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
Alexandra [31]
2 years ago
5

Potassium has an atomic number

Physics
2 answers:
Fantom [35]2 years ago
8 0

Answer:

20 neutron

Explanation:

neutron=atomic mass-atomic no.

=39-19

=20

Lera25 [3.4K]2 years ago
5 0
Answer: C) 20

Detailed Explanation:

No. of Neutrons = Mass No. - Atomic No.

Therefore,
= 39 - 19
=> 20

No. Of Neutrons = 20
You might be interested in
Which of these is not a type of force?
coldgirl [10]
Inertia
the awnswer is inertia b
6 0
3 years ago
Read 2 more answers
I have no clue what to do please help.
Yakvenalex [24]

Answer:

Step one : read the directions

Step two: complete the assignment

Explanation:

3 0
2 years ago
1 kg air in a piston-cylinder assembly is heated at constant pressure, resulting the expansion of the volume. the initial temper
rewona [7]

Answer:

57,42 KJ

Explanation:

By a isobaric proces, the expresion for the works in the jpg adjunt. Then:

W = Pa(Vb - Va) = Pa*Vb - Pa*Va ---(1)

By the ideal gases law: PV=RTn

Then, in (1): (remember Pa = Pb)

W =  R*Tb*n - R*T*an = R*n*(Tb - Ta) --- (2)

Since we have 1 Kg air: How much is this in moles?

From bibliography: 28.96 g/mol

Then, in 1 Kg (1000 g) there are:

n =  34,53 mol

Finally, in (2):

W =  (8,3144 J/K.mol)*(34,53 mol)*(500K - 300K) = 51 419,9 J ≈ 57,42 KJ

4 0
3 years ago
Two forces are acting on a wheelbarrow. One force is pushing to the right and an equal force is pushing to the left. What can yo
andreev551 [17]

-- As far as we know, the forces on the wheelbarrow are balanced.

-- That tells us that the net force on the wheelbarrow is zero, just
as if there were no forces acting on it at all.

-- That tells us that the wheelbarrow's acceleration is zero ... its
speed and direction of motion are not changing.

-- That tells us that the wheelbarrow is moving in a straight line
at a constant speed.  It's very possible that relative to us, the speed
may be zero, but we can't tell that from the given information.

6 0
2 years ago
Nancys airplane trip took 4 hour. For one-fourth of that time, the airplane flew at a speed of 880 km/h, it flew at a speed of 6
9966 [12]
So for a minute lets ignore the 880 km/h. If it took 4 hours and she flew at 600 km/h 600*4=2400. Now lets Look at the 880 bit. If it took 4 hours and she where to fly at 880 it would've been 880*4=3520. Lets do 2400-600=1800, now we've got the 600 kmh bit done. Now lets see if you fly 880 km/h for one hour then you add 1800+880=2680. 

Remember to thank and rate people who help you!
4 0
2 years ago
Other questions:
  • Meteor Infrasound A meteor that explodes in the atmosphere creates infrasound waves that can travel multiple times around the gl
    8·1 answer
  • When a liquid is introduced into the air space between the lens and the plate in a Newton's-rings apparatus, the diameter of the
    15·1 answer
  • An archer fires an arrow, which produces a muffled "thwok" as it hits a target. If the archer hears the "thwok" exactly 1 s afte
    10·1 answer
  • Jupiter's moon Io has active volcanoes (in fact, it is the most volcanically active body in the solar system) that eject materia
    12·1 answer
  • Which vector shows the direction of the centripetal acceleration at this point
    12·1 answer
  • When unbalanced forces act on an object, __________________. the object accelerates friction becomes greater than the net force
    14·1 answer
  • What is the density of a 14.4 g of chromium in a rectangle with a volume of 2 cm3?​
    15·1 answer
  • Explain the reason for following in science. A small stone trapped in your shoe, under your foot, can be very painful.
    10·1 answer
  • A greyhound has a mass of 35 kg and can run at a speed of 20 m/s. What is the kinetic energy that a greyhound can achieve
    10·1 answer
  • Please help me there​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!