Answer:
Explanation:
Energy stored in a capacitor is given by the expression
E = Q² / 2C , where Q is charge on it and C is its capacitance . As we put dielectric slab between the plates , capacitance increases , Due to it energy decreases as capacitance form the denominator in the formula above and Q is constant .
Hence energy decreases.
Answer:
16.5 m
Explanation:
Given,
Magnetic field = 0.02 T
radius of electron = 9 mm
speed of electron = speed of proton
radius of proton = ?
We know,
.........(1)
using newton second law
equating Force due to electron and proton
m_ e = 9.1 x 10⁻³¹ Kg and m_p = 1.67 x 10⁻²⁷ Kg
Hence, the radius of proton is equal to 16.5 m.
A scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of the phenomenon is called a scientific theory. It is misconception that theories turn into laws with enough research.
A. The formula for mean free time is:
t = V/(4π√2 r²vN)
where
N = 1×10¹⁶ molecules (per m³)
V = 1 m³
r = 111×10⁻⁷m (atomic radius of silicon)
Let's solve for v first:
v = √(3RT/M) = √(3(8.314 m³·Pa/mol·K)(25 + 273 K)/28.1 g/mol Si)
v = 16.26 m/s
t = (1 m³)/(4π√2 (111×10⁻⁷m)²(16.26 m/s)(1×10¹⁶ molecules))
<em>t = 2.81×10⁻9 s</em>
<em>Pure silicon has a high resistivity relative to copper because copper is a conductor, while silicon is a semi-conductor. </em>
Answer:
maximum work is done in the case
D) Clark pushed a crate from the chair, 16 meters across the room, doing 144 J of work.
Explanation:
As we know that the Work done is product of force and displacement
So we have
A) Steve put in 50 J of work moving a box 50 meters.
So here we have
50 = F . 50
F = 1 N
B) Doing 400 J of work, Penny pushed her cat 80 meters.
So here we have
400 = F . 80
F = 5 N
C) Samantha did 365 J of work dragging a wagon across 73 meters of lawn.
So here we have
365 = F . 73
F = 5 N
D) Clark pushed a crate from the chair, 16 meters across the room, doing 144 J of work.
So here we have
144 = F . 16
F = 9 N
So maximum work is done in the case
D) Clark pushed a crate from the chair, 16 meters across the room, doing 144 J of work.