PHYSICS HIGH SCHOOL

ListenA projectile with mass m is fired with initial horizontal velocity vx from height h above level ground. Which change would have resulted in a greater time of flight for the projectile? [Neglect friction.]decreasing the mass to m/2decreasing the height to h/2increasing the initial horizontal velocity to 2vxincreasing the height to 2h

Answers

Answer 1

Answer:

The only way to increase the time of flight is to increase the height traveled by the projectile to 2h.

The given parameters;

mass of the projectile, = m
initial horizontal velocity, = $v_x$

The time of flight of the projectile is calculated as follows;

$h = v_yt + (1)/(2) gt^2$

where;

$v_y$ is the initial vertical velocity of the projectile = 0

$h = (1)/(2) gt^2\n\ngt^2 = 2h\n\nt = \sqrt{(2h)/(g) } \n\n$

If friction due to air resistance is neglected, the time of flight of the projectile is not affected by its mass.
The initial horizontal velocity is not considered in the vertical direction.

Thus, the only way to increase the time of flight is to increase the height traveled by the projectile to 2h.

Learn more here:brainly.com/question/20427663

Answer 2

Answer:

Answer:

Explanation:

a) decreasing the mass to m/2. FALSE. Mass doesn't influence the equations of accelerated motion.

b) decreasing the height to h/2. FALSE. From a lower initial height the projectile will reach the ground faster.

c) increasing the initial horizontal velocity to 2vx. FALSE. The horizontal and vertical components are independent, and time of flight is dependent only on vertical conditions in this case.

d) increasing the height to 2h. TRUE. From a higher initial height the projectile will reach the ground later.

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Choose "extinct" if the species is extinct and "endangered" if the species is endangered. Sixty years ago, as few as 20 whooping cranes were left on earth. Now, thanks to conservation efforts, there are more than 300 whooping cranes in the wild.

A.extinct

B.endangered

Answers

The species is actually endangered and not extinct because there are only 20 species left. Extinct actually means that there would be no species left and so it an incorrect option. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer has helped you.

Answer:

B.endangered

Explanation:

Choose "extinct" if the species is extinct and "endangered" if the species is endangered.

Sixty years ago, as few as 20 whooping cranes were left on earth. Now, thanks to conservation efforts, there are more than 300 whooping cranes in the wild.

A.extinct

B.endangered

if there are 20 whooping cranes sixty years ago, and then we have more than 300 today. then it means that the species are endangered

I will go with B

An extinct species no longer exist because there are no offsprings of the parent specie which can give birth to more subspecies .

species no longer exist anywhere on Earth, and once gone they are gone ... on International Trade In Endangered Species like Wild Fauna and Flora (CITES). .... in 1975; the species now numbers more than 1, 000 animals .... whooping cranes, this approach fails to protect most endangered species

Endangered means that the existence is threatened by some human activities, prevailing conditions in the environment or the host it feeds on to survive no longer exists within it reach, hence its survival is at stake

Which indicates arson - (pick 2) v shaped burn, multiple point of origin, U shaped burn pattern, pour pattern

Answers

multiple point of origin & pour pattern

The term used to describe the quantity of matter that a body possesses is

Answers

The body mass index.

The term used to describe the quantity of matter that a body possesses is mass.

All electromagnetic radiation is visible to the human eye. Please select the best answer from the choices provideda. True
b. False

Answers

The correct answer is

b. False

It's actually the opposite: only a very small part of the electromagnetic spectrum is visible to human eye.

The electromagnetic spectrum consists of a huge range of wavelengths, spanning from gamma rays (with very short wavelength, at the order of 1 pm) to radio waves (with very long wavelength, at the order of kilometers). The only portion of this spectrum visible to the human eye is the "visible light", which has wavelengths between 400 and 700 nanometers approximately.

The statement is False. All the electromagnetic radiations are not visible to the human eyes.

Explanation:

The waves are defined as the disturbance produced in the medium particles. The wave is basically the physical phenomena that occurs in a medium and it is characterized by the amplitude, wavelength and the frequency of oscillating particles.

The waves are basically characterized as the transverse and the longitudinal based on the direction of oscillation. The transverse waves are the one in which the direction of oscillation is perpendicular to the propagation whereas in longitudinal waves, the direction of oscillation is along the motion of the wave.

The electromagnetic waves are the transverse waves that are formed by the perpendicular magnetic and electric field present in the medium. The complete electromagnetic spectrum is not considered to be in the visible range for the human eye. Only a small part lying in the wavelength of $4000-7000\,\AA$ .

Thus, The statement is False. All the electromagnetic radiations are not visible to the human eyes.

Learn More:

1. Similarities between transverse and longitudinal waves brainly.com/question/3293068

2. A property is a characteristic of a substance that can be observed and does not change the identity of the substance brainly.com/question/859623

3. The amount of kinetic energy an object has depends on its brainly.com/question/137098

Answer Details:

Grade: High School

Subject: Physics

Chapter: Waves

Keywords:

electromagnetic radiation, human eye, visible, transverse, longitudinal, waves, wavelength, particles, perpendicular.

Mechanical waves can travel through _______. vacuums only

both vacuums and mediums

mediums only

Answers

mediums only, mechanical waves always propagate through medium

What is a transverse wave?a. particles that travel parallel to the direction of energy movement
b. particles that travel in a reverse direction to the direction of energy movement
c. particles that travel perpendicular to the direction of energy movement
d. particles that travel in an intersecting direction to the direction of energy movement

Answers

the answer is C. they travel perpendicular to the direction of energy

Answer:

The answer is C

Explanation:

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