whats a watt
plz help

Answer:

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The car's speed at 10 s would be 20 m/s, and the final speed would be 40 m/s.

During the first 20 s, the car accelerates at a rate of 2 m/s², so its speed increases linearly. We can calculate the final speed at 20 s as follows:

a = 2 m/s²

t = 20 s

v = a * t = 2 m/s² * 20 s = 40 m/s

From 20 s to 60 s, the car continues at a constant speed, so the graph is a horizontal line at 40 m/s.

Therefore, the car's speed at 10 s is:

t = 10 s

v = a * t = 2 m/s² * 10 s = 20 m/s

And its final speed is 40 m/s

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(a) The perpendicular component of the block's weight is  86.6 N.

(b) The parallel component of the block's weight is 50 N.

(c) The magnitude and direction of the tension needed to move the block is 103.9 N upwards.

(d) The magnitude and direction of the block's acceleration  is 4.3 m/s² upwards.

The perpendicular and parallel component of the blocks weight is calculated as follows;

The perpendicular component of the block's weight is calculated as follows;

W (n) = W cosθ

where;

W (n) = 100 x cos(30)

W (n) = 86.6 N

The parallel component of the block's weight is calculated as follows;

W (p) = W sinθ

W (p) = 100 x sin (30)

W (p) = 50 N

The magnitude of the tension needed to move the block is calculated as follows;

T = F cosθ

where;

T = 120 x cos(30)

T = 103.9 N upwards

The acceleration of the block is calculated as follows;

T - Ff - W (p) = ma

where;

m = W /g

m = 100 N / 9.8 m/s² = 10.2 kg

T - Ff - W (p) = ma

103.9 - 10 - 50 = 10.2a

43.9 = 10.2a

a = 43.9 / 10.2

a = 4.3 m/s² upwards

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Answer:

Joule (J)

Explanation:

Joule (J) is the SI unit of heat energy (any energy - thermal, electrical, mechanical..).  It is named after the English physicist James Prescott Joule.

The renting car that is reported to achieve 10.1 km/L its mileage in miles/gal is: 23.75 miles/gal

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

Information about the problem:

Converting the units from km/L to miles/gal, we get:

10.1 Km/L * (1 miles / 1.60934 km) * (3.785 L  1 gal) = 23.75 miles/gal

10.1 Km/L is equivalent to 23.75 miles/gal

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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Answer:

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10 is the appropriate number. Here, a machine's mechanical advantage. Hence, choice (a) is the appropriate response. Three mechanical advantages exist: force, distance, and speed.

Although though force mechanical advantage is the sole topic covered in the majority of scientific publications, it is nevertheless crucial.

using the mechanical advantage formula.

\(MA= \frac{Fo}{Fi}\)

alternative ≠ 480\(N\) and \(Fi = 50n,\)

\(MA = \frac{480n}{50n}\)

simplify  \(MA\)  ≈  10

The load to effort ratio is used to quantify mechanical advantage of a machine. A machine's mechanical advantage determines its efficiency. Mechanical Advantage is equal to Load / Effort, or F 0 F I which means that is the mechanical energy, is the production force, and corresponds to the input force.

An object having mass changes its velocity in response to a push or pull. Force is an exterior agent that has the power to alter the rest or motion of something like a body. It has magnitude and direction.

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Answer:

a

Explanation:

occurs when the crest of one wave meets the trough of another wave as they travel from two different points in the same direction and at the same frequency

Explanation:

To find the volume of a pencil, you need to use the formula for the volume of a cylinder, which is:

V = πr²h

where V is the volume, π (pi) is a mathematical constant approximately equal to 3.14, r is the radius of the circular base of the cylinder (in this case, the radius of the pencil), and h is the height of the cylinder (in this case, the length of the pencil).

To find the radius of the pencil, you can measure the distance across the circular cross-section of the pencil at its widest point. Divide this distance by 2 to get the radius.

To find the length of the pencil, you can measure it from one end to the other end.

Once you have the radius and length, you can substitute these values into the formula for the volume of a cylinder and calculate the volume of the pencil in cubic units (e.g. cubic centimeters or cubic inches).

