a skier has just begun descending a 20 degrees slope. assuming that the coeffecient of the friction 0.10 calculate
acceleration of the skier
the final velocity of the skier after 8.0 s

According to the given statement the heat absorbed is 43676.78 J .

The water's specific heat and the formula Q= mcΔT are used to compute the amount of heat absorbed. At 100°C, water vaporizes into steam. Calculating the amount of heat absorbed requires multiplying the number of moles of water by the molar heat of vaporization.

Mass, m = 227.1grams

To find how much heat is absorbed when 227.1 grams of steam is heated from  115.6°C to 12.2°C.

Heat absorbed is given by :

Q= mcΔT

c is specific heat of water

Put all the values, we get :

Q = 227.1 * 1.86 * (115.6 - 12.2)

Q = 43676.78 J

43676.78 J heat is absorbed.

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The current flow through a 60W bulb if the voltage across is 230V is 0.26 A.

P = V I

P = Power

V = Voltage

I = Current

P = 60 W

V = 230 V

I = P / V

I = 60 / 230

I = 0.26 A

Ohm's law states that if the temperature across a conductor remains the constant, the ratio of potential difference across the conductor to the current flowing in the conductor will also be constant.

Therefore, the current flow through a 60W bulb if the voltage across is 230V is 0.26 A.

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The graph that shows the relationship between the speed and the kinetic energy is option B.

Recall that the kinetic energy is referred to as the speed that a body possess by virtue of its motion. Thus an object that is in motion is said to posses the kinetic energy.  The kinetic energy is the energy of an object that has a velocity

The kinetic energy is linearly related to the speed of the object. This implies that the speed is directly proportional to the kinetic energy of the object. If there is a direct relationship, it the follows that the graph of the speed against the kinetic energy of the object ought to be a straight line graph.

As such, the relationship between the kinetic energy and the speed of the object can be seen from the image in option B.

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Answer:

F = 880 N

Explanation:

Apply Pascal's Principle.

f / a = F / A

Because the pressure (P = F/A) is equal on both sides of the piston.

So, using the International System of Units:

f / a = F / A

88 / 0.05 = F / 0.50

F = (88/0.05) * 0.50

F = 880 N

The weight of the rider will remain the same that is 65 kg after the ride is finished because the weight does not depend on speed.

It gauges how much gravity is pulling on a body.

Weight being a force, the SI unit of weight is the Newton, which is also the same as the SI unit of force (N). When we look at how weight is expressed, we can see that it depends on both mass and the acceleration caused by gravity; while the mass may not change from one location to another, the acceleration caused by gravity does.

According to the question, the weight will remain same because weight depends on mass and gravity but not the speed. As per the definition of weight it is the product of mass and gravity, it means for different plants the weight will be different but for the same planet the weight will be the same everywhere.

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Based on the given figure, you have that the components of the forces on the direction of the incline are:

applied force:

Fa = 500N*cos(-30°) = 433.01N

friction force:

Fr = µk*N = µk*m*g*cos(30°) = (0.42)(40kg)(9.8 m/s^2)cos(30°) = 142.58N

gravitational force:

Fg = m*g*sin(30°) = (40kg)(9.8)sin(30°) = 196.0N

Next, consider that the work done by a force is equal to the product of the force and the distance at which the force is applied. In this case, such distance is 8m.

Then, you have:

Work done by the applied force:

WFa = (433.01N)(8.0m) = 3464.08 J

Work done by the friction force:

WFr = (142.58N)(8.0m) = 1140.64 J

Work done by the gravitational force:

WFg = (196.0N)(8.0m) = 1568.0 J

Finally, the net work, based on the direction of the forces, is:

Net work = WFa - WFr - WFg = 3464.08J - 1140.64J - 1568.0J = 755.44J

Hence, the net work is 755.44 J

Answer: Wfr = -1883.25 J

Explanation:

1) In the x direction (direction of motion of the crate):

Fcos(30^o) - f_fr - mgsin(30^o ) = 0 (because a_x = 0)

f_fr = Fcos(30^o ) - mgsin(30^o)

f_fr = (498)(√3/2) - (40)(9.81) (1/2) = 235.28 N

⇒ W_fr = f_fr.s.cos(180^o) = -(235.28)(8.0) = -1882.25 J (1)

