Answer:
You could try finding a familiar peer to join the activity with your child. Or ask your child who their friends are at school, or what they look for in a friend at school.
Answer: Fmax = 5.54*10^-12 N
Explanation: From the question, we have the potential difference (V) =20kv = 20,000v and strength of magnetic field (B) =0.41 T.
The maximum force experienced by a charge of magnitude (q) is given as
Fmax = qvB
Where v = velocity of electron.
The velocity of the electron can be gotten by using the work energy theorem.
The kinetic energy of the electron (mv²/2) equals the work done needed to accelerate it.
mv²/2 = qV.
Where m = mass of an electronic charge = 9.11×10^-31 kg, q = magnitude of an electronic charge = 1.609×10^-19 c, v = velocity of electron, V = potential difference = 20,000v.
By substituting the parameters, we have that
(9.11×10^-31 × v²)/2 = 1.609×10^-19 × 20000
(9.11×10^-31 × v²) = 1.609×10^-19 × 20000 ×2
v² = (1.609×10^-19 × 20000 ×2)/9.11×10^-31
v² = 64.36*10^(-16)/9.11×10^-31
v² = 7.0647×10^15
v = √7.0647×10^15
v = 8.40×10^7 m/s
Fmax = 1.609×10^-19 × 8.40×10^7 × 0.41
Fmax = 5.54*10^-12 N
*heat transfer energy, As it always flow from higher temperature to lower temperature till it reach the thermal equilibrium.
example: -friction.
- collisions.
- the hot cup which's hotter than your hand✋will transfer heat in your hand. and a cold piece of ice which's colder than your hand to causing the heat transfer out of your hand .
*temperature ️ depends on the move of particle and we have a different shape of motion like:
translational motion.
rotational motion.
vibrational motion.
when the temperature:
increases it has more kinetic energy and faster moving particles and the object expanded which known as (thermal expansion).
decreases it has less kinetic energy and slower moving particles.
As kinetic energy is 1/2 mV².
example: -the mercury in thermometers.
*Absolute zero :
The theoretical temperature at which substances possess no thermal energy, equal to 0 K, −273.15°C, or −459.67°F.
*specific heat "c" :
is essentially a measure of how thermally insensitive a substance is to the addition of energy.
c=Q/m∆T
where Q is energy .
note water has a higher specific heat, and lower temperature.
*conduction <em><u>example</u></em> When the stove is turned on, the skillet becomes very hot due to the conduction of heat from the burner to the skillet.
