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
juin [17]
3 years ago
10

The atomic number of yttrium is 39. The atomic mass of one of its isotopes is 89. How many neutrons are in an atom of this isoto

pe?
Physics
1 answer:
gogolik [260]3 years ago
8 0
50. The atomic mass is essentially a tally of all of the atoms in the nucleus, since electrons are essentially negligible in mass.
You might be interested in
What is one way that early scientific practice differed from modern scientific practice?
mote1985 [20]
Early hypotheses were not based on observations.
Early hypotheses were not tested by experimentation.
Early hypotheses were formed from scientific questions.
Early hypotheses were influenced by creative thinking
6 0
3 years ago
Read 2 more answers
Experts, ACE, Genius... can anybody calculate for the Reactions at supports A and B please? Will give brainliest! Given: fb = 30
dybincka [34]

Answer:

Support at Cy = 1.3 x 10³ k-N

Support at Ay = 200 k-N

Explanation:

given:

fb = 300 k-N/m

fc = 100 k-N/m

D = 300 k-N

L ab = 6 m

L bc = 6 m

L cd = 6 m

To get the reaction A or C.

take summation of moment either A or C.

<em><u>Support Cy:</u></em>

∑ M at Ay = 0

      (( x1 * F ) + ( D * Lab ) + ( D * L bc + D * L cd )

Cy = -------------------------------------------------------------------

                                      ( L ab + L bc )

Cy = 1.3 x 10³ k-N

<em><u>Support Ay:</u></em>

Since ∑ F = 0,           A + C - F - D = 0

                                   A = F  + D - C

                                  Ay = 200 k-N

4 0
3 years ago
Science cannot be used to answer questions about _____.
aksik [14]
Science cannot be used to answer questions about Moral judgements
8 0
4 years ago
Read 2 more answers
When using a micron gauge, if the pressure gauge falls frim 1,300 to 1,000 instantly, the vehicle needs to?
julsineya [31]
If the micron gauge pressure falls instantly, it means that the moisture of the air-conditioning is frozen, therefore you need to move the vehicle to a warmer place in order to unfreeze the moisture.
5 0
3 years ago
A wave can be described as?
aleksley [76]

Answer:

<em>B) The disturbance of particles in an area.</em>

Explanation:

<em>A wave involves transmission of  energy from one place to another by the actual disturbance of the particles of the medium.</em>

<em />

6 0
3 years ago
Other questions:
  • The most important barriers to diffusion today are physical features of Earth's surface.
    5·1 answer
  • In a classroom demonstration, the pressure inside a soft drink can is suddenly reduced to essentially zero. You may want to revi
    14·1 answer
  • A bird is flying due east. Its distance from a tall building is given by x(t) = 28.0 m + (12.4 m/s)t – (0.0450 m/s3)t3. What is
    9·1 answer
  • Which of the following are homogeneous solutions?
    13·1 answer
  • Why should soft porous boards be put in cinema halls?
    15·1 answer
  • Two cannonballs are dropped from a second-floor physics lab at height h above the ground. Ball B has four times the mass of ball
    12·1 answer
  • A topographic map would best provide information about which area? O state boundaries O interstate highways O routes of minor ro
    9·2 answers
  • What is another way to describe the vector 100 m/s down
    5·1 answer
  • A motor develops 80 kW of power as it lifts a loaded elevator 20.5 m in 45 s. How much force does the motor exert? *
    11·1 answer
  • Please help as quick as possible
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!