which of these stars has the greatest surface temperature? which of these stars has the greatest surface temperature? a 30msun main-sequence star a supergiant a star a cepheid variable star

Answer:

Explanation:

V₀ = 0 m/s

V = 41 m/s

S = 480 m

___________

a - ?

Distance traveled:

S =  (V² - V₀²) / (2*a)

Acceleration :

a = (V² - V₀²) / (2*S)

a = (41² - 0²) / (2*480) = 1.75 m/s²

The rain's speed relative to the car is Vrc = 89.28 km/h.

Given that the car is moving eastward and that raindrops are falling vertically with respect to the Earth at a constant speed,

Let us consider the x-axis in the East and n-axis in the vertically upward direction. Now the x component of the car velocity relative to the earth is

Vceₓ = 122 km/h

Vceₓ = 33.89 m/s

n component of the car velocity relative to the earth is

Vceₙ = 0 m/s

x component of the raindrops velocity relative to the earth is

Vreₓ = 0 cos45°m/s

Vreₓ = - 3.68 m/s

n component of the raindrops velocity relative to the earth is

Vreₙ = ?

calculate the drop's velocity in relation to the earth

tanθ = Vreₙ / Vreₓ

Vreₙ = Vreₓ x tanθ

Vreₙ = 33.89 m/s x tan60°

Vreₙ = 58.69 m/s

Vreₙ = -211.28 km/h

And hence, the rain's speed relative to the car is

Vrc = Vce + Vre

Vrc = 122km/h - 211.28 km/h

Vrc = 89.28 km/h

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The experiment is not accurate since the both rats get the tranquilizer and there is no control setting.

The quest for data and information is what would cause a scientist to perform an experiment. We know that an experiment is one that an experiment is one that we have to find the effect of the independent variable on the dependent variable.

In this case, the independent variable is the administration of the dose of the drug while the dependent variable is the number of hours that the pet rats are made to sleep.

Let us note that an experiment ought to have a control setting. The control setting of the experiment is what would serve to validate the experiment as we know. We can see that this experiment does not have a control setting therefore it is not accurate. This experiment would need to be reviewed a control setting should be added.

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The time taken by the ball to hit the ground will be 14.28 seconds.

Using Newton’s laws of motion, we have

H= (1/2)gt^2. Using H= 1000m

1000= (1/2) x 9.8 x t^2

Hence, t= square root of 2000/9.8 = 14.28 seconds (approx.)

The force that pulls items toward the center of a planet or other entity is called gravity. All of the planets are kept in orbit around the sun by gravity.

The acceleration of gravity near Earth's surface is approximately 9.81 m/s2 (32.2 ft/s2) when air resistance is disregarded, which means that the rate of an object falling freely will increase by 9.81 m (32.2 ft) per second each second.

The gravity is zero at infinite height.

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Answer:

He instantly stops the engine and applies the brakes so as to stop it within 1 m of the child. Calculate time required to stop it. (Ans. 4.5 s]

C. If a car has a westward acceleration, the car moving east and slowing down.

Westward acceleration is the acceleration of an object directed towards the west of the object's motion.

The acceleration of an object is defined as the change in the velocity of an object with time.

Mathematically, the acceleration of an object is given as;

a = Δv/Δt

where;

a = (v - u) /t

where;

When the car is slowing down, it implies that the final velocity is smaller compared to the initial velocity.

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The change in the energy of the water in the process is 52Btu, when 65 btu of heat is transferred to the water and heat losses from side walls.

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It would be a diode, also called a rectifier. It's used in electronic circuits to control the flow of current between two points.

Individual electronic parts, such as resistors, transistors, capacitors, inductors, and diodes, are connected by conductive wires or traces that allow electric current to pass through them to form an electronic circuit. It is a particular kind of electrical circuit, and typically at least one active component is required for it to be called an electronic circuits as opposed to an electrical one. Signals may be amplified, calculations can be made, and data can be sent from one location to another thanks to the combination of components and connections.

Typically, an electronic circuits can be classed as an analogue, digital, or mixed-signal circuit within rectifiers. The MOSFET is the semiconductor component utilised in electronic circuits the most (metal-oxide-semiconductor field-effect transistor).

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The mass of the ammonia is equal to 0.215 kilograms.

