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
Anastaziya [24]
2 years ago
15

The astronaut then measures the abundance of silicon on the new planet, obtaining the following results: Isotope Abundance. (%)M

ass. (amu). 28Si73.7127.98. 29Si14.9328.98. 30Si11.3629.97. What is the atomic mass of silicon for this planet?
Physics
1 answer:
tekilochka [14]2 years ago
5 0
<span>In order to calculate an average, we should sum all numbers and divide them by quantity. Let’s work with qualifications first. Let’s say you got a 10 in 1 exam, then an 8 in 2 exams and a 4 in 2 exams. Your average will be: = (10*1+8*2+4*2) / 5 = 6.8 If 6 is the minimum, you will pass. There is another way to calculate this average: applying distributive property. = 10*1/5+8*2/5+4*2/5 = 6.8 Remember you can convert the fractions into equivalent fractions: 1/5 = 20/100; 2/5 = 40/100 = 10*20/100+8*20/100+4*20/100 = 6.8 We actually don’t have the number of atoms of each mass… we have the percentage instead! So we need to learn this last method for atoms. Let’s go back to our atoms problem: 73.71 % of atoms have a mass of 27.98 u 14.93 % of atoms have a mass of 28.98 u 11.36 % of atoms have a mass of 29.97 u So let’s put that in the formula: Average mass = 27.98 u*73.71 /100 + 28.98 u*14.93 /100 + 29.97u*11.36 /100 So what you have to know is that a percentage can be converted into a fraction, and you should work that fraction in order to find the average. We can make the calculus shorter putting 100 as the common denominator: Average mass = (27.98 u*73.71 + 28.98 u*14.93 + 29.97u*11.36)/100 So actually we are taking the percentage as if it was the quantity, and 100 as if it was the total (the total of all percentages is always 100). Maybe we don’t have 100 atoms, but it will be the same proportion anyway, whatever number we have! And here it is the result: Average mass = 28,36u </span>
You might be interested in
Sound waves are classified as which type of wave?answer
iren [92.7K]
The answer is D. I hope this helps
4 0
2 years ago
Calculate the amount of energy transferred when a 40w light bulb is left on for 30 minutes.
Alinara [238K]

Answer:

E=72000J or 72kj

Explanation:

The formula is E=pt you need to convert your t from minutes to seconds before proceeding

3 0
3 years ago
Which labels best complete the diagram?
nlexa [21]

Answer: D

Explanation: Look at the figure, we can conclude that the correct answer is

X: Low potential energy

Y: High potential energy

Z: Flow of electrons

Because electrons flow where there is difference in potential energy. And electrons move from a region of high potential energy to a region of low potential energy.

Since the arrow is pointing to X, that means

Z is the flow of electrons, X is of low potential energy and Y is of high potential energy.

6 0
3 years ago
5. Sarah is standing 32.0 m away from Jason. If Sarah throws a snowball at a 45 degree
padilas [110]

Answer:

Explanation:

If air resistance is ignored and assume UP and Toward Jason are the positive directions.

horizontal analysis

d = (vx₀)t

t = d/vx₀

horizontal analysis

0 = vy₀t + ½gt²

0 = vy₀(d/vx₀)+ ½g(d/vx₀)²

as vy₀ = v₀sin45 and vx₀ = v₀cos45 and are equal.

0 = d + ½g(d²/v₀²cos²45)

-d = ½g(d²/v₀²cos²45)

-dv₀² = ½g(d²/cos²45)

   v₀² = -½g(d/cos²45)

   v₀² = -½(-9.81(32.0/cos²45)

   v₀² = 313.92

   v₀ = 17.717787...

   v₀ = 17.7 m/s

7 0
2 years ago
A 0.106-A current is charging a capacitor that has square plates 4.60 cm on each side. The plate separation is 4.00 mm.
nikdorinn [45]

Answer:

a

 \frac{d \phi_{E}}{dt}  =1.1977 *10^{10} \  V\cdot m/s

b

 I = 0.106 \  A

Explanation:

From the question we are told that

  The current is  I =  0.106 \  A

   The length of one side of the square a = 4.60 \  cm = 0.046 \  m

    The separation between the plate is  d = 4.0 mm  = 0.004 \ m

Generally electric flux is mathematically represented as

       \phi_E = \frac{Q}{\epsilon_o}

differentiating both sides with respect to t is  

       \frac{d \phi_{E}}{dt}  = \frac{1}{\epsilon_o} * \frac{d Q}{ dt}

=>     \frac{d \phi_{E}}{dt}  = \frac{1}{\epsilon_o} *I

Here \epsilon_o is the permitivity of free space with value  

        \epsilon _o  =  8.85*10^{-12} C/(V \cdot m)

=>   \frac{d \phi_{E}}{dt}  = \frac{0.106}{8.85*10^{-12}}

=>   \frac{d \phi_{E}}{dt}  =1.1977 *10^{10} \  V\cdot m/s

Generally the displacement current between the plates in A

    I = 8.85*10^{-12} * 1.1977 *10^{10}

=>  I = 0.106 \  A

 

3 0
2 years ago
Other questions:
  • Which of the following confirms that gravitational mass and inertial mass are equivalent?
    11·1 answer
  • In which direction does a Newton's Third Law reaction force act?
    7·1 answer
  • What could people do to DECREASE erosion of the Earth’s surface? A) Cut down more trees. B) Use more land to plant crops. C) All
    12·2 answers
  • What are different type of plastids explain them?​
    10·1 answer
  • 2.
    15·1 answer
  • Automobile A and B are initially 30 m apart travelling in adjacent highway lanes at speeds VA = 14.4 km/hr., VB 23.4 km/hr. at t
    9·1 answer
  • Mark all the units for speed
    7·1 answer
  • On a velocity vs. time graph, what does it mean when the line crosses over the x-axis?
    6·1 answer
  • How many minutes will it take a car to go from a stop to 33 km/hr if it accelerates at 10 km/hr²
    6·2 answers
  • What do the top of a zip line and the top of a bungee cord have in common
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!