PHYSICS HIGH SCHOOL

Tierra is playing in her backyard when she hears her friend calling out to her. She can't see her friend but can hear her friend's voice. Which wave phenomenon helps explain why Tierra can hear her friend even when she can't see her?interference


refraction


superposition


diffraction

Answers

Answer 1
Answer:

Answer : diffraction

Explanation : Diffraction is the phenomenon of bending of sound waves around the small openings or obstacles.

Tierra is playing in her backyard when she hears her friend calling out to her. Tierra can hear her friend even when she can't see her. This is because the sound is spreading out from the small openings and hence diffraction of sound wave occurs.

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You check the weather and find that the winds are coming are coming from the west at 15 miles per hour. This information describes wind's velocity, direction, acceleration, or speed?

Answers

Velocity
It is not showing acceleration, or changes in speed
It is showing direction, but not only that
It is showing speed, but not only that

It is showing speed and direction, which is Velocity

Answer:

velocity

Explanation:

Little is known about much of earth’s early history because ____. a. precambrian rocks have been deeply buried
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d. all of the above

Answers

Little is known about much of earth’s early history because Precambrian rocks have been deeply buried they have been changed by heat and pressure ,Precambrian soft-bodied life-forms weren’t often preserved as fossils.

What is Precambrian rocks?

The Precambrian is the earliest part of Earth's history, set before the current Phanerozoic.

Why are Precambrian rocks rare?

Fossils are rare in Precambrian rocks mostly because Precambrian life-forms lacked bones, or other hard parts that commonly form fossils.

Hence, D is correct option

To learn more about Precambrian, here

https://brainly.in/question/26340735?

#SPJ2
the correct answer is D

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Answers

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The atomic mass of an element whose atoms consist of seven protons, eight neutrons, and seven electrons is _____?a. 7
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Answers

The atomic mass is C. 15

Atomic mass = P + N = 7+8 = 15

The atomic mass of an element is defined as the sum of the protons and neutrons. On the other hand, the atomic number of a neutral element is equivalent to the number of protons or electrons. This is because a neutral element should have equal number of protons and electrons.

Answer:

15

Explanation:

15

As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and floor become warm. During this process, energy is

Answers

If an object is moving or at work, it is considered to be a particle with kinetic energy. In physics, kinetic energy is thought to be the energy of motion, it is an acquisition of energy of an object through the possession of motion. Other forms of kinetic energy are vibration, rotation, and translation.

Answer:

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the jamaican bobsled team hit the brakes on their sled so that it decelerates at a uniform rate of 0.43 m/s, how long does it take to stop if it travels 85 m before coming to rest

Answers

 here's a cheap trick 
it would take the same time to accelerate from rest to top speed 
as it would take to decelerate from top speed to zero 
so 
instead of 
d = Vi t + 1/2 a t^2 where Vi is positive and a is negative 
we'll use 
Vi = 0 and a is positive 
giving 
85 = 0 + 1/2 (0.43) t^2 = 0.215 t^2 
t^2 = 395.345 
t = 19.88s or 20. s to 2 sig figs 

or we ccould find Vi from 
Vf*2 = Vi^2 + 2 a d 
0 = Vi^2 + 2 (0.43) 85 
Vi^2 = 71.4 
Vi = 8.45m/s 
then 
85 = 8.45 t + 1/2 (-0.43) t^2 
85 = 8.45 t - 0.215 t^2 
0.215 t^2 - 8.45 + 85 = 0 
t = 19.65s or 20. s to 2 s.f.(minor difference arises from rounding Vi) 
or another cheap trick 
when a is constant 
Vavg = (Vf + Vi) /2 = 8.45/2 = 4.225 
and 
d = Vavg t 
85 = 4.225 t 
t = 20.12 or 20. s to 2 s.f. (minor differences from intermidiate roundings) 

anyway you choose you get 20. s
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