First of all, we would have to determine the volume of the metal sphere which is half-filled with ammonia. Mathematically, the volume of a sphere can be calculated by using this formula:

Volume = 4/3 × πr³

Where:

r represents the radius.

Substituting the given parameters into the formula, we have;

Volume of metal sphere = 4/3 × 3 × 0.5³

Volume of metal sphere = 4/3 × 3 × 0.125

Volume of metal sphere = 4 × 0.125

Volume of metal sphere = 0.5 cubic meter.

For the volume of ammonia, we have:

Volume of ammonia = 0.5/2

Volume of ammonia = 0.25 cubic meter.

Mathematically, the mass of a substance can be calculated by using this formula:

Mass = Density × Volume

Mass = 0.86 × 0.25

Mass = 0.215 kilograms.

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The speed of the current in m/s for a paddle wheel with a radius 0.40m and rotates at 100rpm is 41.88.

The linear velocity v and angular velocity w (in radians per unit time) are related by:

where r is the radius.

First, we convert the angular velocity to rad/s:

w = 100rev/100 * 2πrad/1rev * 1min/60s = (100π/3) rad/s

Substitute r = 0.40m and w =  (100π/3) rad/s

v = 0.40 (100π/3)

v = 41.88/s

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The magnitude is 5km and the direction of the truck is 53.13° from his starting point to current position.

The maximum size and direction of an object are referred to as the object's magnitude in physics. Vector and scalar quantities both use magnitude as a common denominator.

Scalar quantities are understood to be those that have only magnitude, according to their definition. Vector quantities, on the other hand, are those that have both magnitude and direction.

A truck moves northeast covering 4 kilometre and then turns northwest covering 3 kilometres which makes the turn a 90°

Let the magnitude of displacement be c then

⇒ c² = a² + b²                            (Pythagoras theorem)

⇒ c = √(a² + b²)

       = √(4² + 3²)

       = √(25)

       = 5 km

The magnitude is 5km

The direction of the truck will be given by

⇒ tan⁻¹(a/b)

⇒ tan⁻¹(4/3)  = 53.13°

Thus, The direction of the truck is 53.13° from his starting point to current position

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The engine's efficiency of the carnot engine is 31%.

The work done per cycle in kilojoules is 16kj.

Using the data supplied above,

Heat absorbed by the engine = 52 kJ

Heat exhausted by the engine in each cycle = 36 kJ

We need to find the efficiency of the engine. It is calculated by the formula.

η = 1 - output/input

Where,

η = Heat Engine Efficiency

Output = 36

Input = 52

η = 36/52

η = 1 - 0.69

η = 0.31

Convert to percentage

η = 31%

b) The work done per cycle in kilojoules

To find the work done per cycle:

W = heat extracted - heat exhausted

W = 52 -36

W = 16

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The normal force that the floor exerts on the sled is 7557 N when is pulled across a stone floor with a coefficient of kinetic friction of 1.7.

Here using the formula F = - Uk mg/cos θ - Uksin θ

= -1.7 x 500 x 10/ cos55° - 1.7 sin 55°

= 7557 N

The normal force of 7557 Newton is exerted on the floor by the sled.

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The object's speed reaches a maximum value and stays there if you drop it and it falls far enough for this to occur.

The speed of an object, also known as v in kinematics, is a scalar quantity that refers to the size of the change in that object's position over time or the size of the change in that object's position per unit of time.  An object's average speed during a period of time is calculated by dividing its distance traveled by the length of the interval, the instantaneous speed is the maximum possible speed as the interval's duration gets closer to zero. Velocity and speed are different concepts.

Distance divided by time is the dimension of speed. Although the meter per second (m/s), the SI measure of speed, is the most often used unit of speed.

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A Van De Graaf generator is an electrostatic generator and may collect a large enough charge to produce an electric current. Option A.

A Van de Graaff generator is an electrostatic generator that uses a moving belt to store charge in hollow metal spheres on insulating posts, producing very high potentials. Produces direct current (DC) at low currents and very high voltages.

Van de Graaff generator the motor turns silicone rollers to move rubber bands. As the belt moves, electrons are transferred from the rubber belt to the silicone roller charging the belt positively and the roller negatively. Van de Graaff generators extract electrons from the Earth move them along belts and store them in large spheres. These electrons repel each other and try to separate as much as possible by spreading over the surface of the sphere.

