A hockey puck with a mass of 160 g is sliding across an empty ice rink. The coefficient of friction between the hockey puck and the ice is 0. 51. The puck travels 47. 7 m before coasting to a stop. What was the initial velocity of the puck?.

List of things that could affect your body weight:

Answer:

mass and gravity

Explanation:

From a PHYSICS standpoint:

mass   and gravity   determine the weight of a body

The sum of the three forces are .

Given:- There are three forces: force one is pointing in the direction  north east, force points  north of west, and force three points directly north.

To Find:- We have to find the sum of the three forces.

By using the concept of the force it will be solved.

According to the problem,

The sum of the three forces are .

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From the calculation,  the gravitational field at the pendulum’s location is 9.8 m/s^2

A pendulum is a device that is used to demonstrate oscillatory motion. We have the following information.

l =  36.9 cm or 0.369 m

T = 1.22 s

Then;

T = 2π√l/g

T/2π = √l/g

(T/2π)^2 = l/g

g(T/2π)^2 = l

g = l/(T/2π)^2

g = 0.369/(1.22/2 *3.14)^2

g = 9.8 m/s^2

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Answer:

Inductor should be placed the circuit to raise its power factor.

Explanation:

Inductor:

Capacitor:

we know that,

Power factor:

cosα = R / Z

cosα = R^2/ (sqrt(R

[tex]cos\alpha =\frac{R}\sqrt{R^{2}(X_{c}-X_{L})^{2} }[/tex]

To increase the power factor, denominator should decrease.

from the equation we can say that, the power factor is inversely proportional to X(L)

Hence X(L) should increase.

Therefore, an inductor is required to be connected.

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The density of the mercury in lbs/l is 29.96 lbs/l.

Density: The ratio of the mass of the substance to its total volume is defined as the density of that substance.

The formula of the density is,

d=m/V

where d is the density, m is the mass and V is the volume.

Conversion of the unit from g/ml to lbs/l:

It is given that the density of the given substance is 13.6 g/ml.

1 lb = 0.454 Kg

1 kg = 1000 g

So 1 lb = 0.454 *1000 g

1 lb = 454 g

That means 1 g = 1/454 lb

Then 1 ml = 0.001 l.

Using these values, the density of the given substance in lbs/l is calculated.

13.6 g/ml = (13.6 g/ml)*(1 lb/ 454 g)÷(0.001 l/ml)

13.6 g/ml = 29.96 lbs/l

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A. The momentum of the boat, given the data is 3240 Kg.m/s

B. The new velocity of the boat is 11.93 m/s

Momentum is defined as the product of mass and velocity. It is expressed as

Momentum = mass × velocity

This is defined as the change in momentum of an object.

Impulse = change in momentum

Impulse = final moment – Initial momentum

Imulpse = m(v - u)

Momentum = mass × velocity

Momentum = 540 × 6

Momentum = 3240 Kg.m/s

Imulpse = m(v - u)

3200 = 540 × (v - 6)

Divide both sides by 540

v - 6 = 3200 / 540

v - 6 = 5.93

Collect like terms

v = 5.93 + 6

v = 11.93 m/s

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The banking angle of the curved part of the speedway is determined as 32⁰.

The banking angle of the curved part of the speedway is calculated as follows;

V(max) = √(rg tanθ)

where;

V² = rg tanθ

tanθ = V²/rg

tanθ = (34²)/(190 x 9.8)

tanθ = 0.62

θ = arc tan(0.62)

θ = 31.8

θ ≈ 32⁰

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Diode is probably fault.

Diode is an electrical component which allows current to flow in one direction and heavy resistance in other direction.

           The working of diode is based on the p-n junction which have

           more electron and less hole if p-n junction is n-type and vice-versa.

There are various uses of diode in electric appliances.

 If the diode possess high resistances in both the directions then there is

 no flow of current. So, the diode must be fault .

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Stars that have ejected a planetary nebula go on to become white

 dwarfs.

As we know planetary nebula is a type of glowing shell of ionized gases and there are various stages for the formation of stars. Stars are formed when dispersed matter in gaseous form starts coalescing together under the force of gravity into a compact object. Gravity continuously tries to shrink the object and during this process, the density and temperature inside the star rises.

The fate of the star depends critically on its mass. For stars with mass less than 1.4 solar masses of sun collapse into an extremely dense compact object called "white dwarf". Electron degeneracy pressure is responsible for counterbalancing the inward gravitational force in "white dwarf".

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The radius of the electron's path is once it enters the magnetic field 3.16*10^-4 m.

The electric capacity difference, additionally called voltage, is the outside work needed to bring a rate from one region to some other area in an electric discipline. The electric powered capacity distinction is the change of potential electricity skilled by way of a test rate that has a fee of +1.

The distinction in ability among two points represents the paintings worried or the electricity released in the switch of a unit amount of power from one factor to the other.

Electric ability is the work executed in step with unit fee in bringing the fee from infinity to that factor against electrostatic pressure. In a conductor, electrons float simplest when there is a difference in electric stress at its ends. This is additionally known as the capacity distinction.

