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