At a high altitude, water boils at 95°C instead of 100°C as at sea level because the air pressure is lower.

The boiling point of a liquid is the temperature at which its vapor pressure is equal to the external pressure acting on the surface of the liquid. At higher altitudes, the atmospheric pressure is lower due to the decreased weight of the air above. As a result, the vapor pressure of water increases, and it requires less heat to reach its boiling point. Therefore, water boils at a lower temperature at higher altitudes.

Options A, C, and D are incorrect because they do not affect the boiling point of water. The air pressure, on the other hand, plays a significant role in determining the boiling point of a liquid.

In summary, at a high altitude, water boils at 95°C instead of 100°C as at sea level because the air pressure is lower.

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A gravitational acceleration points in the direction of the gravitational field's source object.

involving or relating to the pull of two masses: The planet's gravitational pull is responsible for the ebb and flow of ocean tides. Strong propensity or movement towards something or someone, whether inherent or implied: Many studies have been conducted to determine why they are drawn to destructive behavior.

Gravity only comes in one variety. In nature, there is only one form of gravity. According to their masses and the separation between their centers, there is only one kind of gravity influence that draws the two bodies together. Gravity is the strongest force known to exist in nature and is a form of central force.

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True. Immediately after the switch is closed, current only flows through the capacitor and not through the resistor. This is because the resistor offers resistance to the current flow while the capacitor acts as a short in the circuit.

What is a RC circuit?

Consider the circuit diagram shown below. This circuit is known as an RC circuit. In an RC circuit:

Supposing that the capacitor has been kept uncharged for a long period of time, at this instant when the switch is closed, only the current flows through the capacitor and not through the resistor.

This is because the resistor offers resistance to current flow while the capacitor acts as a short in the circuit.

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When a light rain falls after oil and gasoline have leaked onto the road surface, it can cause the car to become less responsive and more difficult to control.

This is because the oil and gasoline act as a slippery layer on the road surface, which reduces the friction between the tires and the road. The rainwater can then mix with the oil and gasoline, making the layer even more slippery and reducing the vehicle's grip on the road.

To help mitigate this issue, drivers should be aware of their surroundings and the potential for slippery surfaces, and should adjust their speed and driving accordingly. Additionally, using tires with greater tread, or using more aggressive tires designed for wet and slippery conditions, can also help increase the vehicle's grip on the road.

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The frictional force when the box has a constant velocity of 6 m/s is -30 N

We'll begin by obtaining the acceleration of the box. This can be obtained as follow:

Acceleration = velocity / time

Acceleration = 6 / 2

Acceleration = 3 m/s²

Next, we shall determine the net force on the box. This is shown below:

Net force = mass × acceleration

Net force = 14 × 3

Net force = 42 N

Finally, we shall determine the frictional force. Details below

Net force = Force applied - frictional force

42 = 12 - frictional force

Rearrange

Frictional force = 12 - 42

Frictional force = -30 N

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We are asked to determine the net rate of radiation of a roof given its area and its emisivity. To do that we will use the following formula:

Where:

The Stefan-Boltzmann's constant is given by:

Now, we need to convert the temperature to Kelvin. To do that we use the following:

Where:

For the 33°C we have:

For the 14°C:

Now, we substitute the values:

Solving the operation:

Therefore, the net rate of radiation is -27870.84 Watts.

Answer:

it takes 64 J of heat energy to heat 2 kg of lead from 265 K to 315 K.

Explanation:

To find out how much heat is needed to heat 2 kg of lead from 265K to 315 K, we can use the formula for specific heat capacity, which is:

q = mcΔT

Where:

q = heat energy (in joules)

m = mass of the substance (in kilograms)

c = specific heat capacity of the substance (in joules per kilogram per degree Celsius)

ΔT = change in temperature (in degrees Celsius)

The specific heat capacity of lead is 0.128 J/g°C. we need to convert it to J/kg°C

So, the heat energy needed is:

q = (2 kg)(0.128 J/kg°C)(315 K - 265 K)

q = (2 kg)(0.128 J/kg°C)(50 K)

q = 64 J

Therefore, it takes 64 J of heat energy to heat 2 kg of lead from 265 K to 315 K.