2) In the y direction (perpendicular to the motion of the crate):

n - Fsin(30^o) - mgcos(30^o) = 0 (because a_y = 0)

⇒ n = Fsin(30^o) + mgcos(30^o) = (498)(1/2) + (40)(9.81)(√3/2) = 588.83 N

⇒ f_fr = μ_k.n = (0.40)(588.83) = 235.53 N

⇒ W_fr = f_fr.s.cos(180^o ) = -(235.53)(8.0) = -1884.24 J (2)

Average of calculations (1) & (2): W_fr = -1883.25 J

The linear velocity of a point p(5,1,3) on the body relative to a point Q(3,4,2) on the axis of rotation​ is 17.13 m/s.

Linear velocity is defined as the rate of change of displacement with respect to time when the object moves along a straight path.

The relationship between linear velocity and angular velocity is given as;

v = ωr

where;

The magnitude of the radius is calculated as follows;

r = √[(5-3)² + (1-4)² + (3-2)²]

r = 3.74 m

The magnitude of the angular speed is calculated as;

ω = √[(-4)² + (1)² + (-2)²]

ω = 4.58 rad/s

The linear speed of the object is calculated as follows;

v = ωr

v = (4.58 rad/s) x (3.74 m)

v = 17.13 m/s

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The components of a 15 meters per second velocity at an angle of 60 above the horizontal are 13.05 m / s and 0.435 m / s

Resolving the velocity into its horizontal and vertical components, it makes a right angled triangle.

Hypotenuse = V = 15 m / s

θ = 60°

Opposite side = components = [tex]V_{y}[/tex]

Adjacent side = Horizontal component = [tex]V_{x}[/tex]

In a right angled triangle,

sin θ = Opposite side / Hypotenuse

cos θ = Adjacent side / Hypotenuse

sin 60° = [tex]V_{y}[/tex] / V

[tex]V_{y}[/tex] = 15 * 0.87

[tex]V_{y}[/tex] = 13.05 m / s

cos 60° = [tex]V_{x}[/tex] / V

[tex]V_{x}[/tex] = 0.5 * 0.87

[tex]V_{x}[/tex] = 0.435 m / s

Therefore,

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a.)  the ball rises to a height of 31.88m

b.) It takes the ball 2.55 seconds to reach its highest point

c.) It takes the ball 2.55 seconds to hit the ground

d.) The ball's velocity is -24.99 m/s in the negative direction which is downwards.

Velocity is the directional speed of a object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time.

From the given question, we have that

b.) At highest point velocity of the ball will become zero so v=0m/s.

So using equation

v = u + gt

0 = 25 - 9.8t

t = 25/9.8 s =2.551 s

Time taken by the ball to reach its highest point will be 2.551 seconds .

a.)  The height the ball rises is given by

v²-u²=2gh

=> 0-(25.0)²=-2*9.8*h

=> 19.6h= (25.0)²

=> h= 31.88m.

c.)  It will take the ball 2.55 seconds to hit the ground

after it reaches its highest point because it will take the ball same time for the ball to reach its highest point or fall to the ground.

d.) velocity = u - gt

V = 0 - 9.8 * 2.55

V= -24.99 m/s in the negative direction which is downwards.

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The direction of the third force, such that the object continues to

move with a constant velocity is  94.5N at 0.19° south of east.

The force that one thing exerts on another. A barrel being pushed by a human is an illustration of applied force. When the individual pushes the barrel, the barrel experiences an applied force. Newton's second law of motion defines the force formula as follows: A force is equal to an object's mass times its acceleration, or F = m a. You must use SI units when applying this formula: kilograms for mass, meters per second squared for acceleration, and newtons for force. a push or pull that an object has experienced. Here, an object is given a force by a person or any other thing. A chair being pushed to the opposite side of the room, for instance.

For the object to move with constant velocity the total acceleration must be zero.

So,

Total  F = [tex]F_{1} +F_{2} +F_{3}[/tex]

  ma = 0

[tex]F_{1}[/tex] = 84.4N

[tex]F_{2}[/tex] = 42.7 N

[tex]F_{3} = -F_{1} - F_{2}[/tex]

= 94.58 N

TanФ = 0.19°

Hence [tex]F_{3}[/tex] = 94.5N at 0.19° south of east.