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Answer:

46.656km

Explanation:

it covers 46.656 km

An athlete runs with a velocity of 11 km/hr for 5 minutes then the next 4 minutes at a speed of 16 km/hr and the next 6 minutes with a speed of 18 km/hr then the total distance traveled by the athlete is 3.78 km.

Velocity is the rate of change in direction of an item in motion as defined by a specific standard of time and observed from a specific frame of reference. Kinematics, the area of classical physics that studies how bodies move, uses the concept of velocity as a fundamental building block.

It takes combined magnitude and direction to define velocity, a physical vector quantity. Speed is a coherent-derived unit that expresses the scalar exact number (magnitude) of velocity. Its quantity is expressed in SI units of meters per second.

Firstly,

11 km/ hr for 5 minutes = 5/60 × 11 = 11/12

16 km/hr for 4 minutes = 4/60 × 16 = 16/15

18 km/hr for 6 minutes = 6/60 × 18 = 18/10

Net distance travelled = 11/12 + 16/15 + 18/10 = 3.78 km

Therefore, the net distance traveled by the athlete is 3.78 km.

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The speed of a pulse traveling along the cord, v = 19.8 m/s.

The tension, T on the cod is first obtained as follows:

T = 2.0 * 9.8 m/s²

T = 9.6 N

The mass per unit length, μ of the cord is then determined:

μ = 0.3/6

μ = 0.05 kg/m

The speed of the pulse, v = √(T/μ)

v = √(9.6/0.05)

v = 19.8 m/s

In conclusion, the speed of the pulse is the distance covered per unit time.

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The speed of the stone upon impact with the ground [tex]{V_f}={V_o} (\frac{w-f}{w+f})^{\frac{1}{2}}[/tex]

The initial speed = [tex]{V_o}[/tex]

Acceleration

Acceleration when ball is moving upward = (w + f)/m

[tex]$\mathrm{V}_{\mathrm{f}}^{2}-\mathrm{V}_{\mathrm{i}}^{2}=2 \overrightarrow{\mathrm{a}} \cdot \overrightarrow{\mathrm{s}}$[/tex]

[tex]$=0-\mathrm{V}_{0}^{2}=-2 \mathrm{~s}\left(\frac{\mathrm{w}+\mathrm{f}}{\mathrm{m}}\right)$[/tex]  ..... (i)

[tex]$\mathrm{s}=\frac{\mathrm{V}_{0}^{2}}{2\left[\frac{\mathrm{w}+\mathrm{f}}{\mathrm{m}}\right]}$[/tex]

While coming down

[tex]{V_i=0}[/tex]

[tex]$\mathrm{V}_{\mathrm{f}}^{2}-\mathrm{V}_{\mathrm{i}}^{2}=2 \overrightarrow{\mathrm{a}} \cdot \overrightarrow{\mathrm{s}} ; \mathrm{a}=(\mathrm{w}+\mathrm{f})$[/tex]

[tex]$\mathrm{V}_{\mathrm{f}}=\sqrt{\frac{2 \times(\mathrm{w}-\mathrm{f}) \mathrm{V}_{0}^{2}}{2(\mathrm{w}+\mathrm{f})}}$[/tex]

[tex]$\mathrm{V}_{\mathrm{f}}=\mathrm{V}_{\circ}\left(\frac{\mathrm{w}-\mathrm{f}}{\mathrm{w}+\mathrm{f}}\right)^{1 / 2}$[/tex]

The speed of the stone upon impact with the ground

[tex]$\mathrm{V}_{\mathrm{f}}=\mathrm{V}_{\circ}\left(\frac{\mathrm{w}-\mathrm{f}}{\mathrm{w}+\mathrm{f}}\right)^{1 / 2}$[/tex]

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Answer:

The force should be equal to 10000 N.

Explanation:

When the car turns round a circular path, it is assumed that there is some centripetal force acting towards the center.

The centripetal force is calculated by the formula,

F=mv^2/r

Given m=1000 kg, v=10 m/s and r=10 m.

F=1000*(10)^2/10

F=10000 N

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Answer:

Explanation:

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[tex]\\ \blue{MaggieEve}[/tex]

Answer:

scientific theory”?A. a best guess explanation. B. a rigorously tested explanation. C. an opinion of what should happen. D. a mathematical relationship

Answer:

CORNEA

Explanation:-

Cornea: Basically the transparent circular part of the front of the eyeball. It refracts the light entering the eye onto the lens, which then focuses it onto the retina. The cornea contains no blood vessels and is extremely sensitive to pain.
Hope it helps

Answer:

30cm^3

Explanation:

ml means milliliter, 1 ml= 1cm^3 that's the unit for volume

hence

Δv=185-155=30ml=30cm^3

Answer:

Nearer the top

Explanation:

Since the shape is not symmetrical in all axis, from the shape, there is more matter occupying the top half of the image. Hence the senter of gravity being at the top

Answer:

10 mph

Explanation:

55 - 45 = 10 mph

Answer:

A

Explanation:

According to law of conservation of momentum, the total momentual in the system will be conserved

Stone A moves away from Stone B at a velocity of 2 m/s, and the momentum is not conserved is the correct answer. The correct option is (b).