The degree measure of angle ∠ bac will be 70°. Option C is correct.

The angle is the distance between the intersecting lines or surfaces. In addition, the angle is expressed in degrees. The angle is 360 degrees for a full revolution.

Given expression;

\(\rm cos^{-1}(\frac{3.4}{10})=x \\\\ x = cos^{-1}(0.34) \\\\ x = 70.12^0\)

The degree measure of angle ∠bac will be 70°.

Hence option C is correct.

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Answer:

70 Degrees

Explanation:

Geometry B E2020!! :3

Answer:

Chemical reactions occur slower at lower temperatures and faster at higher temperatures. When you put a glow stick in cold water, the chemical reaction slows down but will last for a longer period of time. When you put a glow stick in hot water, the reaction speeds up but will be over quicker.

Explanation:

(self-explanatory)

I hope this helps, have a nice day.

It will take about 12 days for the trekkers predict to walk from phakding to Everest base camp.

This is referred to as a form of movement which consists of walking for several days or several weeks and being entirely or partially self-sufficient.

The standard Everest Base Camp Trek is 130km round trip and is usually divided into 12 days which includes time and space for acclimatization to the region and then we have 8 days to get to Everest Base Camp and 4 days to get back which is therefore the reason why ythe predicted days will be 12 and is the correct choice.

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The problem involves finding the wavelengths of visible light produced by an electric current through an unknown gas. Finding the wavelengths involves calculating the grating spacing, λ, and θ, and evaluating the expressions to determine the corresponding values.

The problem states that passing an electric current through an unknown gas produces several distinct wavelengths of visible light. To find the wavelengths of the unknown spectrum, we observe that they form first-order maxima at angles of 23.7°, 30.1°, 34.7°, and 42° when projected on a diffraction grating with 10,000 lines per centimeter.

To find the wavelengths, we can use the formula:

λ = d * sin(θ)

where λ is the wavelength, d is the grating spacing (which is the reciprocal of the number of lines per centimeter), and θ is the angle at which the maximum occurs.

First, let's calculate the grating spacing:

d = 1 / (lines per centimeter)

Given that the diffraction grating has 10,000 lines per centimeter, the grating spacing is:

d = 1 / 10,000 = 0.0001 cm

Now, we can calculate the wavelengths using the formula:

λ = 0.0001 cm * sin(θ)

For the given angles of 23.7°, 30.1°, 34.7°, and 42°, we can substitute these values into the formula to find the corresponding wavelengths.

λ1 = 0.0001 cm * sin(23.7°)
λ2 = 0.0001 cm * sin(30.1°)
λ3 = 0.0001 cm * sin(34.7°)
λ4 = 0.0001 cm * sin(42°)

By evaluating these expressions, we can find the values of the wavelengths.

Remember to check the units and convert them if necessary to ensure consistent units throughout the calculation.

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For a given potential difference, a bigger resistance means a smaller current through a component.

Resistance in an electrical circuit is a measure of the opposition to the flow of electric current. It is measured in units of ohms (Ω) and is represented by the symbol R in electrical equations.

The amount of resistance in a circuit can affect the amount of current flowing through it and the voltage across it. In a simple circuit, resistance is primarily determined by the materials used in the circuit, such as the wires and the components.

In a more complex circuit, resistance can also be affected by the design of the circuit, including the number of components and the way they are connected. The resistance determines the current in the circuit.

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Work Shown:

density = mass/volume

d = m/v

d = (60 grams)/(3 cubic cm)

d = (60/3) g per cm^3

d = 20 g per cm^3

d = 20 g/cm^3

This means that each cubic centimeter of material has about 20 grams of mass.

A cubic centimeter is a cube that has all sides each 1 cm.

The density of the piece of metal is equal to 20 g/cm³ when the mass is 60 g and a volume of 3 cm³ of metal.