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The braking distance of the driver of a 1200 kg car traveling at an initial speed of 10m/s is 7.5 m

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

Force = mass × acceleration

-8000 = 1200 × a

Divide both sides by 1200

a = -8000 / 1200

a = -6.67 m/s²

Finally, we shall determine the distance. Details below

v² = u² + 2as

0² = 10² + (2 × -6.67 × s)

0 = 100 - 13.34s

Collect like terms

0 - 100 = -13.34s

-100 = -13.34s

Divide both side by -13.34

s = -100 / -13.34

s = 7.5 m

From the above calculation, we conclude that the breaking distance is 7.5 m

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The formula for determining the gravitational potential energy of the balloon is expressed as

Energy = mgh

where

m is the mass of the ballon

g is the accelaration due to gravity and the value is 9.8m/s^2

h is the height of the balloon above the ground

From the information given,

m = 371

h = 615

Thus,

= 371 x 89.8 x615 = 22316017 NKJoulesJoules8298.651

The conservation of momentum states that the total intiial momentum is equal to the total final momentum. In this cae this will mean that:

The acceleration of free fall of each object will be the same.

An assumption made is that both objects must be on Earth.

The acceleration of free fall of every object is the acceleration experienced by the freely falling object as a result of  the effect of gravitation of earth alone.

Mathematically, the formula for acceleration of free fall of every object on earth is given as;

g = GM/R²

where;

The value of acceleration due to gravity on Earth is 9.8 m/s².

Since both objects are dropped from same height on Earth, they will experience equal  acceleration of free fall.

The assumptions made are;

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The distance to drive East is 1.7 km and the distance you would have to drive North is 4.7 km

The North-East, East and North travel distances from a right angled triangle. So trigonometric ratios are applicable.

sin θ = East distance / NE distance

sin 20° = East distance / 5

East distance = 1.7 km

cos θ = North distance / NE distance

cos 20° = North distance / 5

North distance = 4.7 km

Some of the basic trigonometric ratios are:

Therefore, the distance to drive East is 1.7 km and the distance to drive North is 4.7 km

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When two surface attach each other a force is produced called friction. It's SI unit is newton

The net force acting on the box is 5N , and it is unbalanced.

since the forces acting on the system is 7N and 2N which is opposite direction.

here given two forces ,

        f1 = 7N

        f2 = 2N

since both forces are in opposite direction ,

     Net force = f1 - f2

                      = 7N - 2N

                      = 5N

so the net force that act on the given box is 5N and unbalanced .

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Answer:

That is human_scale thinking and understanding

Explanation..

If you are going to consider stars(sun's), then you have to thik on a more cosmological scale stars are prodigiously immense which means they can burn 4 million tons of their fuel per second and not even realize it.

Consider this_if the life of our sun is of the order of 8 billion years, then it takes two billion years to bum only a quit of its fuel.

The universe is a very large place and if you are going to understand it, you have to think large.

When the light falls on a soap bubble spread on a water puddle, and a spectrum of color is observed due to constructive and destructive of light waves which means option (3) is correct. Light waves interfere into each other to produce a spectrum which consists of bright and dark fringes.

Take into accouint that the regions that suffer deforestation tend to generate soil erosion to eventually become non-productive land.

Then, from the given choices you have that deforestation impacts in the following way:

The elimination of a protective covering causes the sun to dry out the ground.

In astronomy, luminosity is the power (amount of energy per unit of time) emitted in all directions by a celestial body. It is directly related to the absolute magnitude of the star. The luminosity of the Sun, L☉ is the classical unit used in astronomy to compare the luminosity of other stars. Its approximate value is:

From the options, the correct one is:

A. Sun

The development of complex societies depends of the Northwest Coast tribes on;

The term society just has to do with people that are found to live around a give geographical area. This is the way the people tend to live along with the civilization that they may tend to have actually created over a long period of time as we can see.

Having said thus, the people of the are the people that there originally found around the west of which the original native Americans also formed a huge part of. These were the people that tend to be found around the Americas before the onset of modern civilization as we can se.

The factors that  helped Northwest Coast tribes develop complex societies are found in the section above. These factors saw to the development of the region.

