PHYSICS Flashcards
5-10 MHz
to monitor blood flow through major arteries through ultrasonic waves
Thermodynamics V=constant
workdone=zero
W=P∆V
max height
H=gT2/8 obligue
K.E and P.E projectile motion
K.E→K.Ecos2⊖
P.E→P.Esin2⊖
direction of impulse and momentum
same at 0°
don’t look at v
v=√2gh
∆h=h1-h2
a boy swing in a sitting position if he stands up the period of the swing will be
as boy stands its center of gravity shifts upward and the length (from the the point where string is attached to the center of gravity of body) decrease
↓T∝√L↓
time period will be shorter
the ratio of K.E at mean to P.E when displacement is half of amplitude
K.E=1/2k(x◦2-x2)
K.Emax=1/2kx◦2
P.E=1/2kx2
=1/2kx◦2/2
4:1a bomb of mass 30kg is at rest explodes into pieces of mass 18kg and 12k. The velocity of 18kg mass is 6ms-1. The K.E of the other mass
Pi=Pf
0=m1v1+m2v2
v2=-9ms-1
K.E=1/2mv2
=486Jmomentum and stopping potential
P=mv
P=mS/t
P∝S
coefficient of a perfectly elastic collision
e = 1
coefficient of a inelastic collision
e = 0
The sphere have a head-on collision
X stick together
V total K.E after mv2
=I/2mv2+1/2m(-v)2
=mv2
V total momentum after collision
=2mv/2=1.4
/3=1.7
/5=2.2
Value of Coulombs constsnt is _______than gravitational constant.
Greater
9x109Nm2C-2
6.67 × 10-11Nm2kg-2
A resister connected to a battery is heated T increase due to current through it
Only no. of free e’s same
R increase or decrease T increase
Even resistivity
Photoelectric effect
Law of conservation of energy
Light energy Electrical energy convert
P=Ft
P=Ft
Charging curve rise btw q and t
Dischaging/decay curve fall C
Frequency of DC is 0
Frequency of AC is 50 Hz
E=oT4
T=3T
E=81E
Magnetic field cross
Current wire produce
Upward movent between magnets
Magnitude of coulomb force ratio= 1:1
Forces ratio= 1:-1
Useful tracer
Carbon 14
Germanium=0.3
Silicon=0.7
F=0
B=0
Angle 0° 180°
Velocity and B same direction
Equal fraction disintegrates in equal interval of time
The rate of disintegration is directly proportional to the no of atoms present at that instant
Equipotential surface
V constant
DelV =0
W =0
Line of force in electric field
Farady
n = p + e + antineutrino r-
1 KWh=1 unit
Lamda s - lamda i
E = N delO / delt
IR = delO / delt
I delt = delO / R
Q = delO / R
Rod connected between two spheres O(charge density)a = Ob qa / Aa = qb / Ab qa / pie ra2 = qb / pie rb2 qa /qb = ra2 / rb2
Va = Vb
qa / qb = ra / rb
V=kZqe/r
P=/2mK.E
Projectile motion
T=2Visino/g
H=Vi2sin2o/2g
R=Vi2sin2o/g
Rtano=4H
Workdone=0
Holding mass
Alpha particles high ionizing
High charge and low speed
Street step down 1100V-220V
What does change when constant force is kept applied on a body
Position
Isotopes in Xe and Cs
36
O=2pielamda/x
A 1000-kg airplane moves in straight flight at constant speed. The force of air friction is 1800 N. What is the net force on the plane?
Zero
The airplane is producing a constant force of 1800N and that’s the reason why the plane is moving with constant speed.
The net force is 1800 - 1800 = 0.
V
electric potential V=kq/r
absolute potential V=W/q
potential difference or voltage V=IR=Ed
rms
always positive
aka effective values
related to amplitude of the instantaneous sinusoidal values
I◦ = /2 Irms
the energy stored in electromagnetic or electrostatic field is called
electric potential energy