The density of a substance can be measured as the mass per unit volume of that substance. The average density is equal to the total mass of the substance divided by its total volume.

The formula for the density of the substance is represented as follows:

The density of material = Mass/Volume

The density of a material is an intrinsic property as it does not depend on its size and the S.I. unit of the density is Kg/m³. If the size of the substance increases, the mass increases as well but the density of the material remains the same.

Given, the mass of the metal, M = 60 g

The volume of the metal, V = 3cm³

The density of metal = M/V = 60 /3 = 20 g/cm³

Therefore, the density of a piece of metal is 20g/cm³.

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(d) 50N/C

The magnitude of the electric field at point 'P' is 50N/C.

It is derived from the basic concepts of Electrostatics. Coulomb's Law is the basis of relations in Electrostatics. It resembles Newton's Law of Gravitation.

Using the relation between Electric force, charge, and Electric field:

                                          F = qE

                                     200 = (4)E

                                          E = 50N/C  

It is widely used in the calculation of Electric Force and Electric Field. The S.I. Unit of the Electric Force is Newton. The S.I. Unit of the Electric Field is N/C. The S.I. Unit of charge is Coulomb.

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The density of the steam is 250g/m³.

d = M/V

Density is defined as d = m/v, where m stands for mass, and for volume. The unit of density that is most frequently used is grams per cubic centimeter. For instance, the density of Earth is 5.51 grams per cubic centimeter, while the density of water is 1 gram per cubic centimeter.

A material's density is determined by how much space a given amount of the substance occupies relative to its mass (volume). A substance's density is based on the mass, size, and arrangement of its atoms. Density (D) is defined as the substance's mass divided by its volume.

Given,

mass = 500g

volume = 2m³

density = 500/2

density = 250g/m³.

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Out of the quantum numbers, (c) ml or magnetic quantum number is fractional as opposed to being integers.

The quantum numbers given in the question are (a) n, (b) l, (c) ml, and (d) ms. Among these quantum numbers, the only one that can take fractional values is (c) ml, the magnetic quantum number.

Quantum numbers specify the properties of the atomic orbitals and the electrons in those orbitals. In other words, they describe values of conserved quantities in the dynamics of a quantum system.

The quantum number (a) n, called the principal quantum number, represents the main energy level or shell or the size of the orbital that an electron occupies in an atom. It takes on positive integer values (1, 2, 3, etc.), indicating the different energy levels available to electrons.

The quantum number (b) l, called the azimuthal quantum number or the orbital angular momentum quantum number, defines the shape of an orbital. It can take on integer values ranging from 0 to n-1. For example, if n = 3, l can be 0, 1, or 2.

The quantum number (d) ms, called the spin quantum number, describes the spin orientation of an electron. It can take only two values, either +1/2 or -1/2, representing the two possible spin states.

Now, let us focus on (c) ml, the magnetic quantum number. It describes the orientation of an orbital within a subshell. The value of ml ranges from -l to +l, including 0. For example, if l = 2, ml can be -2, -1, 0, 1, or 2. As we can see, ml can take fractional values if l is a non-integer.

In summary, out of the given quantum numbers, only (c) ml, the magnetic quantum number, can take fractional values, while the rest, (a) n, (b) l, and (d) ms, are all integers. Hence, the correct answer is Option (c) ml.

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Answer:

If you take A0 to be the initial sample of iodine-131, you will be left with. 12⋅A0=A02→ ... m24 hours=12.5%mo=12.5⋅10−2⋅mo

Explanation:

is that what u look for

Sample I-131 decays to 12.5% in 24.21 days.

Half-life, in radioactivity, is the amount of time needed for half of a radioactive sample's atomic nuclei to decay (change spontaneously into other nuclear species by emitting particles and energy), or, alternatively, the amount of time needed for a radioactive material's rate of disintegrations per second to decrease by half.

Give parameters:

Half-life of  the radioactive element I-131:T = 8.07 day

It decays to 12.5% means it decays to 1/8.

According to definition of half-life,

The radioactive element I-131 decays to half in 8.07 days.

