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Lana71 [14]
4 years ago
7

What are the basic properties of matter

Physics
2 answers:
Nonamiya [84]4 years ago
8 0
Water
Air
Heat
Magnetism
Solar power
aniked [119]4 years ago
7 0
Solid liquid gas are the main ones, there's also plasma
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1. Two magnets are placed on a table, and they immediately move to attach to each other. Which statement is correct about the en
erma4kov [3.2K]

Answer: 1: kinetic energy and velocity are at zero when the magnets are held apart, and both increases rapidly when they are released and move together. Energy stored in the magnetic field decreases.

2: The energy stored in the system is converted to kinetic, thermal, and sound energy.

3: The energy stored in the magnetic field does not change.

4: Some of the energy stored is converted into kinetic and thermal energy.

5: Two small repelling magnets hold each other in place.

Just took the quiz all are correct! I hope this helps you! :)

3 0
3 years ago
The count rate of a radioactive source decreases from 1600 counts per minute to 400 counts per minute in 12 hours. What is the h
kirill115 [55]

Answer:

t_{1/2}=6 h

Explanation:

Let's use the decay equation.

A=A_{0}e^{-\lambda t}

Where:

  • A is the activity at t time
  • A₀ is the initial activity
  • λ is the decay constant

We know that \lambda=\frac{ln(2)}{t_{1/2}}

So we have:

\lambda=\frac{ln(A/A_{0})}{t}

\frac{ln(2)}{t_{1/2}}=\frac{ln(A/A_{0})}{t}

t_{1/2}=\frac{t*ln(2)}{ln(A/A_{0})}

t_{1/2}=6 h

Therefore, the half-life of the source is 6 hours.

I hope it helps you!

4 0
3 years ago
Calculate the inductance of a solenoid that is 1.7 cm long and 3.3 mm in diameter, with 195 turns of wire.
jeka57 [31]
The answer is 
3.37e-2 

5 0
3 years ago
A star has a surface temperature of 30,000 K. At what wavelength does the peak radiation occur? 100 nm
tangare [24]
Use the displacement law, peak wavelength = 0.0029/T =0.0029/30000 = 97nm
8 0
4 years ago
Read 2 more answers
if the current in a wire is 2.0 amperes and the potential difference across the wire is 10 volts what is the resistance of the w
Pavlova-9 [17]

Answer:

R = 2Ω

Explanation:

Potential difference (V) = current (I) * Resistance (R)

V = IR

I = 2.0A

V = 10v

R = ?

V = IR

R = V / I

R = 10 / 2

R = 2Ω

The resistance across the wire is 2Ω

3 0
3 years ago
Read 2 more answers
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