A dog barks in a park and hears its echo after 0.5 seconds. The sound of its bark got reflected by a nearby building. The sound of speed in air is 346 m/s. The distance between the dog and the building is

Answer:

Speed is a way of measuring how quickly something is moving or being done, or something moving fast. An example of speed is a car being driven 45 miles per hour. An example of speed is someone cleaning a room in 10 minutes.

Answer:

Linear momentum= Mass*Velocity

P=mv

P=60*10

P=600Kg m/s

Answer:

Little to no scientific advancement

More wide spread diseases

Explanation:

Given : A toy plane has a mass of 1.5kg . It is flying in air at a speed of 8m/s .

To Find : The Kinetic energy of the plane .

Solution : The mass of the toy plane is 1.5kg and Velocity is 8.0 m / s . So we know the formula to find the kinetic energy as ,

[tex]\boxed{\red{\bf Energy_{Kinetic}=\dfrac{1}{2}mv^2}}[/tex]

On substituting the respective values,

⇒ KE = ½mv².

⇒ KE = ½ × 1.5 kg × (8 m/s)².

⇒ KE = ½ × 1.5 kg × 64m²/s² .

⇒ KE = 48 J .

Hence the Kinetic energy of the plane is 48Joules.

The kinetic energy of a plane having a mass of 1.5 kg flying in the air at 8.0 m / s is 48 J.

Kinetic energy is a type of power that a moving object or particle possesses. When an object undergoes work, which involves the transfer of energy, by exerting a net force, the object accelerates and consequently obtains kinetic energy.

A moving object or particle has kinetic energy, which depends on both its mass and its rate of motion. The type of motion can be vibration, rotation on an axis, translation (or travel along a path from one place to another), or any combination of these.

Given:

The mass of the toy plane, m = 1.5 kg,

The velocity of the toy plane, v = 8 m / s,

Calculate the kinetic energy by the formula given below,

[tex]KE = 1/2mv^2[/tex]

Substitute the values,

KE = 1 / 2 × 1.5 × 8²

KE = 1 / 2 × 1.5 × 64

KE = 48 J

Therefore, the kinetic energy of a plane having a mass of 1.5 kg flying in the air at 8.0 m / s is 48 J.

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The puck that required the greatest force to be stopped is puck C, followed by puck B and the least is puck A.

The force needed to stop the pucks or applied to stop the pucks is determined by applying Newton's second law of motion as shown below;

F = ma

F = mv/t

where;

From the quation above, the applied force is directly proportional to the speed of the pucks. Thus, the greater the speed of the puck, the greater the required force to stop the puck.

Therefore, the puck that required the greatest force to be stopped is puck C, followed by puck B and the least is puck A.

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Given parameters:

Speed of the car = 50m/s

Time  = 10s

Unknown:

Distance traveled before the car stopped = ?

We need to establish speed - time - distance relationship.

Speed is the rate of change of distance with time. It is a scalar quantity .

Mathematically;

            Speed  = [tex]\frac{distance}{time}[/tex]

    Distance  = speed x time

Input the parameters and solve;

    Distance  = 50 x 10  = 500m

The car traveled 500m before it stopped.

Answer:

55mph

Explanation:

a 0.11kg moving hockey puck is caught by a 80kg goalie who then slides on the frictionless ice at 0.076 m/s. the initial velocity of the hockey puck was 55mph

Velocity is a parameter which can be defined as the rate at which the object change the position with respect to time, basically speeding the object in a specific direction.

It  is a  vector quantity which shows both magnitude  and direction  and The SI unit of velocity is meter per second (ms-1). the  change in magnitude or the direction of velocity of a body, then it is said to be accelerated.

Finding the total velocity is simple but few calculations and basic conceptual knowledge are needed.

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Answer:

False

Explanation:

Answer: Explanation:

Carbonated drinks are mixtures of water, sugar, flavorings, and dissolved carbon dioxide gas. They are homogeneous because the ingredients are mixed together to form a consistent liquid.

a = v ² / R

where a is acceleration, v is speed, and R is the radius. So

7.5 m/s² = v ² / (1.2 m)

v ² = (7.5 m/s²) / (1.2 m)

v ≈ 6.8 m/s

Answer:

Inter Quartile Range

Explanation:

Quartile is a positional statistical average, which divided the data into 4 equal halves.

Q1 (Lower Quartile) has 25% data below it, 75% above it. Q3 (Upper Quartile) has 75% data below it, 25% above it.

Interquartile range is the measure used to calculate how far the lower & upper quartiles are.

Answer:

60

Explanation:

Answer:

Because environmental history deals with some of the most important issues regarding the future of our planet. The hi/story of nature parks around the globe. understand the impact of humans on pollution and health. It opens our eyes for the scarcity of resources and for their conservation into the future.

Explanation:

:-)

Answer:

One string (side of) must support 1.4 kg.

T cos 15 = vertical force required by each side of the string

T cos15 =  1.4 * 9.8 N

T = 1.4 * 9.8 / cos 15 = 14.2 N

The net force for example A is 4N. The net force for example B is 3N.The net force with N will be calculated by following formulas

FNet = F1 + F2 + F3…. + FN.

