Answer:
(A) 0.625 m /sec
(B) 0 m /sec
(C) 0.692 m /sec
(d) 0.692 m /sec
Explanation:
We have given that a runner covers one lap of track which is 40 m in length in 64 sec
(a) Average speed will be equal to ratio of distance traveled and time taken
So average speed
(B) Average velocity is the ratio of displacement and time taken
As he completed one lap means comes to his initial position
So displacement will be zero
So average velocity
(C) Here time is 28.9 sec for half lap
So average speed
(D) For half lap displacement will be equal to distance traveled
So average velocity will be equal to v=\frac{s}{t}=\frac{20}{28.9}=0.6920m/sec
Answer:
Pi(3.14) radians or 180º degrees
Explanation:
First of all, we need to obtain the wavelength of a wave traveling to the speed of sound and 420 Hz of frequency.
The formula is:
where l = wavelength in meters
With current values:
l = 336 [m/s]/420[1/s] = 0.8 meters
Since a complete cycle (360º or 2pi radians) needs 0.8 meters to complete, 0.4 meters or 40 cm is just half of it, making a 180º degree phase or 3.14 radians.
Answer:
Double helix
Explanation:
The Double helix is a DNA molecule. The two strands around the Double Helix is called the twisted ladder.
Answer:
See answer
Explanation:
The area of the circular loop is given by:
The magnetic flux is given by:
is parallel to and is constant in magnitude and direction therefore:
Part A)
initially the flux is
after the interval
the flux is
now, the EMF is defined as:
,
if we consider very small then we can re-write it as:
then:
Part B)
When looked down from above, the current flows counter clockwise, according to the right hand rule, if you place your thumb upwards (the direction of the magnetic field) and close your fingers, then the current will flow in the direction of your fingers.