PHYSICS HIGH SCHOOL

Density is found by dividing ____.a. mass by volume
c. mass by area
b. volume by mass
d. area by mass

Answers

Answer 1
Answer: Mass represents the density of an object multiplied with the volume it occupies. As a result, an object's density is found by dividing its mass by its volume. So the answer is a.
Answer 2
Answer:

Answer: is

mass by volume

Explanation:

same quiz

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If we decrease the distance an object moves we will

Answers

... without changing the speed of the object, then
we will not have to wait so long for the object to get
where it is going.
If we decrease the distance an object moves, we will decrease the amount of work done.

When light falls on a soap bubble or on the oily film spread on a water puddle, a spectrum of colors is observed. How is this spectrum of colors formed? 1) separation of white light by a prism 2) absorption of colors in a pigment present 3) constructive and destructive interference of light waves 4) reflection of light by soap bubble or oil film

Answers

Answer:

Option 3) Constructive And destructive interference of light waves

Explanation:

When the light is incident on a soap bubble of certain thickness it constructively interferes for wavefronts which are in phase to produce white light and when the wavefronts are out of phase, they undergo destructive interference to produce a series of colors. Thus, interference is the reason.

A single star in the process of forming starts by spinning slowly (while it is quite large and relatively cool.) As the star collapses under the pull of its own gravity, its size decreases. As a result, its rate of spinning:_____.

Answers

Answer:

Explanation:

According to the conservation of momentum, when the external torque is not applied on the system, then the angular momentum of the system is conserved.

I x ω = constant

I_(1)\omega _(1)=I_(2)\omega _(2)

where, I is the moment if inertia and ω is the angular velocity

As the star is collapsed, the radius decreases and hence the moment of inertia also decreases.

According to the law, the angular velocity increases, thus the rate of spinning increases.

A mirror with a flat surface is aA. plane mirror.
B. convex mirror.
C. concave mirror.
D. virtual mirror.

Answers

This kind of a mirror is called a Plane mirror.

Other types mentioned here are not flat surfaces.

Answer:

The correct answer is option A, Plane Mirror

Explanation:

A plane mirror has a flat surface while remaining concave and convex mirror have bulging surfaces. A concave mirror is a converging mirror while a convex mirror is a diverging mirror. Having a planar surface, the angle of incidence and reflection is equal in a plane mirror. There is nothing like a virtual mirror however the mirrors have the ability to form virtual image.  

Thus among all the options, option A is correct

This man proposed that all matter was composed of atoms

Answers

john dalton proposed that all elements and matter is composed of atoms.

Answer:

Dalton's atomic theory proposed that all matter was composed of atoms, indivisible  and indestructible building blocks. while all atoms of an element were indentical  , different  element had atoms  of differing size and mass.

Explanation:

hope it's helpful

Lara has noticed that all of her friends are very careful about what they eat, and they are all much thinner than she is. She wants to be healthy, but she really wants to fit in with her friends. What is the best step for Lara to take?A. Talk to a trusted adult to help her evaluate her eating and exercise in a healthy way.
B.Ask her friends how they stay so thin, and use the same strategies.
C. Find new friends who are not as thin so she doesn't feel any pressure.
D.Try out the newest diet she's seen advertised on TV to help her lose the weight she wants to lose.

Answers

Answer: Option (A) is the correct answer.

Explanation:

If Lara wants to be healthy, and really wants to fit in with her friends then she should talk to a trusted adult to help her evaluate her eating and exercise in a healthy way.

This is because a trusted person will give her beneficial advice as compared to any other person or any advertisement on TV which may promise false results in order to sell their product.

This may also lead to harmful effects on her health. Thus, she should eat and exercise in a healthy way.

A. Talk to a trusted adult to help her evaluate her eating and exercise in a healthy way.
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