PHYSICS HIGH SCHOOL

If the velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration, what's the average velocity of the body? A. 28 m/s
B. 17 m/s
C. 21.5 m/s
D. 19.5 m/s

Answers

Answer 1
Answer:

Since the acceleration is constant, the average velocity is simply the average of the initial and final velocities of the body:

v_(avg) = (v_f+v_i)/(2)=(30 m/s+13 m/s)/(2)=21.5 m/s

We can proof that the distance covered by the body moving at constant average velocity v_(avg) is equal to the distance covered by the body moving at constant acceleration a:

- body moving at constant velocity v_(avg): distance is given by

S=v_(avg)t = (v_f+v_i)/(2)t

- body moving at constant acceleration a=(v_f-v_i)/(t): distance is given by

S=v_i t+ (1)/(2)at^2 = v_i t + (1)/(2)(v_f-v_i)/(t)t^2=(v_i+(1)/(2)(v_f-v_i))t=(v_f+v_i)/(2)t
Answer 2
Answer: The answer is 21.5 m/s

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The effectiveness of an optical lens is attributed to:diffraction
reflection
refraction
interference

Answers

Answer: Refraction.

Explanation: The lenses are used to "transmit" the light that hits the lens in a certain way.

The phenomena in which the light penetrates a medium (where the medium, in this case, is the lens) is called diffraction.

Reflection would be more related to mirrors, difraction is the change of the velocity of the light waves when they are in different mediums, and interference refers to the interaction between two coherent waves (it can be destructive interference, where the waves cancel each other, or constructive interference, where the waves add to each other)

refraction is the right answer

The phrase terminal velocity can best be defined asa. the velocity of any falling object.
b. the velocity of objects with little mass.
c. the constant velocity of some falling objects.
d. the velocity of something falling from a train terminal.

Answers

Answer:

c. the constant velocity of some falling objects.

Explanation:

When a body is dropped (or thrown up) vertically and only the force of gravity acts on it, it is said that the body carries a free fall motion. Free fall is a special case of uniformly varied rectilinear motion.

Therefore, the MRUV formulas will be applied, with a modification: The acceleration of the bodies in free fall is the acceleration of gravity represented by the letter g and is, on Earth, approximately equal to 9'8 m / s2.

An object that falls, initially gains speed.  When gaining speed, the resistance force of the air will increase, which is nothing more than the result of collisions with the air molecules suffered by any object that travels through a layer of air. The greater the number of molecules with which it collides, the greater the resistance. Consequently, the air resistance depends on the speed of the falling object and its surface (its shape).

The object will continue to accelerate until the air resistance force is large enough to compensate for the force of gravity. At that time the object will continue to fall but will do so with constant speed (terminal velocity).
none of these are a good definition; a good definition would be "the maximum velocity that an object can fall at." however the best answer out go those is c. the constant velocity of some falling objects. 

What is the French word for shepherds crook

Answers

The answer would be:

Houlette de berger.
"shepherd's crook"  means   "houlette de berger"  in french

Which of the following statements describes an anticyclone?a. It is an area of low pressure.
b. It is an area of high pressure.
c. It has air masses that meet and rise.
d. It moves in the direction of the Earth’s rotation.

Answers

b. 
srry for short answer :)

Answer:

b is the appropriate answer

Explanation:

An electron and a proton are confined in the same space. For what particle would a measurement of the speed have a greater uncertainty?

Answers


The electron is a subatomic particle, symbol e− or β−, with a negative elementary electric charge. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. The electron has a mass that is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum of a half-integer value in units of ħ, which means that it is a fermion. Being fermions, no two electrons can occupy the same quantum state, in accordance with the Pauli exclusion principle. Like all matter, electrons have properties of both particles and waves, and so can collide with other particles and can be diffracted like light. The wave properties of electrons are easier to observe with experiments than those of other particles like neutrons and protons because electrons have a lower mass and hence a higher De Broglie wavelength for typical energies. Hope this HELPS :D

A projectile was launched horizontally with a velocity of 468 m/s, 1.86 m above the ground. Calculate how long it would take for the projectile to hit the ground, to the nearest tenth of a second. Record your answer in the boxes below. Be sure to use the correct place value.

Answers

Answer:

  0.6 seconds

Explanation:

The time to fall from height h is ...

  t = √(2h/g)

  t = √(2(1.86 m)/(9.8 m/s^2)) ≈ √0.3796 s ≈ 0.616 s

It would take about 0.6 seconds for the projectile to hit the ground.

Answer:

0.6seconds

isuranswer:)

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