PHYSICS MIDDLE SCHOOL

Some dog owners use a whistle in training that emits a very high-pitched noise that only dogs are able to hear. Is the dog whistle manipulating amplitude or frequency?

Answers

Answer 1

Answer:

The dog whistle is manipulating frequency. This is further explained below. Option B is correct.

What is a high-pitched noise?

The sound of a high-pitched sound is harsh and has a high pitch. Examples are:

On the blackboard.
The school bell rings.
Whistle.
The sound of rubber sneakers squeaking on a basketball court.

In conclusion, for a high pitch, we alter the frequency.

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Adam's dad takes the parkway to work. It takes him 45 minutes to travel from mile marker 145 where he enters the parkway to his exit at mile marker 98. What is his average speed?1. 62.7 mph

2. 47 mph

3. 1 mph

4. 193.3 mph

Answers

speed=distance/time

see his distance

distance is from 145 to 98
145-98=47 miles

time
60 mins per hour
45 mins =time
time=45/60 hours=0.75 hours

47 miles per 0.75 hours
47/0.75=62.6666666 mph

first one is option

A beaker of vegetable oil contains a beam of light that is aimed at a surface at an angle of 34 degrees as shown. If the index off refraction of the oil is 1.47, what is the angle of reflection?

Answers

Answer:

Angle of reflection of light is 34 degree

Explanation:

As per law of reflection of light we know that

angle of incidence of light = angle of reflection of light

So here we know that

angle of incidence on the surface of oil is given as

$\theta_i = 34 degree$

so we know that

$\theta_i = \theta_r$

so here we can say that reflection angle of light will be same as angle of incidence

$\theta_r = 34 degree$

Marina is creating a flow chart of the mechanics of mantle convection and how it relates to tectonic plate movement.

Answers

Evidence of the existence of large-scale convection in the mantle from the top to the bottom of the mantle is the density of the material in the lower mantle according shock compression silicates. Calculations showed that under appropriate pressure and temperature distribution of the density in both parts of the mantle are well distributed density oceanic lherzolites - breeds raised in the transform faults of the ocean floor. This is evidence of the homogeneity of the chemical composition of the mantle at the same time is an indirect indication of the existence of large-scale convection in it, constantly stirring its substanceAnd this convection drives plate tectonics

Waves keep their what even when they bounce of something

Answers

the answer is shape, waves keep the same shape when bouncing off something

When energy (heat) is added to matter the molecules (particles) move _______ and farther ______.

Answers

Answer:

energy

Explanation: transferred from the warmer object to the cooler one. The movement of thermal energy from a substance at a higher temperature to one at a lower temperature is called heat. When a substance is heated, it gains thermal energy. Therefore, its particles move faster and its temperature rises.

The answer is energy!!!!

The red sphere represents a proton. What is the atomic number of this atom

Answers

The atomic number is the number of protons of the atom.

So, just count the number of red spheres (protons) and that is the atomic number of the atom.

The protons are in the nucleus of the atom. Every single element is formed by a representative number of protons (atomic number).

For example, every hydrogen atom has one proton and its atomic number is one.

Every helium atom has two protons and its atomic number is two.

And so on. This permits you to order the elements in the periodic table in increasing atomic number.

There are no two elements with the same number of protons (atomic number) and all the atoms of a same element have the same number of protons.

The atom is apparently too small for us to see,
so we can't identify it.

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