Describe a ways car manufacturers try to reduce drag and why.

Answers

Answer 1

Answer: Aerodynamic drag can be reduced by altering the density of the air and the vehicle speed, but these factors are not easily controlled. Instead, to reduce drag, car manufacturers can make the height and width of the front of the car smaller. ... This shape reduces drag and the forces that try to propel the car backwards

Answer 2

Answer:

Aerodynamics is a way to reduce drag that uses car manufacturers.

What is aerodynamic ?

Aerodynamics is the motion of the air. airplane flies cause of aerodynamics.

Aerodynamics is the study of forces that are resulted by motion of the air.

To reduce the aerodynamic drag further, the manufacturers use character lines on the exteriors of the car's body right from its concept stage. These lines help the air to pass smoothly over the body and thus, reducing the air resistance.

cars have flat vertical face in front. When it moves through air, drag force directly proportional to the velocity applies on the car which opposes motion of the car. after studding aerodynamics when we make triangular like shape to the front body of the car, it cuts the air and front air goes from side of the car which reduces oppose to the motion, and car can have more speed.

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Which describes an object’s speed in free fall?

Answers

"Free fall" is the motion of an object when gravity is the ONLY force
acting on it.

In true 'free fall' the speed of an object increases at a constant rate
for the total duration of the fall. The rate of increase, on or near the
Earth's surface, is 9.8 meters per second for each second of fall.

True free fall is almost impossible to observe in everyday life, because
whenever we see anything falling, it's almost always falling through air,
so gravity is NOT the only force acting on it. The friction due to the
motion through air works against the gravitational force. In many cases,
the result is that the object's speed eventually stops increasing and
becomes constant, at a speed often described with the faux technical,
high-fallutin' sounding phrase "terminal velocity". It must be understood
that 'terminal velocity' is NOT a property of gravity or of free fall, but is
only a result of falling through some surrounding stuff that interferes with
the process of true 'free fall'.

An objects falling speed will increase until it is at what is called terminal velocity, meaning it can't go any faster, it will stay at the same speed, until it hits the ground.

A team of psychologists is studying how negative feedback affects self-esteem in independent cultures, such as the United States, and interdependent cultures, such as Japan. These psychologists are most likely working from the __________ perspective. A. biological B. sociocultural C. evolutionary D. psychodynamic

Answers

Answer: The correct answer for the blank is-

B. sociocultural.

Sociocultural theory for learning was proposed by psychologist Lev Vygotsky. According to this, behavior of an individual can be influenced by his surrounding that includes caretakers, society, peers, and culture at large.

As per the information in this question, a team of psychologists is studying how negative feedback ( a reaction that leads to decrease in the function/ activity) affects self-esteem in different cultures.

Therefore, it indicates that the psychologists are working from the sociocultural perspective.

the correct answer to this is choice B . sociocultural

A 60 kg person walks up a 75 m tall hill. How much gravitational potential energy do they have at the top of the hill?

Answers

Answer:

45,000 J

Explanation:

The gravitational potential energy of a body can be found by using the formula

GPE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

GPE = 60 × 10 × 75

We have the final answer as

45,000 J

Hope this helps you

A hydrogen atom has one proton, two neutrons, and no electrons. Is this atom neutrally charged? Explainyour answer.

Answers

It is an ion.

What is hydrogen atom?

A hydrogen atom is an atom of the chemical element hydrogen.

The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force.

An atom is a neutral species.

Hence, it must have same number of electrons and protons. On other hand, ions have charge.

So, the number of protons and electrons are not same.

According to the question,

Hydrogen has one proton, two neutrons, and no electrons.

This signifies that overall charge of species is +1.

Hence, it is an ion.

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Even if it isn't a hydrogen atom, it would be positive because the proton is positively charged and then there are no other charges, so it's positive.

Any projectile always has a constant horizontal acceleration of _______.A. 9.81 m.s^2
B. 0 m/s^2
C. -9.81 m/s^2
D. It is not constant.

Answers

Answer: B. $0 m/s^(2)$

Explanation:

When we talk about projectile motion, we have to deal with parabolic motion, which has two components: vertical and horizontal.

In the case of Earth, the acceleration is due gravity, which is constant and directed downwards (vertically) and have a value of $9.8 m/s^(2)$ .

Now, in the case of the horizontal component, the acceleration will always be zero.

This is because we are dealing with parabolic movement, the x-component of the velocity remains the same (hence, there is no acceleration), while the y-component always change because it is affected by the acceleration due gravity that acts verticaly.

The Earth has a radius of 6,400 kilometers. A satellite orbits the Earth at a distance of 12,800 kilometers from the center of the Earth. If the weight of the satellite on Earth is 100 kilonewtons, the gravitational force on the satellite in orbit is?It would be great if you could add a few words of explanation.

Answers

By using a universal gravitational force, we can get that $F_(g) = (G. m_(1) . m_(2))/( r^(2) )$ .

For note : r is a distance from center of the earth to the object.

Then, if $r_(1)$ is 6.400 km, and if $r_(2)$ is 12.800 km,
we can say that $r_(2)$ is $2r_(1)$

In first equation we can say that :
$F_(g) = (G.m_(1) m_(2) )/( r_(1)^(2) ) = 100.000 N$

then in second equation we can say that :
$F_(g) = (G.m_(1) m_(2) )/( r_(2)^(2) )$ ,
$F_(g) = (G.m_(1) m_(2) )/( (2r_(1))^(2) )$ (because $r_(2)$ is $2r_(1)$ )
$F_(g) = (G.m_(1) m_(2) )/( 4r_(1)^(2) )$ ,
we can say that : $F_(g) = (1)/(4) (G.m_(1) m_(2) )/( r_(1)^(2) )$
so, by plugging first equation into second equation, we can get
$F_(g) = (1)/(4) (G.m_(1) m_(2) )/( r_(1)^(2) ) = (1)/(4) . 100.000 N = 25.000 N$

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