5. A cycle accelerates from rest at a constant acceleration of 0.4m/s/s for 20 seconds then
stops pedalling and slowed to standstill at constant deceleration over distance of 260m.
Calculate:
a. Distance travelled by cyclist in the first 20seconds
b. The speed of the cyclist at end of this time

Answer:

acceleration= velocity/time

60km/hr = 60 km /60 mins = 1km/min so accn = 1km/5= 1000m/5 = 200m/m

v²= u²+2as

(1000)² = 0²+ 2 x 200 x s

(1000)²/400= s

2500m

Answer:

Duration

Explanation:

Because duration is not a factor, but it's the outcome or effect or observation from the reaction used to give the rate of reaction

Complete Question

The complete question is shown on the first uploaded image

Answer:

The value of  [tex]X = 1000 \ N[/tex] and  [tex]Y = 1400 \ N[/tex]  

Explanation:

Considering the diagram,

   Taking moment about the pivot , we have

           [tex]X * 1 = 400 * 2.5[/tex]

=>         [tex]X = 1000 \ N[/tex]

Generally given that the bar is at equilibrium then the upward forces is equal to the down ward force

So

        [tex]Y = X + 400[/tex]

=>     [tex]Y = 1000 + 400[/tex]

=>     [tex]Y = 1400 \ N[/tex]    

Yes, the pH of the solution will change. For an acid, it will increase and for a base, it will decrease

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

Mathematically, it expressed as

pH = –Log [H⁺]

The molarity of Hydrogen ion [H⁺] is given by

Molarity of [H⁺]= mole of [H⁺] /  Volume

From the formula, we can see that the molarity is inversely proportional to the volume.

Thus an increase in the volume will decrease the molarity of [H⁺]. This also will affect the pH.

However, it should be noted that as the pH increases, pOH decreases and as pH decreases, pOH increases.

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Hello!

[tex]\large\boxed{KE = 360 J}[/tex]

Use the equation KE = 1/2mv² to solve for the kinetic energy of the man.

We are given the mass and velocity, so plug these values into the equation:

KE = 1/2(80)(3²)

KE = 1/2(720)

KE = 360 J

Answer:  32

The average velocity of the rock would be 32 ft per second.

The rock will be 15ft above the ground 0.25 and 2.5secs after

The height of the rock above the ground is expressed according to the expression [tex]s(t)=-16t^2+44t+5[/tex]

In order to get the time the rock will be 15ft above the ground, we will substitute s(t) = 15 ft into the formula above;

[tex]15= -16t^2+44t+5\\-16t^2+44t = 15 -5\\-16t^2+44t = 10\\-16t^2+44t- 10 = 0\\16t^2-44t+10=0[/tex]

Factorize the expression to get the value of "t"

2(4t−1)(2t−5) = 0

4t - 1 = 0

4t = 1

t = 0.25secs

Similarly 2t - 5 =0

2t = 5

t = 5/2 = 2.5secs

This shows that the rock will be 15ft above the ground 0.25 and 2.5secs after

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Explanation:

soln:

given,

dimensions(l,b,h)=5mx4mx6m

mass(m)=10 kg

density(d)=?

we know,

d=m/v

or,d=10/5*4*6

•°•d=1/12kg/m^3

Answer:

25,000,000 Km ;)

Explanation:

Answer:

melting

Explanation:

Answer:

melting

Explanation:

Melting, change of a solid into a liquid when heat is applied.

Answer: B) A machine that is 100% efficient

Explanation:

The second law of thermodynamics states that a machine will always be less than 100% efficient as heat is never converted completely into mechanical energy.  Even an ideal, frictionless engine can't convert anywhere near 100% of its input heat into work.

Second law of thermodynamics states that any natural system tends to disorder. That is, the total entropy of the universe will tend to increase over time.  Heat will alwyas from a hotter body to a colder body.

The mass of the bowling ball is more hence the acceleration would be less for the bowling ball so, option 2 is correct.

In mechanics, a force is any action that has the potential to change, maintain, or deform a body's motion. The three principles of motion outlined by Isaac Newton in his Principia Mathematica are frequently used to illustrate the concept of force (1687).

Newton's first law states that a body at rest or moving uniformly in a straight line will stay in that state until a force is applied to it. According to the second law, a body will accelerate (change in velocity) in the direction of any external force acting on it.

The mass of the bowling ball is more hence the vertical force is more on the bowling ball thus, it will travel less in the horizontal direction.

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Firstly its axis of rotation is inclined at 177.36 degrees (compared to 23.5 degrees on Earth). This means that Venus rotates in a retrograde direction from east to west, making the Sun rise in the west and set in the east. Further to this the rotation is very slow: a sidereal day on Venus lasts 243 Earth days.

ushi wygunu geygo sieta?

Answer:

When two substances are mixed together, a color change is observed. This observation is not enough evidence that there is a chemical reaction happening because color changes are not indicators of chemical reaction:

Answer:

thrust

Explanation:

Answer:

thrust

Explanation:

Answer:

10m/s (if the velocity is constant!!)

Explanation:

v=Δx/Δt=100/10=10m/s (if the velocity is constant!!) (i dont know if the letters are right in english sorry)

Answer:

Q1. a

Q2. a

Explanation:

mass is not a vector quantity and west i 90 degrees more than south

Explanation:

Answer:

1 kg at 1 m/s

Explanation:

less weight to propell it forward

Answer:

The correct option is (c).

Explanation:

When an object tied to a rope and we rotate it, the centripetal force acting on it. This force acts towards the center of the circle. The magnitude of the force is given by :

[tex]F=\dfrac{mv^2}{r}[/tex]

Where,

m is mass, v is speed and r is radius of path

If the length of the rope is increased, it means it will make a large circle i.e. large radius.