So, the radioactive element I-131 decays to 1/8 in 3×8.07 days = 24.21 days.

Hence,  the radioactive element I-131 decays to12.5% in 24.21 days.

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The value of ay would be different if you used a metal ball of a different mass.

The acceleration due to gravity (ay) is equal to the force of gravity divided by the mass of the object, so if the mass of the object is increased, the acceleration due to gravity will be decreased. Therefore, if you used a metal ball that was ten times heavier, the acceleration due to gravity (ay) would be decreased by a factor of 10.
When using a metal ball of a different mass, the value of ay would be different. This is because acceleration is inversely proportional to mass, meaning that a heavier object will have a lower acceleration compared to a lighter object.

Therefore, the value of ay will be lower if a metal ball of ten times heavier mass is used compared to the original metal ball used

We know that force is given by:

F = ma

Where,

F: force exerted on the object

m: mass of the object

a: acceleration of the object

Therefore, we can rearrange the equation to get: a = F/m

From this equation, it is clear that acceleration is inversely proportional to mass. This means that a heavier object will have a lower acceleration compared to a lighter object. In the given case, if a metal ball of ten times heavier mass is used compared to the original metal ball used, the value of ay will be lower. This is because the force exerted on the object is the same, but the mass is ten times higher.

Hence, acceleration will be lower. Therefore, the value of ay will be different if a metal ball of different mass is used.

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The answer is C) 22.4 L if 3 moles of gas occupy at standard temperature and pressure.

The volume occupied by a gas at standard temperature and pressure (STP) can be determined using the Ideal Gas Law. The Ideal Gas Law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the universal gas constant, and T is the temperature in kelvin. At STP, the pressure is 1 atm and the temperature is 273 K.

So, if n = 3 moles of gas, and we substitute the values into the Ideal Gas Law, we get:

PV = nRT

P = 1 atm

n = 3 moles

R = 8.31 J/mole x K

T = 273 K

Therefore,

V = (nRT)/P = (3 * 8.31 * 273) / 1 = 22.4 L

Hence, the answer is C) 22.4 L.

A mole is a unit of measurement used in chemistry to express the amount of a substance. It is defined as the number of entities in a substance that is equal to Avogadro's number. These entities can be atoms, molecules, ions, electrons, or any other particle that makes up the substance. The mole is used to express the amount of a substance in a way that is proportional to its atomic or molecular weight.

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Answer:

Explanation:

The formula to find Potential Energy is PE = mgh, where m is the mass of the object, g is gravity, and h is the height from which the object can potentially fall. Because this is linear, then PE will increase as either the mass or the height increase (gravity is constant at 9.8 m/s/s). If the mass of the ball being dropped doesn't change, then the only thing that determines this ball's max PE is the height from which it is dropped; max PE ALWAYS occurs at the highest point from which an object can potentially fall. So your answer is "At the top".

Answer:

The normal force exerted on the skateboarder by the bump is less than the weight of the skateboarder

Explanation:

The given parameters are;

The location of the skateboarder = The top of the circular bump

The direction of motion of the skateboarder = Rightward

Therefore, given than the skateboarder has both horizontal angular motion (moving rightward) and vertical angular motion (over the bump), The effect of the weight of the skateboarder on the ground is reduced by the centripetal forces acting on the skateboarder and the normal force exerted on the skateboarder by the bump is equal to the reduced weight and is therefore less than the actual weight of the skateboarder.

The normal force exerted on the skateboarder is less than the weight due to the effect of centripetal force.

Given data:

The position of skateboarder is at top of the circular bump.

And direction of motion of Skateboarder is towards rightward.

Since, the skateboarder is undergoing the motion over the circular path, then it will have both horizontal angular motion (moving rightward) and vertical angular motion (over the bump).

The effect of the weight of the skateboarder on the ground is reduced by the centripetal forces acting on the skateboarder and the normal force exerted on the skateboarder by the bump is equal to the reduced weight and is therefore less than the actual weight of the skateboarder.

Thus, we can conclude that the normal force exerted on the skateboarder is less than the weight due to the effect of centripetal force.

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