A 50 kg ball rolls down the street at 5 m/s.
Calculate the momentum of the ball.

Answer:

Explanation:

Given

initial velocity u = 15m/s

Height below the water = 25m

a) Using the equation of motion S = (v+u)/2 * t

25 = 0+15/2 * t

25 = 7.5t

t = 25/7.5

t = 3.33s

Hence it will take 3.33secs to reach the water

b) The horizontal distance is expressed as;

S = Uxt

S = 15(3.33)

S  = 50m

Hence the horizontal distance from the cliff where the car entered the water is 50m

c) The velocity of the car v.

Using the equation of motion;

v² = u²+2gS

v² = 15²+2(9.8)(25)

v² = 225+490

v = √715

v = 26.74m/s

Hence the car hit the water at the velocity of 26.74m.s

Answer:

C

Explanation:

A theory does not have any proven facts about it, it is just a theory, so this would likely be the best option.

Answer:

A. Scientific theories attempt to explain an entire group of related phenomena.

Explanation:

Answer:

a

Explanation:

Answer:

yes, a stone in the ground is a example of newtons first law of motion because it does change it position until an external force is applied.

(Newton’s first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. )

Explanation:

Answer:

[tex]a=0.125\ m/s^2[/tex]

Explanation:

Given that,

Mass of Efua, m = 40 kg

Force, F = 5 N

We need to find Efua's resulting acceleration. We know that the force acting on an object is given by :

F = ma

where a is acceleration

[tex]a=\dfrac{F}{m}\\\\a=\dfrac{5\ N}{40\ kg}\\\\a=0.125\ m/s^2[/tex]

So, the resulting acceleration is [tex]0.125\ m/s^2[/tex].

Answer:

Same

Ben.

Explanation:

m = Mass Bonnie and Ben lift = 50 kg

s = Displacement of mass by both the students = 0.6 m

Work done by both the student is

[tex]W=Fs\\\Rightarrow W=10\times 50\times 0.6\\\Rightarrow W=300\ \text{J}[/tex]

The amount of work done by both the students will be equal to 300 J.

[tex]t_1[/tex] = Time taken by Bonnie = 1 minute = 60 seconds

[tex]t_2[/tex] = Time taken by Ben = 10 seconds.

Power delivered by Bonnie

[tex]P=\dfrac{W}{t_1}\\\Rightarrow P=\dfrac{300}{60}\\\Rightarrow P=5\ \text{W}[/tex]

Power delivered by Ben

[tex]P=\dfrac{W}{t_2}\\\Rightarrow P=\dfrac{300}{10}\\\Rightarrow P=30\ \text{W}[/tex]

So, power delivered by Ben is more.

Answer:

B

Explanation:

A is summer, C is winter, B should be fall in-between those 2

Power describes the rate of the work that is being done. The correct option is A.

Power is defined as the rate at which work is done or the amount of work done per unit time. In other words, power describes how quickly work is being done or how fast energy is being transferred.

The unit of power is the watt (W), which is equal to one joule of work per second.

Power can be calculated by dividing the amount of work done by the time it takes to do that work, or by multiplying the force applied by the distance traveled and dividing by the time it takes to travel that distance.

For example, if a machine does 100 joules of work in 10 seconds, then the power of the machine is 10 watts, calculated as:

Power = Work / Time

Power = 100 J / 10 s

Power = 10 W

Therefore, power describes the rate or speed at which work is being done, and it is measured in watts.

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a.  communicate the solution

Answer:

B. people with OCD know their disorder is irrational

Explanation:

Got it right

Answer:

B

Explanation:

Edge2021

Answer:

μ = 0.1

Explanation:

In order to keep the car on circular track, the centripetal force must be equal to the frictional force between tires and track:

Frictional Force = Centripetal Force

μmg = mv²/r

μ = v²/gr

where,

μ = coefficient of friction = ?

v = speed of car = 10 m/s

g = 9.8 m/s²

r = radius of track = 100 m

Therefore,

μ = (10 m/s)²/(9.8 m/s²)(100 m)

μ = 0.1

Answer:

4

Explanation:

TRUST ME AND I AM SORRY IF RONG

Answer:

The real answer should be 1391. Considering the mass x acceleration

Answer:

D = 72.96 km,      θ = 36.43º

Explanation:

This is a vector addition exercise, we are going to solve it by decomposing the displacements.

