac{v-v_{0}}{t}=\frac{\Delta v}{\Delta t}\)

\(\begin{aligned}&\bar{a}=\text { average acceleration } \\&v=\text { final velocity } \\&v_{0}=\text { starting velocity } \\&t=\text { elapsed time }\end{aligned}\)

The starting velocity is 3.50 m/s

The final velocity is 14.8 m/s.

The elapsed time is 3.17 s.

Substitute all the values in the formula of acceleration;

\(\bar{a}=\frac{14.8-3.50}{3.17}\\\bar{a}=3.56\)

Therefore, the acceleration of the car is 3.56 m/s².

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Answer:

1. The tightness of the wire has no effect on the strength of the electromagnet

2. The strength increases with the number of coils

3. The strength of the electromagnet increases with the number of dry cells used

4. The strength of the electromagnet increases with the wideness of the nail but not the length of the nail

Explanation:

The strength of an electromagnet is given by the following relation;

\(B = \dfrac{\mu_0 \cdot K \cdot N \cdot I}{L}\)

Where;

B = The magnetic field strength at the center

μ₀ = The magnetic permeability of free space = 4·π × 10⁻⁷ N·A⁻²

N = The number of loops formed by the conductor around the core

I = The current flowing through wire coiled around the nail

K = The magnetic permeability of the nail

L = The length of the coil

Therefore, we have;

1. From the above equation, the tightness of the wire coil around the nail (or the radius, 'R', of the wire) does not does not affect the magnetic field strength

2. The number of coils, 'N', is directly related to the magnetic field strength, 'B', and therefore, increasing the number of turns or coils around the nail, increases the magnetic field strength

3. The current in the circuit is directly related to the magnetic field strength and the number of dry cell used increases the current in the circuit and therefore, can increase the magnetic field strength

4. The size of the nail used in a solenoid and the magnetic field strength are directly related. The wider the nail, the stronger the magnetic field

Answer:

34.34 °C

Explanation:

From the question,

Heat lost by the silver block = heat gained by the iron block.

cm(x-y) = c'm'(y-z)................... Equation 1

Where c = specific heat capacity of the silver block, m = mass of the silver block, c' = specific heat capacity of the iron, m' = mass of the iron. x = initial temperature of the silver block, z = initial temperature of the iron,  y = final temperature of the mixture.

make y the subject of the equation

y = (cmx+c'm'z)/(cm+c'm')............... Equation 2

Given: c = 50 g, c = 0.2350 J/g·°C, x = 100°C, m' = 50 g, c' = 0.4494 J/g.°C, z = 0°C

Substitute these values into equation 2

y = [(50×0.2350×100)+(50×0.4494×0)]/[(50×0.2350)+(50+0.4494)]

y = 1175/(11.75+22.47)

y = 1175/34.22

y = 34.34 °C

Metallic bonding contributes to characteristic properties such as conductivity, malleability, ductility and others of metal due to their presence.

Metallic bonding is characteristic of metals where electrons and postive charges in metal participate in bonding. It has multiple significance such as it provides electrically conductive nature to the metal. The free delocalized electrons move under the influence of applied voltage giving the property of conductivity.

They are also responsible for thermal conductivity. The metallic bonding can also be attributed to malleability, ductility, strength, toughness and metallic luster.

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Answer: 137.14 kg

Explanation: F=ma (Force = mass x acceleration)

So, 48N (newtons) = m×0.35m/s²

N = kg (m/s²)

      (48 kg m/s²)÷0.35m/s² = m

      137.14 kg

 note: answer is to the nearest hundredth because of the .035 m/s²

Answer:

it is chemical energy

Explanation:

that is the energy used by our body, so it is the one that we will loose. and the energy that we gain is also chemical energy

It is 1.93 metres away from the post.

for vertical motion

\(S= u t + \frac{1}{2} g t^{2}\)

S = 0 +  \(\frac{1}{2} g t^{2}\)

1.7 = \(\frac{1}{2} 9.8 t^{2}\)

t = 0.589 sec

using law of  conservation of momentum, on the horizontal motion

\(m_{bullet} \ v_{bullet i} = m_{bullet} \ v_{bullet f} + m_{tin} \ v_{tin}\)

\(0.0020 = 0.0020 \ 3 \ 720 + 0.11 \ v_{tin}\)

\(v_{tin}\) = 3.273 m/s

S = \(v_{tin} \ t\)

   = 3.273 m/s * 0.589 s

   = 1.93 m

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In the peak of summer, it hasn't rained in a week, and the plants are looking rough, so watering the plants for an hour is a good idea.