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Answer:

V₁ = 48 m/s

Explanation:

Using the Conservative Law of Momentum:

∑Qₓ = 0

Q₁ + Q₂ = 0

Q₁ = Q₂  (In absolute values)

Where:

Q₁: right before the impact

Q₂: right after the impact

So:

Q₁ = Q₂

m₁*V₁ + m₂*V₂ = m₁*V + m₂*V  (Because both ball and man moves together)

5 * V₁ + 75 * 0 = (5 + 75)*3

5V₁ = 80 * 3

V₁ = 240/5

V₁ = 48 m/s

The particles speed at B is 12 m/s .

Potential energy is the energy that is held in reserve in any system or object as a result of how its components are positioned or assembled. The external environment, such as air or height, is not a factor in this, though. The energy that an object or a system's particles have while in motion, however, is known as kinetic energy. An item or particle's motion gives it kinetic energy, which it might use to move. An item accelerates and gains kinetic energy when work, which transfers energy, is done on it by exerting a net force. Potential energy is a form of stored energy that is dependent on the arrangement of a system's components. In a compressed state, a spring has higher potential energy.

The mass of the particle = 500g

= 0.5 kg

The energy of the particle when it is released

E = 5g

The potential energy at B

= 2 J

Loss in potential energy = gain in kinetic energy.

K.E.= 1/2 × m × v²

Here after putting values we get

speed at B = 12m/s.

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This is an example of F = ma because the net force applied is directly proportional to the weight (mass) of the basket.

Newton's Second Law of Motion states that the acceleration of an object is inversely proportional to its mass and directly proportional to the net force acting on the physical object.

Mathematically, Newton's Second Law of Motion is given by this expression;

F = ma

Where:

In conclusion, the above scenario is an example of the demonstration of Newton's Second Law of Motion.

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The answer is true, that the hydraulic press utilizes Bernoulli's principle.

It can be derived from the Principle of conservation of energy.

According to Bernoulli's principle, which governs fluid dynamics, a fluid's speed increases concurrently with a reduction in pressure or potential energy. The mathematical concept is named after Swiss mathematician Daniel Bernoulli, who first published it in his book Hydrodynamics in 1738.

The venturi tube is a real-world example of Bernoulli's Principle in action. The venturi tube has an air intake that constricts to a throat and an exit segment that widens as it moves backward. The entrance and outflow both have the same diameter.

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The y-component of the constant net force applied to the car to bring it to a stop is mathematically given as

F_y =666.38N

This is further explained below.

Generally, In the field of physics, an influence that may alter the motion of an object is referred to as a force.

An object having mass may experience a change in its velocity, often known as acceleration, when subjected to a force.

Intuitively, force may also be conceptualized as either a push or a pull. Because it may be measured in both magnitude and direction, a force is considered a vector quantity.

When considering coplanar force of a point or a body we tend to consider the x components and the y components of force as they come together to give the Net Force or the resultant for and directions of force.

But for this case we shall strictly consider the y company of force as it pertains to this body and its force independent of the x components force as regards to Resultant force

In conclusion,

v^2 =2 a s

[tex]a &=\frac{v^2}{25}=\frac{(18.4)^2}{2 \times 268} \\\\[/tex]

a =0.631ms^2

F_y =m a

F_y=1055* 0.631

F_y =666.38N

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The distance in Km he has fallen to break the sound barrier is 6 Km

To obtain the answer to the question, we'll beging by calculating the time taken to break the sound barrier. This can be obtained as follow:

v = u + gt

343 = 0 + (9.8 × t)

343 = 0 + 9.8t

343 = 9.8t

Divide both sides by 9.8

t = 343 / 9.8

t = 35 s

Finally, we can obtain the height as follow:

h = ½gt²

h = ½ × 9.8 × 35²

h = 4.9 × 1225

h = 6002.5

Divide by 1000 to express in Km

h = 6002.5 / 1000

h = 6 Km

Thus, Félix baumgartner broke the sound barrier when he had fallen 6 Km

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First, let's calculate the forces in the 3 kg mass:

Then, the forces in the 2 kg mass:

From the first equation, let's solve it for T:

Using this value of T in the second equation, we have:

Finally, using the given values (with g = 10 m/s²), we have:

If the acceleration is 2 m/s², after 2 seconds the speed is:

Therefore the correct option is the second one.