First displacement

         cos 35 = x₁ / L

         x₁ = L cos 35

         cos 35 = y₁ / L

         y₁ = L sin 35

         x₁ = 22.0 cos 35 = 18.0 km

         y₁ = 22 sin 35 = 12,619 km

Second displacement

         cos 60 = x₂ / L

         x₂ = L cos 60

         x₂ = 47 cos 60 = 23.5 km

        sin 60 = y₂ / L

        y₂ = L sin 60

        y₂ = 47 sin 60 = 40.70 m

In total displacement it is

       x_total = x₁ + x₂

       x_total = 18 + 40.7 = 58.7 km

       y_total = y₁ + y₂

       y_total = 12.629 +40.70

       y_total = 53,329 km

Let's use the Pythagorean theorem

        D = √(x_total² + y_total² )

        D = √ (58.7² + 43,329²)

        D = 72.96 km

For the direction we use trigonometry

         tan θ = y_total / x_total

         θ= tan-1 (43,329 / 58.7)

         θ = 36.43º

Answer:

I = 1.944 A

Explanation:

Given the following data;

Charge, Q = 3.5C

Time, t = 1.8 secs

Charge of a substance is given by the formula;

[tex] Q = It[/tex]

Where;

Q is the amount of charge measured in Colombs.

I is the current measured in Amperes.

t is the time measured in seconds.

Making I the subject of formula, we have

[tex] I = \frac {Q}{t} [/tex]

[tex] I = \frac {3.5}{1.8} [/tex]

I = 1.944 A

Therefore, the current in the circuit is 1.944 Amperes.

Answer:

When the person is drunk the car travels 20.1 meters more than when the person is sober. The distance traveled by car is:

Person drunk: 28.1 m

Person sober: 8 m     

Explanation:

The distance traveled can be found using the following equation:

[tex] v = \frac{x}{t} \rightarrow x = v*t [/tex]

Where:

v: is the speed = 90 km/h

t: is the time

When the person is sober, the time that takes to hit the brakes is 0.320 s, so we have:

[tex] x = v*t = 90 \frac{km}{h}*\frac{1 h}{3200 s}*0.320 s = 8 \cdot 10^{-3} km = 8 m [/tex]

And when the person is drunk, the time is 1.00 s, hence the distance is:

[tex] x = v*t = 90 \frac{km}{h}*\frac{1 h}{3200 s}*1 s = 0.0281 km = 28.1 m [/tex]

The distance traveled by the car when the person is drunk compared when the person is sober is:

[tex] d = 28.1 m - 8 m = 20.1 m [/tex]

Therefore, when the person is drunk the car travels 20.1 meters more than when the person is sober.  

I hope it helps you!

Answer:

oke

Explanation:

v=d\t

=6.9\3

=2.3m\s

Answer:

240 N

Explanation:

The Centripetal force of the spun ball is 240 N.

The Centripetal force can be calculated using the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, The Centripetal force of the spun ball is 240 N.

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Answer:

735 J

Explanation:

From the question given above, the following data were obtained:

Weight (W) = 49 N

Height (h) = 15 m

Potential energy =?

Potential energy is simply defined as the product of weight of the object and height to which the object is raised. Mathematically, it is expressed as:

Potential energy = weight × height

With the above formula, we can obtain the potential energy of the coconut as follow:

Weight (W) = 49 N

Height (h) = 15 m

Potential energy =?