However, the next day, you come back to the garden, and the plants look in worse shape than they did previously, as if none of that water made it to the plant. Plants absorb water through their roots. The root system of a plant is responsible for drawing water and nutrients from the soil. A plant's root system must be able to absorb water quickly in order for the plant to grow and thrive. When the soil around the root system is dry, the roots will stop growing and will not be able to absorb water.

It may even start to die. Watering plants during the peak of summer is important because it will help keep the soil moist and prevent the roots from drying out. However, watering a plant too much can be harmful. If a plant is overwatered, the water may not be able to penetrate the soil and reach the roots. Instead, it may just sit on top of the soil, causing the roots to rot and die. This can cause the plant to wilt and die.To summarize, if the soil around the plant is too dry, the roots may not be able to absorb the water you gave them, causing the plant to look worse than before. Conversely, overwatering can also be harmful because the water may not be able to penetrate the soil and reach the roots, causing the roots to rot and die.

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i. The magnitude of F, given that the box is moving at constant speed of 2 m/s is 24.5 N

ii. The magnitude of F, given that the box is moving at constant acceleration of 0.5 m/s² is 2.5 N

We can obtain the magnitude of F when the box is moving at constant speed of 2 m/s can be obtain as follow:

F = mgSineθ

F = 5 × 9.8 × Sine 30

F = 5 × 9.8 × 0.5

Magnitude of F = 24.5 N

We can obtain the magnitude of F when the box is moving at constant acceleration of 0.5 m/s² can be obtain as follow:

F = ma

F = 5 × 0.5

Magnitude of F = 2.5 N

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Answer:

B.  10 m

Explanation:

f = v/λ = (20 m/s)λ / (5 m) = 4 Hz    original frequency

1/2(4 Hz) = 2 Hz   half the original frequency

(20 m/s) / λ = 2 Hz

λ = (20 m/s) / (2 Hz) = 10 m

The second wavelength would increase to 10 m

The proportion of kinetic energy to power in dimensions is [T].

The following determines the object's kinetic energy:

E = ½mv²

The mass formula in dimensions is [m] = [M].

The dimensional velocity formula is [v] = [LT-1].

Kinetic energy's dimensional formula is [K] = [ML2T-2].

Power is the amount of work completed each second. It comes from:

P = W / t

[W] = [ML2T-2] is the dimensional formula for work done.

The time dimension formula is [t] = [T].

The dimensionless power equation is [P] = [ML2T-3].

The kinetic energy to power ratio is [K]/[P] = [ML2T-2] / [ML2T-3].

[K] / [P] [T]

Therefore, [T] is the ratio of the dimensions of kinetic energy to power. This is the necessary remedy as a result.

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Answer:

don't know I is not am studnt

Here, we are required to determine how the linear momentum of the body changes if the mass of the body is tripled and its velocity becomes doubled.

The linear momentum of the body would increase by a factor of 6.

The linear momentum of a body is the product of its mass and it's linear velocity.

As such, when the mass of the body is trippled i.e ×3

And it's velocity is doubled i.e x2

Consequently, it's linear momentum is increased by a factor of 6 resulting from the multiplication of 3 by 2.

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The correct statement is B.

A higher mode number means a shorter wavelength.

What is Wavelength?

Wavelength is an important characteristic of all types of waves, including electromagnetic waves (such as light and radio waves) and mechanical waves (such as sound waves and water waves). In general, the wavelength of a wave is determined by the source of the wave, the medium through which it travels, and the frequency of the wave.

The correct statement is B. A higher mode number means a shorter wavelength.

In both cases, the mode number refers to the number of segments, or nodes, into which the wave can be divided. The wavelength, on the other hand, refers to the distance between two adjacent peaks or troughs of the wave.

When the mode number increases, the number of segments or nodes in the wave increases, which means that the wavelength must decrease in order to maintain the same frequency of the wave. This is because the total length of the string or tube remains the same, and so the length of each segment must decrease as the number of segments increases. Therefore, a higher mode number corresponds to a shorter wavelength.

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The main source of solar energy is nuclear fusion.

The equation of the nuclear fusion reaction in the sun is :

H + H → D + β + + ν, where β + represents a positron and ν stands for a neutrino.

There is a tremendous amount of energy released from the sun because nuclear fusion reaction reactions produce a large amount of energy due to a mass defect.

