PHYSICS HIGH SCHOOL

An object will float in water if it weighs __________.a) less than the amount of water it displaces

b) more than the amount of water it displaces

c) less than a gram

d) more than a gram

Answers

Answer 1
Answer: An object will float in water if it weights less than the amount of water it displaces.

Answer: a)  less than the amount of water it displaces.
Answer 2
Answer:

I think the answer would be A. less than the amount of water it displaces.

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A scientific model is based on assumptions that limit where and how the model can be applied. True False​

Answers

Answer:

i think it is true

Explanation:

Which is the best description of a change in society that has resulted from advances in understanding the causes of diseases?

Answers

The best answer to the question stated above is letter B.
 Improved methods of sanitation best describes the  change in society that has resulted from advances in understanding the causes of diseases.

Choices to this question are:
A. An increased number of hospitals
B. improved methods of sanitation
C. improved use of microscopes
D. increased wages for healthcare workers.
The correct answer is B. improved methods of sanitation on e2020.

A marble statue has a mass of 6,200 grams and a volume of 2,296 cm3. What is the density of marble?

Answers

d= m/v
d= 6200/2296
density = about 2.7

An object having a net charge of 28.0 µC is placed in a uniform electric field of 660 N/C that is directed vertically. What is the mass of this object if it "floats" in the field?(Hint: If an object "floats" consider what this means for the sum of the forces acting on it.)

Answers

Answer:

The mass of this object is \mathbf{1.71*10^(-3)\,kg}

Explanation:

If an object floats, it means by Newton’s second law that the sum of the forces acting on it are equal to zero because it’s at rest, as you can see on the figure below, the only two forces acting on the charged particle are the weight (W) and the electric force (Fe) due the electric field (E), so Newton’s second law in this case is:

\sum\overrightarrow{F_(y)}=0

F_(e)-W=0

W=F_(e)(1)

But weight is mass (m) times gravity acceleration (g) and the magnitude of the electric force is the product of the external electric field (E) and the charge of the particle (q), so using that on (1) and solving for m:

mg=qE

m=(qE)/(g)=((28.0*10^(-6))(600))/(9.8)\approx\mathbf{1.71*10^(-3)\,kg}

An unbalanced force of 25 N, E, is applied to a 12-kg mass. What is the acceleration given to the mass?

Answers

Newton's second law states: F=m*a

F stands for force
m stands for mass
a stands for acceleration

Get a alone.

(F)/(m)=a or a=(F)/(m)

Plug in the values you have.

a=(25N)/(12kg)

This gives:

a = 2.5(m)/(s^2)E

A precipitation reaction is a reaction between two aqueous __________ that results in the formation of a solid compound.

Answers

It is between 2 aqueous solutions that results in a formation of a solid compound

Answer:

A precipitation reaction is a reaction between two aqueous Solutions that results in the formation of a solid compound.

Explanation:
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