Potential energy = weight × height

Potential energy = 49 × 15

Potential energy = 735 J

Thus, the potential energy of the coconut is 735 J

Answer:

The value is [tex]\lambda = 684 \ nm[/tex]

Explanation:

From the question we are told that

     The order of the dark fringe is  m  =  2

      The diffraction angle is  [tex]\theta = 20^o[/tex]

       The diffraction grating is  [tex]l = 200\ lines\ per\ mm \ = \ 200000\ lines\ per\ m[/tex]

Generally separation between the slits is mathematically represented as

        [tex]d = \frac{1}{ 200000}[/tex]

=>      [tex]d = 5 *10^{ -6} \ m[/tex]

Generally the condition for destructive interference is mathematically represented as

            [tex]dsin(\theta ) = (m - \frac{1}{2} ) \lambda[/tex]

=>    [tex]5 *10^{-6} sin(20) = [2 + \frac{1}{2}] * \lambda[/tex]

=>   [tex]\lambda = 684 *10^{-9} \ m[/tex]

=>   [tex]\lambda = 684 \ nm[/tex]

Explanation:

When the object is placed at centre of curvature (C) of a concave mirror, a real and inverted image is formed at the same position. Properties of image: Same size of object.

The hormonal, cardiovascular, central nervous and respiratory systems are all involved in this response.

The body is equipped to respond to emergency situations through the fight and flight hormones secreted by the adrenal gland. This chemical messengers send a message to the brain which now causes reactions such as increased pumping of blood by the heart and a faster breathing rate by the lungs.

Hence, the hormonal, cardiovascular, central nervous and respiratory systems are all involved in this response.

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This is kinda confusing. I wish u just to a screenshot of the problem but here goes...

Forest at highest latitudes- Hardwood trees/deer, squirrel, foxes

Praries/temperate climate- Mostly small mammals/scrubs/steppes

High humidity/rainfall near equator- Abundant thick vegatation/manny species

No trees/ polar bears/ mosses- 25cm rain/few animals

To reach the soccer field located 22 m from the school, required horizontal velocity  is 25.88 meter/second.

The primary indicator of an object's position and speed is its velocity. It is the distance that an object travels in one unit of time. The displacement of the item in one unit of time is the definition of velocity.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

The time of falling of the ball = √(2h/g)

= √( 2 × 3.5/9.8) second.

= 0.85 second.

hence, to reach the soccer field located 22 m from the school, required horizontal velocity = distance/time

= 22 meters/0.85 seconds

= 25.88 meter/second.

Hence, the required horizontal velocity  is 25.88 meter/second.

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Answer:

GPE = 0 (when the golf is downhill)

GPE = 0.81 [J](when the golf is at the highest point of the hill)

Explanation:

In order to solve this problem, we must use the principle of energy conservation, which tells us that energy is transformed from kinetic energy to potential energy or vice versa.

We must define a reference energy point, where at this point the potential energy is zero. Let's take this point at the bottom of the hill.

At this point where the potential energy is zero, all the potential energy will have been transformed into kinetic energy, at this point the velocity will be maximum.

[tex]E_k=E_p\\where:\\E_{p}=m*g*h\\E_{k}=\frac{1}{2} *m*v^{2}[/tex]

where:

m = mass = 45 [g] = 0.045 [kg]

g = gravity acceleration = 9.81 {m/s²]

h = elevation [m]

v = velocity = 6 [m/s]

[tex]E_{k}=\frac{1}{2}*0.045*(6)^{2} \\E_{k}=E_{p}=0.81 [J][/tex]

GPE = 0 (when the golf is downhill)

GPE = 0.81 [J](when the golf is at the highest point of the hill)

Answer:

H = 6 atoms

K= 2 atoms

O = 2 atoms

Answer:

H is 6 atoms K is2 atoms and O is 2 atoms

Explanation:

Answer:

baboons??

Explanation:

Answer:trumps downfall

Explanation:Baboons harrases monkeys