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Using speed and distance relation, It take the speed of 299 m to travel 30 cm .

speed is the rate at where someone or something moves is able to operate.

Let us convert cm to m for distance

C = 2.998× 10^8 ms

The relationship between distance, speed, and time is

T =1 ×10^6/8

Because in this case you are being asked how long or time it takes, make it the subject.

Rounding the quotient produces.

Adjust it again to fit the scientific notation.

The result is -

d= c×t

d=2.998×10^8 m/s 10^6 m/s

d=2.998

As a mathematical expression, the time taken for light is 2.998

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The average speed of a body traveling on a road is 6.5 km/h.

What speed is typical? The total distance something has traveled is divided by the total amount of time it took to traverse that distance to arrive at its average speed. Speed is the current rate of movement of something. Average speed refers to the pace that a vehicle travels at on average throughout a trip.

Meter per second is the S.I. unit of speed. In km/h, speed is also expressed.

Average Speed is calculated as Total Distance x Total Time.

The average speed of a body traveling on a road is 6.5 km/h.

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The electron binding energy for gold essence is. find the longest wavelength( in) of light that could eject electrons from gold in a photoelectric effect trial.

Electron

The electron is a subatomic flyspeck( denoted by the symbol whose electric charge is negative one abecedarian charge. Electrons belong to the first generation of the lepton flyspeck family, and are generally allowed to be abecedarian patches because they've no given factors or substructure. The electron's mass is roughly 1/ 1836th that of the proton.

Quantum mechanical parcels of the electron include an natural angular instigation( spin) of a half- integer value, expressed in units of the reduced Planck constant, ħ. Being fermions, no two electrons can enthrall the same amount state, in agreement with the Pauli rejection principle. Like all abecedarian patches, electrons parade parcels of both patches and swells They can collide with other patches and can be diffracted like light. The surge parcels of electrons are easier to observe with trials than those of other patches like neutrons and protons because electrons have a lower mass and hence a longer de Broglie wavelength for a given energy.

Electrons play an essential part in multitudinous physical marvels, similar as electricity, captivation, chemistry and thermal conductivity, and they also share in gravitational, electromagnetic and weak relations. Since an electron has charge, it has a girding electric field, and if that electron is moving relative to an bystander, said bystander will observe it to induce a glamorous field.

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A force of 20 N is applied to increase the horizontal spring by 5 cm: 4N/cm.

This is explained :Given a series spring: F = 20 N x = 0,5m

Using Hooke's Law: F = good x well=Fx=20/zero.

In physics, force is a force that can change the motion of an object. A force can cause an object with mass to speed up or accelerate. Pressure can also be defined intuitively as pushing or pulling.

Force is a vector quantity because it has both a value and a path. In technical know-how, the word "strength" has a special meaning. At this level, it is quite appropriate to describe pressure as pushing or pulling. Pressure does not always consist of or "have" objects. Pressure is applied to one element by one another. The concept of force is not always limited to living or inanimate objects.

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Substances that move to the stronger parts of a magnetic field are termed paramagnetic substances; the atomic feature responsible for this property is presence of unpaired electrons in atoms.

A paramagnetic substance is the substance that possess unpaired electrons that are heavily attracted in a magnetic field.

A magnetic field is defined as the field that exists around a magnet that produces a field of force.

Examples of paramagnetic substance include the following:

These substances are known as paramagnetic substances because they possess a high number of unpaired electrons.

Other properties of a paramagnetic substance include the following:

Therefore, Substances that move to the stronger parts of a magnetic field are termed paramagnetic substances; the atomic feature responsible for this property is presence of unpaired electrons in atoms.

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The person's average power when he uses an energy equivalent to 50 bbl of crude oil in one year is 3.49×10⁴ kW.

Average power can be defined as the total work performed to the total time it takes to perform the work.

To calculate the average power consumption of the person, we use the formula below.

Formula:

P = E/t............ Equation 1

Where:

From the question,Given:

E = 50×6.12×10⁹ J = 3.06×10¹¹ J

t = 1 year = (365×24) days = 8760 seconds

P = 3.06×10¹¹/8760

P = 3.49×10⁴ kW

Hence, the average power is 3.49×10⁴ kW.

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The oil filter for our car to be tightened with a torque of 30 n⋅m. we are using a 15-cm-long oil filter wrench, and we apply a force at the very end of the wrench in the direction that produces maximum torque is 200N.

