Answer:
The tea will generally stop cooling when it reaches room temperature ️
Answer:
a) q = 6.27 10⁻¹⁹ C
, b) 4 electron
Explanation:
a) In this configuration of the Mullikan experiment, the sum of the forces is zero, let's use the equilibrium law of / newton
- W = 0
q E = mg
q = mg / E
Let's calculate
q = 1.1 10⁻¹⁴ 9.8 / 1.72 10⁵
q = 6.27 10⁻¹⁹ C
b) Millikan found that the minimum charge that can exist is
q₀ = 1.6 10⁻¹⁹ C
So all charge are an integer multiple of this minimum value.
q = n q₀
n = q / q₀
n = 6.27 10⁻¹⁹ / 1.6 10⁻¹⁹
n = 3.92 = 4
In our drop we have 4 electrons
I am pretty sure that infrared waves are part of the electromagnet spectrum produces heat and with special equipment can locate people at night. I choose this options because <span>gamma rays can be harmful to people, and other options just make no sense.</span>
Answer:
Explanation:
Remark
At the time it takes to drop 20 m is the same time it takes to travel 60 m horizontally.
Givens
h = 20 m
hd = 60 m
g = 9.81
vi = 0
Formula
d = vi*t + 1/2 a * t^2 We are solving for t
Solution
When the battery fails, the vertical initial velocity is 0. So we have to find the time it would take to drop 20 meters
d = 0*t + 1/2 * 9.81 a* t^2
20 = 4.91 * t^2 Divide by 4.91
20/4.91 = 4.91 t^2 / 4.91
4.073 = t^2 Take the square root of both sides.
t = 2.02 seconds
Horizontal
d = 60 m
t = 2.02 seconds
v = ?
Note: there is no horizontal deceleration or acceleration
v = d/t
v = 60/2.02
Answer: v = 29.73 m/s
Answer:
the capacitive reactance is reduced by a factor 2
Explanation:
The capacitive reactance is given by:
where
f is the frequency of the source
C is the capacitance
In this case, the frequency of the source is doubled:
f' = 2f
while the capacitance does not change. So the new capacitive reactance will be
so the capacitive reactance is reduced by a factor 2.