The Sun and other stars undergo nuclear fusion, which is the merging of two atomic nuclei to create a single, larger nucleus.

Both reactions produce significant quantities of energy, but nuclear fusion produces significantly less radioactive waste and has a much higher energy yield.

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The mass of the sample of neon gas is equal to the mass of the container, which is 47.2 g.

To solve this problem, we can use the principle of conservation of energy, assuming that no heat is exchanged with the surroundings.

We'll use the equation:

Q_neon + Q_container = 0,

where Q_neon represents the heat gained or lost by the neon gas and Q_container represents the heat gained or lost by the container.

The heat gained or lost by a substance can be calculated using the equation:

Q = mcΔT,

where Q is the heat, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

Let's calculate the heat gained or lost by the neon gas:

Q_neon = m_neon × c_neon × ΔT_neon,

where m_neon is the mass of the neon gas and c_neon is its specific heat capacity.

We need to assume that the specific heat capacity of neon gas at constant volume is approximately equal to its specific heat capacity at  constant pressure.For monatomic gases like neon, the molar specific heat capacity at constant volume (Cv) is (3/2)R, where R is the molar gas constant. The molar specific heat capacity at constant pressure (Cp) is (5/2)R.

Since we have the molar mass of neon, we can calculate the molar gas constant (R) as follows:

R = 8.314 J/(mol·K).

The mass of neon gas can be determined using its molar mass (M) and the number of moles (n):

m_neon = n × M.

The number of moles can be obtained from the ideal gas law:

PV = nRT,

where P is the pressure, V is the volume, T is the temperature, and R is the molar gas constant.

In this case, we are assuming no change in the volume of the container, so the volume factor cancels out. Therefore, we don't need to consider the volume in our calculations.

Now let's calculate the heat gained or lost by the container:

Q_container = m_container × c_container × ΔT_container,

where m_container is the mass of the container and c_container is its specific heat capacity.

Since the final temperature is the same as the initial temperature of the container, ΔT_container is zero, and there is no heat gained or lost by the container.

Returning to the conservation of energy equation:

Q_neon + Q_container = 0,

we have:

Q_neon + 0 = 0,

Q_neon = 0.

Since Q_neon is zero, it means that no heat is gained or lost by the neon gas. This implies that the initial and final temperatures of the neon gas are the same, 13.0°C.

Now, let's calculate the mass of the neon gas:

m_neon = n × M,

where n is the number of moles.

To find the number of moles, we can use the ideal gas law:

PV = nRT,

where P is the pressure and R is the molar gas constant.

Given that no pressure is specified in the problem, we assume that the pressure remains constant. Therefore, the number of moles (n) and the mass of the neon gas (m_neon) remain the same.

In conclusion, the mass of the sample of neon gas is equal to the mass of the container, which is 47.2 g.

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Answer:

Chemical energy is converted into mechanical energy

Explanation:

Chemical energy stored in the bonds of hydrocarbons is released as heat which drives the piston in a car to produce circular motion that propels the car.

Answer:

I think it might be umm... b

The correct answer is actually D

Explanation: i got it right on my district assignment! :)

The energy emitted per minute by the blackbody at the given area is 170,724.8 J/min.

The energy emitted per minute at the given area is calculated as follows;

P = σAT⁴

P = (5.67 x 10⁻⁸) x (2) (398)⁴

P = 2845.41 W = 2845.41 J/s

Convert energy emitted per second to per minutes

P = 2845.41 J/s x (60 s / min) = 170,724.8 J/min

Thus, the energy emitted per minute by the blackbody at the given area is 170,724.8 J/min.

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Answer:

Horizontal component = 60.05 m/s

vertical component = 22.96 m/s

Explanation:

cosine(angle) = adjacent / hypotenuse or  horizontal / angled velocity

angled velocity * cosine (angle) = horizontal velocity

65 m/s * cosine(22.5) = 60.05 m/s

sine(angle) = adjacent/ hypotenuse or vertical/ angled velocity

angled velocity * sine (angle) = vertical velocity

65m/s sine(22.5) = 22.96 m/s

The work done by the force field on a particle that moves along the parabola is 7/3 + (e²-e)/2

The work done is defined as the magnitude of the displacement d multiplied by the force component acting in the direction of the displacement.