FNet = Fa + Fg.

FNet = Fa + Fg + Ff + FN.

where N is the number of forces acting on the body.

This definition refers to the force required to accelerate a kilogram of mass by one meter per second. In the foot-pound-second (English, or customary) system, one newton is equivalent to roughly 0.2248 pounds of force, or 100,000 dynes in the centimeter-gram-second (CGS) system.

A car, for instance, has a net force of zero even though it is moving when it is driving at a steady 50 mph on the highway due to the lack of acceleration.

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Answer:

d

Explanation:

i am smart

Answer:

The answer is B.

Explanation:

Because that's the one that's more-so higher up than the other soccer balls. This grants the ball to have higher potential energy than the rest.

Quote:

"Your body is as weak as your soul, so it is easy to separate the two."

- Akuma

The ball b would have the greatest amount of the potential energy as the mass of each ball is the same then the ball on the highest altitude would have the greatest amount of the potential energy contained with it.

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.

The mechanical energy = potential energy + kinetic energy

As given in the problem, the image here shows four soccer balls at four different locations on an uneven soccer field very near sea level.

The potential energy of the ball = mass×gravity×height

Since each ball's mass is the same, the ball at the highest altitude would have the most potential energy within it. As a result, ball b would have the greatest quantity of potential energy.

Thus,the correct answer is option A.

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Answer:

three symbiotic relationships

The great white shark has each of the three symbiotic relationships. It has a commensalistic relationship with the remora because the remora cleans the shark's body and the shark is unaffected. It has a Parasitic relationship with the germ ommatokoita elongata because the germ is benifited and the shark is harmed.

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Answer:

D. The number of cattle ranchers decreased in the past five years

Explanation:

According to Jennifer M Schieltz and Daniel I Rubenstein (2016), "More than a quarter of earth's land surface is used for grazing domestic livestock." This has negative effects on availability of pasture for herbivorous wildlife such as the deer.

Increase in the number of cattle  ranchers decreases the availability of pasture and vice versa.

Hence, the decrease in the number of cattle ranchers over the past five years led to an increase in the deer population due to a decrease in competition for pasture.

Answer:

Average Velocity: 0

Average Speed 0.8

Explanation:

Velocity - (30-30)/75 = 0

Speed - (30+30)/75 = 0.8

Answer:

I think... i think it's position  3

Explanation:

Answer:

40 dedrees south

Answer:

40 degrees south

Explanation:

Answer:

Physical Properties of Carbon:

Carbon is a unique element. It occurs in many forms. Some examples of the pure form of carbon are coal and soot.

It is soft and dull grey or black in colour.

One of the most important compounds of carbon is the charcoal, which is formed when carbon is heated in the absence in of air.

It occurs in a number of allotropic forms. Allotropes are nothing but forms of an element with varying physical as well as chemical properties.

The density of the different forms of carbon depends upon the origin of these elements. You will find some forms of carbon which are pure and some forms which are not pure like coal which is the mixture of both carbon and hydrogen.

Chemical Properties of Carbon

Carbon compounds generally show 4 reactions, they are

Combustion reaction

Oxidation reaction,

Addition reactions

Substitution reaction.

As we all know that carbon in all forms needs oxygen, heat, and light and forms carbon dioxide. When it is burned in air to give carbon dioxide, it is called as combustion.

Let us get the concept of this using some examples when it is burnt in the air: When methane CH4 is burnt in the presence of oxygen it gives us carbon dioxide, heat, and light.

Explanation:

The answer (distance) is:

The distance of the truck in the given time is 216 m.

Displacement (s) of an object equals, velocity (u) times time (t), plus ½ times acceleration (a) times time squared (t2). Use standard gravity, a = 9.80665 m/s2, for equations involving the Earth's gravitational force as the acceleration rate of an object.

Multiply the acceleration by time to obtain the velocity change: velocity change = 6.95 * 4 = 27.8 m/s . Since the initial velocity was zero, the final velocity is equal to the change in speed. You can convert units to km/h by multiplying the result by 3.6: 27.8 * 3.6 ≈ 100 km/h.

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Answer:

a) 3.9s

b)74m

Explanation:

a) v=u+at

0=38+(-9.8)t

-38=-9.8t

t=-38/-9.8

t=3.877s

t=3.9s

b) s=ut+1/2at²

s=(38×3.9)+1/2(-9.8×3.9²)

s=148.2 -74.529

s=73.671

s=74m

Answer:

m(g - a)

Explanation:

Since he slides with a mass 'm' and acceleration of "a", it means he is sliding in the position of gravity. Thus, Force = ma

Now, the force due to gravity = mg

The overall acceleration of the climber is downward along the rope. So "ma" is negative. Now, the only external forces acting on the person will be the force of gravity acting downward (W = mg) and the supporting Frictional Force F_f.

Thus, the net average frictional force of exerted by the rope on the climber will be;

mg - F_f - ma = 0

F_f = mg - ma

F_f = m(g - a)