A force is an effect that can alter an object's motion according to the physics. A force can cause object with mass to accelerate when it changes its velocity, for as when it moves away from rest. An obvious way to describe the force is as a push or a pull. A force is a vector quantity since it has both the magnitude and direction. It is calculated using newton SI unit (N). Force is denoted by the letter F. (formerly P).

The net force acting on an object is equal to rate at which its momentum varies over time, according to Newton's second law in its original formulation. This law suggests that object's acceleration is directly proportional to the net force acting on it, is in the direction of the net force, and is inversely proportional to the mass of the object if the object's mass is constant.

Thrust, which increases an object's velocity; drag, which decreases an object's velocity; and torque, which causes the changes in an object's rotational speed, are all concepts connected to force. Each part of an extended body often exerts the stresses on the sections that are nearby; the distribution of these forces throughout the body is what is known as the internal mechanical stress. Due to the balance of forces, such internal mechanical stresses do not generate acceleration of that body. Pressure is a straightforward form of the stress that, if unbalanced, can cause the body to accelerate. Pressure is distribution of several small forces applied over an area of a body. Stress typically results in flow of fluids or the deformation of solid materials.

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The nebular hypothesis describes that when a cloud collapses into a star system a new star is forming inside this glowing cloud of gas.

The nebular theory proposes that a rotating cloud of material called a nebula, composed primarily of light components, flattened into a protoplanetary disc and developed into a solar system made up of a star and circling planets.

The Sun originated independently from a collapsing cloud of gas and dust, and as the planets passed by it later, they were gravitationally pulled in.

Individual stars and their planets develop from the revolving clouds' flattening into protostellar discs.

Most of the angular momentum is transmitted into the residual accretion disc through an unidentified mechanism that is thought to be related to the powerful magnetic fields associated with a newborn star.

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If a wave is longitudinal that means that it is travelling in the exact same direction, at the exact same angle as the medium in which it is propagating. You can think of it like a stretched out slinky. If you push the slinky forward a little and then pull it back to its original position, a wave travels in the direction of the slinky's coils. Sound waves are just like that but the medium is all the particles that constitute air.

The force motorcycle exert backward on the ground to produce its acceleration is 1251.25 N,  if the mass of the motorcycle with rider is 185 kg.

Acceleration = 3.25 m/s^2

Resisting force Fr = 650 n

mass of rider = 185 kg

To find the force exerted backwards [tex]F_{b}[/tex]

[tex]F_{b}[/tex] = Fr +Ma

[tex]F_{b}[/tex] = 650 + (184)(3.25)

[tex]F_{b}[/tex] = 1251.25 N

The force motorcycle exert backward on the ground to produce its acceleration is 1251.25 N.

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The correct answer is option D: index finger and thumb are flattened against the handle

All of the following are true of neutral hand position except the index finger and thumb are flattened against the handle.

When the wrist is straight or lightly bent then it is said to be in a neutral position.

Our neutral hand position refers to the palm of the hand being held in an open and relaxed position.

Similarly, the hand will be in a neutral position if the fingers apply light pressure against the instrument handle.

Another example is if we hold a glass full of water, then we will see that our thumb and forearm are aligned with respect to each other.

In the above-mentioned case, the hand will be in a neutral position.

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The spring constant of Hooke's Law is 2160 MN/m.

We need to know about Hooke's Law to solve this problem. Hooke's Law describes the force applied to spring (elastic materials) will proportional to spring constant and displacement under the elastic condition. It can be described as

F = k . x

where F is force, k is spring constant and x is displacement.

The potential energy of spring can be determined as

PE = 1/2 . k . x²

where PE is potential energy

From the question above, we know that

PE = 70 J

x = 0.18 mm = 0.00018 m

By substituting the given parameters, we can calculate the total paralel spring constant

PE = 1/2 . k . x²

70 = 1/2 . kp . 0.00018²

kp = 4320987654 N/m

Find each spring constant

kp = k + k

4320987654 = 2k

k = 2160 MN/m

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Answer:

1.solid

2.gas

3.liquid

4.liquid and gas

5.gas

6.liquid

7.gas

8.liquid and gas

Explanation:

equating the formula for the bullet and riffle

Answer:

A. 0s to 1s

Explanation:

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