The momentum of Stone A is transferred to Stone B when Stone B strikes Stone A and stops. Stone A begins to move with a 2 m/s velocity in the opposite direction as a result (because Stone B was going with a 2 m/s velocity in the opposite direction).

The momentum is not conserved, though, because the momentum of Stone B prior to the impact (which was in the opposite direction) does not match the momentum of Stone A following the contact. The impact results in a little loss of momentum, perhaps as a result of friction or other dissipative forces.

Therefore, The correct option is (b). Stone A moves away from Stone B at a velocity of 2 m/s, and the momentum is not conserved.

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The final speed of the object is 11.2m/s.

To find the answer, we need to know about the Newton's equation of motion.

V= √126= 11.2 m/s

Thus, we can conclude that the final speed is 11.2 m/s.

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To determine the focal length of a convex lens, if we are using sun as distant object, then we get a value which is closer to the accurate value of convex lens.

To find the answer, we need to know more about the focal length of a convex lens.

Thus, we can conclude that, the if we are using sun as distant object, then we get a value which is closer to the accurate value of convex lens.

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If we use the sun as a distant object to calculate the convex lens's focal length, we obtain a number that is more closely related to the actual convex lens value.

We need to learn more about a convex lens's focal length in order to locate the solution.

We can therefore draw the conclusion that if we use the sun as a distant object, we will obtain a value that is closer to the convex lens's actual value.

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  The centre of mass of the system is the point at which the total

  mass of system could be concentrated without changing the moment

  of the system.

Centre of Mass is the point at which the whole mass of the system

is assumed to be concentrated.

 The general formula for the COM is:

              xₙ =  Σmₐxₐ / Σmₐ         where,  a = 1,2,3.........n

  Here the term Σ mₐ xₐ is called the first moment of the system and the

  denominator expression is called total mass of the system.

    Therefore, from this theory we can say that the moment of the system

    remain unchanged while calculating the COM.

  Hence, The centre of mass of the system is the point at which the total

  mass of system could be concentrated without changing the moment

  of the system.

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Answer: When two air masses collide at a front, one air mass may be pushed upward by the other. This is because one air mass is denser than the other.

Explanation: To know the correct answer, we need to know more about the Collision of Air masses.

Thus, from the above explanation, we can conclude that, one air mass may be pushed upward by the other, because one air mass is denser than the other when they came in contact with each other.

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Doppler shift method cannot be used to detect a planet like earth because the mass of Earth is very less.

What is Doppler's effect?

The Doppler effect is produced when an apparent upward shift in frequency of a moving source of waves is observed by the observer towards which the source is approaching also when an apparent downward shift in frequency of observed by the observer when the source is receding.

In astronomy Doppler effect is used by observing the shift in frequency of electromagnetic waves produced by moving stars in our galaxy and beyond. This takes place in the manner:

The Doppler shift method is useful for greater celestial masses. The mass of earth is very less in comparison, thus the Doppler shift method cannot be used to discover a planet like Earth.

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wind energy - wind is source

coal - coal is source

petroleum - Crude oil is source

natural gas - fossil energy is source

solar - sun is source

The classical description of energy is the ability of a system to perform work, but because energy exists in so many forms, it is hard to find one comprehensive definition

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Answer:

i think it is d

Explanation:

hope this helps!!!

Answer:

Read the information down below. Hope it helps :)

Explanation:

3) C. When gasoline burns in a car engine, some of the chemical energy in the gasoline is converted into heat, then the heat is converted into mechanical energy, and finally mechanical energy moves the car.

4) A. Chemical energy is energy released when a substance undergoes a chemical reaction.

5) D. Radiant energy includes visible light, x-rays, gamma rays, and radio waves.

6) 1. Chemical energy. A battery stores chemical energy and converts it to electrical energy.

   2. Potential energy is stored energy and the energy of position.

   3. Kinetic energy is the energy of motion.

   7. A battery is a device that stores chemical energy and converts it to    

      electrical energy.

   8. Potential energy is stored energy and the energy of position.

   9. Kinetic energy is the energy of motion.

The correct answer is 3).The correct option is C). 4) The correct option is A).

5). The correct option is D).  6). The correct option is A). 7) The correct option is A).

3). A moving car releases Kinetic and Potential energy both of which comes under the category of  Mechanical energy.

4). Explosions releases heat which is produced due to chemical reaction during explosion, Explosions' releases Chemical energy

5) X-ray are electromagnetic radiations, They are released when electron losses it's speed.

6) A battery in the phone can be considered as an example of Potential energy as charging occurs due to change in potential difference.

7) A battery in it's package is an example of potential energy.

The correct options are 3).B, 4).A, 5).D, 6).A 7)A.

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Answer:

The answer is B, 1 mile

Explanation:

60 (minutes) ÷ 3 (mph) = 20, which means every 20 minutes you are traveling 1 mile