PHYSICS HIGH SCHOOL

When plug prongs are connected to the metal case of an appliance, a part that should always be placed next to the case is aa. flat metal washer.
b. hexagonal aluminum shoulder.
c. steel nut.
d. mica washer.

Answers

Answer 1
Answer: The correct answer is (d.) mica washer. When a plug prongs are connected to the metal case of an appliance, a part that should always be placed next to the case is a mica washer. Mica washer are used as a window for any radiation detectors.

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A sound-producing object is moving toward an observer. The sound the observer hears will have a frequency ___ that actually being produced by the object. higher than
lower than
same as

Answers

The answer is higher than.
A sound-producing object is moving toward an observer. The sound the observer hears will have a frequency higher than that actually being produced by the object.

Why?
As the source of the waves is moving toward the observer, each of the successive wave crest is emitted from a position closer to the observer than the previous wave.
Thus each wave takes slightly less time to reach the observer than the previous wave. So, the time between the arrival of successive wave crests at the observer is reduced, increasing the frequency. 
Answer: higher than 

This phenomenon is known as the Doppler Effect. It occurs when a sound producing object is approaching towards an observer, it can be noticed that the sound is higher than what it really is. The sound usually fades as the object passes by.

Is a marble rolling across the table kinetic energy

Answers

Not exactly.  A marble rolling across the table is a marble,
and it has mass, weight, momentum, and kinetic energy.

Doubling the voltage in a circuit doubles the current if what is held constant?

Answers

The Resistance needs to be the same to allow the current to double with the voltage.

An unbalanced force of 40. newtons keeps a5.0-kilogram object traveling in a circle of radius
2.0 meters. What is the speed of the object?
(1) 8.0 m/s (3) 16 m/s
(2) 2.0 m/s (4) 4.0 m/s

Answers

This can be answered using the formula of centripetal force. In the given problem, the centripetal force (40 N), mass (5 kg), radius (2 m) are all named, except for the speed. The formula is shown below:

F = mv^2 / r

Substituting the given values:

40 N = 5kg(v^2) / 2
80 = 5 * v^2
v^2 = 16
v = 4

Therefore, the correct answer is 4.0 m/s (4).

What color do you think an object would be if it reflected all colors of the visible spectrum? A.The object would be black.


B.The object would be yellow.


C.The object would be white.


D.The object would be blue.

Answers

c) The object would be WHITE.

We call "white light" to the sunlight, but referred to the visible part of spectrum. If the object reflects all the light, it appears as a white object.

Describe how do ions form?

Answers

Answer:

Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by a combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms.

Explanation:

Answer:

Ion, any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions. Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms. Examples of these processes include the reaction of a sodium atom with a chlorine atom to form a sodium cation and a chloride anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.

Explanation:hope dis helps u

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