1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
padilas [110]
3 years ago
8

An unknown material has a mass of 2.75 g and a volume of 4 cm3. What is the density of the material? Round to the nearest tenth.

Physics
2 answers:
NemiM [27]3 years ago
8 0
The density of a material is given by:
d= \frac{m}{V}
where
d is the density
m is the mass of the sample
V is its volume

In our problem, the material has a mass of m=2.75 g and a volume of V=4 cm^3, so its density is:
d= \frac{m}{V}= \frac{2.75 g}{4 cm^3}=0.69 g/cm^3=0.7 g/cm^3

So, the correct answer is D).
Ksivusya [100]3 years ago
8 0

The density of the material is 0.7 \mathrm{g} / \mathrm{cm}^{3}

Answer: Option D

<u>Explanation:</u>

Density of any material is defined as the amount of mass present in a specified volume. So density is directly proportional to the mass of the object and inversely proportional to the volume in which the mass is present.

So the density will be calculated as the ratio of mass to the volume. Thus as the mass of the unknown materials is given as 2.75 g present in a volume of 4 \mathrm{cm}^{3}, the density will be

         \text { Density }=\frac{\text {Mass}}{\text {Volume}}

Thus,

       \text { Density }=\frac{2.75}{4}=0.7 \mathrm{g} / \mathrm{cm}^{3}

You might be interested in
Helpp pls
Kipish [7]

Answer:

The intensity of the electric field is

|E|=10654.37 \:N/C

Explanation:

The electric field equation is given by:

|E|=k\frac{q}{d^{2}}

Where:

  • k is the Coulomb constant
  • q is the charge at 0.4100 m from the balloon
  • d is the distance from the charge to the balloon

As we need to find the electric field at the location of the balloon, we just need the charge equal to 1.99*10⁻⁷ C.

Then, let's use the equation written above.

|E|=(9*10^{9})\frac{1.99*10^{-7}}{0.41^{2}}

|E|=10654.37 \:N/C

I hope it helps you!

5 0
3 years ago
To be considered a source of water pollution, the source must include a chemical
forsale [732]

To be considered a source of water pollution, the source must include a chemical is false.

<u>Explanation: </u>

The water pollution may be caused either by chemicals or waste materials that doesn’t contain chemicals such as domestic wastes, organic compounds, heavy metals etc. The life on Earth mostly relies on water and air, and if these two gets polluted; the results will be dangerous.

Around 70% of the planet is covered with water and the present state of its purity is a matter of a serious thought. Looking over various pollutants, only chemical wastes are not responsible to pollute the water.

Instead, there is range of elements from plastic scraps to chemical wastes that comes from either the non-point sources or the point sources. There are organic waste materials, heavy metals, volcanic eruptions, Tsunamis, earthquakes, etc. are also responsible to contaminate water and affect the amphibians as well as humans.

8 0
3 years ago
Read 2 more answers
Two blocks with masses 1 and 2 are connected by a massless string that passes over a massless pulley as shown. 1 has a mass of 2
Bess [88]

Answer:

The acceleration of M_2 is  a =  0.7156 m/s^2

Explanation:

From the question we are told that

    The mass of first block is  M_1 =  2.25 \ kg

    The angle of inclination of first block is  \theta _1 =  43.5^o

    The coefficient of kinetic friction of the first block is  \mu_1  = 0.205

      The mass of the second block is  M_2 = 5.45 \ kg

     The angle of inclination of the second block is  \theta _2 =  32.5^o

      The coefficient of kinetic friction of the second block is \mu _2 = 0.105

The acceleration of M_1 \ and\  M_2 are same

The force acting on the mass M_1 is mathematically represented as

     F_1 = T -  M_1gsin \theta_1 - \mu_1 M_1 g cos\theta_1

=> M_1 a = T -  M_1gsin \theta_1 - \mu_1 M_1 g cos\theta_1

Where T is the tension on the rope

The force acting on the mass M_2 is mathematically represented as    

  F_2 =  M_2gsin \theta_2 - T -\mu_2 M_2 g cos\theta_2

   M_2 a =  M_2gsin \theta_2 - T -\mu_2 M_2 g cos\theta_2

At equilibrium

  F_1 =  F_2

So

 T -  M_1gsin \theta_1 - \mu_1 M_1 g cos\theta_1 =M_2gsin \theta_2 - T -\mu_2 M_2 g cos\theta_2

making a the subject of the formula

    a =  \frac{M_2 g sin \theta_2 - M_1 g sin \theta_1 - \mu_1 M_1g cos \theta - \mu_2 M_2 g cos \theta_2 }{M_1 +M_2}

substituting values a =  \frac{(5.45) (9.8) sin (32.5) - (2.25) (9.8) sin (43.5) - (0.205)*(2.25) *9.8cos (43.5) - (0.105)*(5.45) *(9.8) cos(32.5) }{2.25 +5.45}

    => a =  0.7156 m/s^2

     

3 0
4 years ago
PLEASE HELP! I don't get it at all! Speed is one thing; distance is another. Where is the arrow you shoot up at 50m/s when it ru
LuckyWell [14K]
I got you b, V(final)^2=V(initial+2acceleration*displacement
So this turns to (0m/s)^2=(50m/s)^2+2(9.8)(d) so just flip it all around to isolate d so you get
-(50m/s)^2/2(9.8) = d so you get roughly 12.7555 meters up
4 0
3 years ago
Read 2 more answers
WRONG ANSWERS WILL BE REPORTED
denpristay [2]

Answer:

1 = C

2 = B

Explanation:

6 0
3 years ago
Other questions:
  • Jack travelled 360 km at an average speed of 80 km/h. Elaine
    9·1 answer
  • Taylor drives 5 miles in 10 minutes. She stops at a light for 2 minutes. She then travels another 10 miles in 8 minutes. What wa
    14·1 answer
  • As an ice skater begins a spin, his angular speed is 3.14 rad/s. After pulling in his arms, his angular speed increases to 5.94
    12·1 answer
  • While watching some tv you see a circus show in which a woman drives a motorcycle around the inside of a vertical ring. you dete
    15·1 answer
  • A 15-kN tensile load will be applied to a 50-m length of steel wire with E = 200 GPa. Determine the smallest diameter wire that
    8·1 answer
  • A motorbike is travelling with a velocity of 3m/s. It accelerates at a rate of 9.3m/s for 1.8s.
    10·1 answer
  • True or False? Energy is matter.<br><br> 1. False<br><br> 2. True
    13·1 answer
  • What are the two outcomes for a proto star?
    11·1 answer
  • Pls answer ASAP pls and thnk you my friends
    7·1 answer
  • Physics
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!