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
Artyom0805 [142]
3 years ago
9

CN you help me with this question?

Physics
1 answer:
nata0808 [166]3 years ago
5 0
That period of time is called the "half-life" of that particular isotope,
because that's how long it takes for ONE-HALF of it to decay and
turn into some other substance.

So, however much you start out with, you can expect that after one
half-life of time has passed, half of the total amount (50%) has decayed
and turned into other substances, and the other half (50%) remains.
You might be interested in
An atom with 9 protons, 11 electrons, and 10 neutrons has a net charge of
LiRa [457]
You find net charge by subtracting the number of electrons from the number of protons (since protons are positive and electrons are negative). 9 - 10 = -1
5 0
3 years ago
A motor has an armature resistance of 3.75 Ω . Part A If it draws 9.10 A when running at full speed and connected to a 120-V lin
bulgar [2K]

Back emf is 85.9 V.

<u>Explanation:</u>

Given-

Resistance, R = 3.75Ω

Current, I = 9.1 A

Supply Voltage, V = 120 V

Back emf = ?

Assumption - There is no effects of inductance.

A motor will have a back emf that opposes the supply voltage, as the motor speeds up the back emf increases and has the effect that the difference between the supply voltage and the back emf is what causes the current to flow through the armature resistance.

So if 9.1 A flows through the resistance of 3.75Ω then by Ohms law,

The voltage across the resistance would be

v = I x R

  = 9.1 x 3.75

  = 34.125 volts

We know,

supply voltage = back emf + voltage across the resistance

By plugging in the values,

120 V = back emf + 34.125 V

Back emf = 120 - 34.125

                = 85.9 Volts

Therefore, back emf is 85.9 V.

4 0
3 years ago
To determine the amplitude of a wave, you would need to know the . A) distance from the crest to the trough. B) maximum displace
Alexxx [7]
To determine the amplitude of a wave, you would need to know the : B. Maximum displacement of the wave from the equilibrium position

You can find out the displacement by counting the waves that is
written on the Graph

Hope this helps

4 0
3 years ago
Read 2 more answers
Describe the energy changes that place when the spring of a toy car is wound up and then released
alex41 [277]
Potential energy to kinetic energy
6 0
3 years ago
Which of these surfaces gives unpolarized reflected light?
scoray [572]

The answer is Metal I'm 100% positive

4 0
3 years ago
Read 2 more answers
Other questions:
  • The interior space of large box is kept at 30 C. The walls of the box are 3 m high and have a ‘sandwich’ construction consisting
    15·1 answer
  • Give three practical uses of electromagnets
    9·1 answer
  • Convert 2536 mm/min to m/s. Use dimensional analysis.
    14·1 answer
  • Astronomers have recently observed stars orbiting at very high speeds around an unknown object near the center of our galaxy. Fo
    14·1 answer
  • What is the speed of a wave that has a frequency of 2,400 Hz and a wavelength of 0.75
    14·1 answer
  • Choose the correct statement concerning units of power or energy. a. A kilojoule (kJ) is a unit of power. b. A gigawatt (GW) is
    7·1 answer
  • HURRY
    9·2 answers
  • . A blowing ball with a 12 cm radius has an initial angular velocity of 5.0 rad/s. Sometime later, after rotating through 5.5 ra
    11·1 answer
  • Select all of the characteristics associated with freshwater ponds. (Click multiple answers)
    13·1 answer
  • Benjamin, a transport technician, was punched by a patient in the
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!