As we can see that force is inversely proportional to the radius of circle. It means less force is required because the force is inversely proportional to the radius of the circular orbit. Hence, the correct option is (c).

To move an object at a constant speed after increasing the length of the rope, less force is required because the force is inversely proportional to the radius of the circular orbit. Thus option C is correct.

The force applied to the object moving in a circular motion can be given by:

[tex]\rm Force\;=\;\dfrac{mass\;\times\;(speed)^2}{radius}[/tex]

From the equation, it is evident that force has been inversely proportional to the radius of the circular path. Since the length of the rope is doubled, the radius the circular path has also been doubled.

If we apply the same unit of force, the speed of the motion will increase, as speed has been directly proportional to the force applied.

Thus, to maintain the object at a constant speed, the force applied to the object has been reduced.

So, in order to move an object at a constant speed after increasing the length of the rope, less force is required because the force is inversely proportional to the radius of the circular orbit. Thus option C is correct.

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Answer:

I'm christian

Explanation:

Answer:

This question is hard I will edit my answer when I find the answer

Explanation:

Answer:

Speed and direction of motion is velocity. ... A change in speed is a change in velocity – so, a change in speed is an example of acceleration!

Measure

Remember that velocity includes the speed and direction of an object. Therefore, a change in velocity can be either a change in how fast something is moving or a change in the direction it is moving.

The speed and direction of an object in motion is called velocity

Speed is defined the distance traveled with time. Mathematically, it is expressed as:

Speed = distance / time

Direction of an object is simply the path of motion of an object.

Velocity of an object is defined as the displacement traveled with time i.e

Velocity = displacement / time

Displacement of an object is the distance in a specific direction.

Thus, we can say that the velocity of an object is the speed in a specific direction.

With the above information in mind, we can conclude that the speed and direction is called velocity.

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Answer:

Its B.

Explanation:

I don't really know how to explain it but thats the answer.

Answer:

43-Z

Explanation:

Answer:

9.8m\sec

Explanation:

free falling neglecting the air drag so its acceleration will be the acceleration due to gravity

Answer:

The distance between the object and the mirror is X/2

Explanation:

If we look into a plane mirror, we see the image of our face situated behind the mirror. Now, if we move backwards, the image also moves backwards in the mirror so that it is always at the same distance behind the mirror as our face is in front of the mirror. Thus, the image I in a plane mirror is as far behind the mirror as the object O is in front of it. In other words, the distance of the image from the plane mirror is equal to the distance of the object from the plane mirror. We will prove this fact by using the laws of reflection and simple geometry.

From the second law of reflection, we have:Angle of incidence = Angle of reflection

So, NAO =  NAX       (angle i = angle r)

It is clear that the triangles MIA and MOA are congruent triangles and, therefore, their corresponding sides should be equal. Thus :

IM = OM

MA is a common side to both triangles  

Now, OM represents the distance of object from the mirror, and  IM represents the distance of image from the mirror .  

So, we can now say that:

Distance of image from mirror = Distance of object from mirror

The 24 N force applies an acceleration a₁ such that

24 N = (8.0 kg) a₁

a₁ = (24 N) / (8.0 kg)

a₁ = 3.0 m/s²

Starting from rest, the object accelerates at this rate for 10 s, so that it reaches a velocity v of

v = (3.0 m/s²) (10 s)

v = 30 m/s

and in these 10 s, the object travels a distance d₁ of

d₁ = 1/2 (3.0 m/s²) (10 s)²

d₁ = 150 m

When it hits the rough surface, it slows to a stop in 10 s, so that its accleration a₂ during this time is such that

0 = 30 m/s + a₂ (10 s)

a₂ = - (30 m/s) / (10 s)

a₂ = -3.0 m/s²

so that it covers an additional distance d₂ such that

d₂ = 1/2 (-3.0 m/s²) (10 s)²

d₂ = 150 m

So the object travels a total distance of d₁ + d₂ = 300 m.

Alternatively, once we find the accelerations during both 10 s intervals and the velocity after the first 10 s, we get

(30 m/s)² - 0² = 2 (3.0 m/s²) d₁

d₁ = (30 m/s)² / (6.0 m/s²)

d₁ = 150 m

and

0²- (30 m/s)² = 2 (-3.0 m/s²) d₂

d₂ = (30 m/s)² / (6.0 m/s²)

d₂ = 150 m

so that, again, d₁ + d₂ = 300 m.

Answer:

300 m

Explanation:  

We can find the acceleration of the object by using Newton's 2nd Law: F = ma.

Divide both sides by 8.

We can find the final velocity (v) using the acceleration since a = v/t.

Multiply 10 to both sides.

List out the variables we have for the object during its first 10 seconds in motion.

We want to solve for the displacement in the x-direction during the first 10 seconds, so we can use this constant acceleration kinematics equation:

Plug in known values into the equation.

Remove units to make it easier to read.

0 * 10 cancels out, and we are left with:

Simplify this equation.

The displacement in the x-direction is 150 m during the first 10 seconds of the object's motion.

Now we want to solve for the acceleration during the last 10 seconds while the object is slowing down and stopping.

Since the object stops, the final velocity is 0 m/s. We know the final velocity of the first 10 seconds is the initial velocity of the last 10 seconds.

Let's use this constant acceleration equation to solve for a:

Plug in known variables:

Subtract 30 from both sides of the equation.

Divide both sides of the equation by 10.

List out known variables for the last 10 seconds of the object in motion:

Let's use the same equation we used for the first 10 seconds since we have the same known variables:

Plug in known values:

Remove units to make the equation easier to read.

Simplify this equation.

The displacement in the x-direction for the last 10 seconds is equal to the displacement for the first 10 seconds.

Let's add these together:

The total distance the object covered is 300 meters.

Answer:

salt w nulas...........