Work done = \(\int\limits^0_C {F} \, dr\)

dr = dxi  + dyj

Given,

F(x,y) = x²i + yeˣj

Work done =   \(\int\limits^0_C\)(x²i + yeˣj)×(dxi  + dyj)

=   \(\int\limits^0_C\)x²dx + yeˣdy

As, C: x = y² + 1

y = \(\sqrt{x-1}\)

dy = \(\frac{dx}{2\sqrt{x-1} }\)

Now substitute the values of y and dy:

Work done =   \(\int\limits^0_C\)x²dx + \(\sqrt{x-1e^{x} }\) × \(\frac{dx}{2\sqrt{x-1} }\)

=  \(\int\limits^0_C\)x² + ¹/₂ eˣ dx

Now, work done = \(\int\limits^1_2 {x^{2} }\) +  ¹/₂ eˣ dx

= [x³/3 + ¹/₂ eˣ]²₁

= [2³/3 + ¹/₂ e²] - [1³/3 + ¹/₂ e¹]

= 8/3 + ¹/₂ e² - 1/3 + e/2

= 7/3 + (e²-e)/2

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Complete question is as follows:

Find the work done by the force field F(x,y) = x²i + yeˣj on a particle that moves along the parabola x=y²+1 from (1, 0) to (2, 1)

Answer:

Chemical changes cause a substance to change into an entirely substance with a new chemical formula.

Explanation:

Chemical changes are also known as chemical reactions. The “ingredients” of a reaction are called reactants, and the end results are called products.

Answer:

Static friction: Keeps objects from sliding

Kinetic energy: Simply walking

Explanation:

Answer:

Friction and Inertia

Explanation:

Friction - Friction causes a force on a surface which is in the opposite direction to its motion. Example: applying the brakes in a car.

Inertia - An object will stay in motion and an object at rest will stay at rest unless acted upon by an outside force. Example: Why your book stays still on the table if you don't touch it, or why you shoot forward when brakes are applied in a car.

The total energy stored in the spring at the new stretched length can be calculated using the formula for the potential energy of a spring, which is 1/2*k*x^2, where k is the spring constant and x is the displacement from the equilibrium position.

In this case, the displacement is 5 cm + 5 cm = 10 cm and the spring constant is 200 N/m. Converting the displacement to meters, we get x = 0.1 m. Therefore, the total energy stored in the spring is 1/2*(200 N/m)*(0.1 m)^2 = 1 J.
Here's the step-by-step explanation:

1. The object is suspended at rest from a spring, causing it to stretch 5 cm longer than its unstretched length. Using Hooke's Law, we can find the force exerted by the spring: F = kx, where F is the force, k is the spring constant (200 N/m), and x is the stretch (5 cm = 0.05 m). So, F = 200 × 0.05 = 10 N.

2. The person exerts an additional force, stretching the spring another 5 cm (0.05 m). The total stretch now is 10 cm (0.1 m).

3. To find the total energy stored in the spring, we can use the formula for the potential energy of a spring: U = (1/2)kx^2. Using the total stretch, x = 0.1 m, and the spring constant, k = 200 N/m, we can calculate the total energy stored: U = (1/2) × 200 × (0.1)^2 = 1 Joule.

The main answer is: The total energy stored in the spring at the new stretched length is 1 Joule.

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Answer: The watermelon

Explanation: The watermelon has a larger mass than the rest of the three.

Answer:

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.........Answer.........

Given:-

u = 0.3 m/s

v = 5.5 m/s

t = 5 seconds

Explanation:-

Case-1

Acceleration = ?

From the first law of motion.

v = u + atv=u+at

a = \frac{v - u}{t}a=

t

v−u

a = \frac{5.5 - 0.3}{5}a=

5

5.5−0.3

a = \frac{5.2}{5}a=

5

5.2

a = 1.04a=1.04

\boxed{\boxed{a = 1.04 m/s^2}}

a=1.04m/s

2

So,the acceleration produced is 1.04 m/s^2.

Case-2

Distance travelled = ?.

From second equation of motion.

s = ut + \frac{1}{2} a {t}^{2}s=ut+

2

1

at

2

s = 0.3 \times 10 + \frac{1}{2} \times1.04 \times 100s=0.3×10+

2

1

×1.04×100

s = 3 + \frac{1}{2} \times 104s=3+

2

1

×104

s = 3 + 52s=3+52

s = 55 \: meterss=55meters

\boxed{\boxed{s = 55 meters}}

s=55meters

So,the distance travelled is 55 meters.

Explanation:

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Answer:i think it’s D

Explanation: