HELP IM IN A EXAM!!!
Which organisms are most closely related?
species A and B
species A and C
species B and C
species C and D

The answer is B- the slope of a velocity vs. time graph.

When a car spends two hours driving at 20 km/h, and then an hour driving at 50 km/h. then the average speed of the car would be 30 km/h , therefore the correct answer is option D.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is meter/second. The generally considered unit for speed is a meter per second.

The mathematical expression for speed is given by

average speed = total distance /Total time

As given in the problem A car spends two hours driving at 20 km/h, and then an hour driving at 50 km/h

The total distance covered by the car is

S =2×20 +1×50

 =90 km

The total time taken by the car is

T = 3 hour

then by using the formula for the average speed

average speed = total distance /Total time

By substituting the respective values of the total speed and total time

average speed = 90/3 km/h

                          =30 km/h

Thus, The correct answer is option D because a car's average speed would be 30 km/h if it spent two hours traveling at 20 km/h and one hour traveling at 50 km/h.

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Answer:

all existing matter and space

Explanation:

Answer:

The universe diameter is unknown

Explanation:

Answer:

Gravitation for exert on block along slope = Mgsin30

Since net force is 0 (constant speed)

Frictional force = Mgsin30

C(friction) = Frictional Force/Normal Force

Normal Force = Mgcos30

C(friction) = Frictional Force/Normal Force

=Mgsin30/Mgcos30

= tan 30

=0.577

Explanation:

Answer:

B) an alcohol-inspired coma

There are three types of alcohol one is primary second is secondary and third is tertiary. Therefore, the correct option is option B that is  an alcohol-inspired coma.

Alcohol is a chemical molecule with a functional group called hydroxyl linked to a saturated carbon atom. Alcohols classified as primary have just one alkyl group on which the carbon atom of the hydroxyl group (OH) is connected.

Secondary alcohols are those that have two alkyl groups on either side of the carbon atom of the hydroxyl group. In tertiary alcoholic group, the carbon that is bonded to hydroxyl group is bonded to three alkyl groups. If a person rapidly drinks a large amount of alcohol, it could lead to what is known as an alcohol-inspired coma.

Therefore, the correct option is option B.

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Answer: A  a mechanical wave travels through empty space, while an electromagnetic wave travels through matter.

Explanation: A mechanical wave travels through empty space, while an electromagnetic wave travels through matter. A mechanical wave has a short wavelength, while all electromagnetic waves have long wavelengths.

When an athlete perspires after running

When an athlete perspires after running evaporation occurs and helps to cool the body.

Correct option is A.

When an athlete perspires after running then sweat evaporates and we know that evaporation causes cooling as evaporation requires heat energy. The required heat energy is taken away by the molecules of sweat when they convert from liquid into gas, and this causes cooling on the surface of body. That's why it helps to cool the body.

Answer:

floating is important in swimming because if you are ever in a bad position possibly in the ocean and get tired of swimming you can float.

Explanation:

Answer: Air resistance is "pushing" the ball upwards.

Explanation:

Answer:

True

Explanation:

The Gravitational potential energy is given by:

G = mgh

m = mass of body ; g = acceleration due to gravity ; h = height

G for a ball of mass 10kg ; height of 20 meters above the ground

G = 10kg * 9.8m/s² * 20m = 1960 kgm²/s²

G for a ball of mass 1000kg at height, 0 meters :

G = 1000 * 9.8 * 0 = 0

1960 > 0

Hence, Gravitational potential energy for 10kg ball at height 20m is greater Thammfor a 1000kg ball on the ground.

Answer:

angular acceleration =final angular speed + initial angular speed

                                                                     time

                                  =0.6283rad/s +0

                                            24.6s

                                   =0.6283/24.5

                                   =0.025rad/s^2

Explanation:

first angular speed is equal to angular velocity and we will convert the unit to rad/s so 1rev/sec=6.283rad/s then angular acceleration is the rate at which the angular velocity changes with the time we have the final angular velocity,initial angular velocity and time now substitute the numbers in the formula and the value will be 0.025 rad per seconde square

Answer:

Explanation:

90

Th

232.04

Box that and there is your answer.

Answer:

Explanation:

90

Th

232.04

Answer:

The satellite is pulling up on Earth with a force of 2000N

Explanation:

According to Newton's third law of motion, the satellite is pulling up on Earth with a force of 2000N

Newton's third law of motion states that "Action and reaction are equal and opposite".

As the earth pulls the satellite in space with an action force of gravity, based on Newton's third law of motion, a reaction force acting in an opposite direction is also in place.

This reaction force is that of the satellite.

Answer:it’s c

Explanation:

Answer:

an unstable atomic nucleus emits energy

Explanation:

just toke quiz

Answer:

Total displacement = 0

Explanation:

He lives his front porch and still returns to his front porch.

Now, displacement is a vector quantity and as such, it is the distance between the initial point of movement and the final point of movement.

In this case the initial point is the same as the final point and thus the displacement is zero.

Answer:

A. heat

Explanation:

heat isn't a physical thing like all the rest of the options

Answer:

Explanation:Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2). Acceleration is also a vector quantity, so it includes both magnitude and direction

Answer:

c on edge

Explanation:

Answer:

I don't know sorry brother/sister

Explanation:

please mark as brilliant

Answer:

a) 0.01s

b) 100Hz

Explanation:

Period is defined as the time taken by a wave to complete 1 oscillation.

Since the object completes 2500 cycles in 25secs, we can write

2500cycles = 25secs

1 cycle = x

Cross multiply

2500x = 25

x = 25/2500

x = 0.01secs

Hence the period of its rotation is 0.01secs

b)  is the reciprocal of the period

Frequency = 1/Period

Frequency = 1/0.01

Frequency = 100Hertz

Hence the frequency of rotation is 100Hz

Answer:

the rate of change of velocity

Answer:

i think the answre is C but the option is not complete !

Answer:

we cannot see anything through an opaque object

Answer:

pushes or pulls

Explanation:

hope this helps....

it is called the trust Answer:

Explanation:

Answer:

No. of electrons = 88

Explanation:

Given that,

No. of protons = 88

No. of neutrons = 226

We need to find the number of electrons it have in a radium atom.

In an atom, the number of protons is equal to the number of electrons. There are 88 protons in this case.

Hence, there are 88 electrons in the radium atom.

Answer:

Explanation:

The wire in the windings needs to be insulated. Electricity takes the shortest path from one place to another. If the wire is bare, then adjacent turns are touching. The result is the current flows through the shortest path between the leads of the electromagnet, never flowing through a single turn of the coil.

If you found my answer useful then please mark me brainliest.

Answer: It will short between the windings; the current rather than passing around and around and around the core will just pass across the surface and create no magnetic field (which is proportional to the number of turns it takes around the core).

Explanation: If naked wire is used then the iron rod also acts as a conductor and short circuit takes place instead of showing magnetic effect of electricity to the molecules of the rod. Hence, naked wire is not used while making electromagnet.

Answer:

inversely proportional

Explanation:

I know this because I'm learning this right now. My teacher told me that Coulomb's Law is important because it shows us the positive and negative attraction between the two charges. It also tells us that if we have two like charges, then they're going to repel, but the closer they get, the bigger charge it's going to have. Coulomb's Law tells us the force between charged particles is inversely proportional to their charges.

Answer:

P = 0

Explanation:

Momentum is defined as the quentity of motion contained in a body. Mathematically, it can be defined as the product of mass and velocity. So, in order to determine the Volkswagen Beetle, at rest, we can use the simple formula, as follows:

[tex]P = mv[/tex]

where,

P = Momentum of Volkswagen Beetle = ?

m = Mass of Volkswagen Beetle = 750 kg

v = Velocity of Volkswagen Beetle = 0 m/s (since, it is at rest)

Therefore,

[tex]P=(750)(0)[/tex]

P = 0