Answer:
The correct option is D
Explanation:
From the question we are told that
The speed of the first charge is
This is because it is at rest
The speed of the second charge is
Generally the force exerted by a magnetic field on a charge is mathematically represented as
Now looking at this above equation we can see that can only be maximum at and this only obtained when the direction of the charge (i.e its velocity ) is perpendicular to the direction of the magnetic field
so the correct option for this question is D
Answer:
v2 = 12m/s
Explanation:
To find the velocity of water in the lower tube you use the following formula:
(1)
v1: velocity in the first tube
v2: velocity in the second tube
A1: area of the first tube
A2: area of the second tube
From the expression (1) you can obtain the velocity v2, that is the velocity of water in the second tube:
you replace the values of the parameter in order to calculate v2:
hence, the velocity of the water is 12m/s
Answer:
67.8 m.
Explanation:
For 0.3 sec which is the response time , he will keep on moving with velocity
undiminished or at 26 m/s .
Distance travelled during this period
= 26 x .3 =7.8 m
For rest of the time ie during 4 - .3 = 3.7 s , he decelerates with deceleration of 5.3 ms⁻² and initial velocity of 26 m/s
s = u t - 1/2 a t²
s = 26 x 3.7 - .5 x 5.3 x 3.7 x 3.7
= 96.2 - 36.28
= 60 m approx.
Total distance travelled
=60 + 7.8 = 67.8 m.
C.
The average kinetic energy of the particles in a substance is called temperature
The greater the average kinetic energy of the particles in the substance, the higher the temperature