In the circuit shown, the current in the 1 resistor is :
1.3 A ,from P to Q
0 A
0.13 A ,from Q to P
0.13 A ,from P to Q
Prevalence of pesticide resistant insects
A person is standing on a truck moving with a constant velocity of 14.7 m/s on a horizontal road. The man throws a ball in such a way that it returns to the truck after the truck has moved 58.8 m. Find the speed and the angle of projection (a) as seen from the truck, (b) as seen from the road.
In a vessel, the gas is at a pressure P. If the mass of all the molecules is halved and their speed is doubled, then the resultant pressure will be:
4P
2P
P
A rod of weight w is supported by two parallel knife edges A and B and is in equilibrium in a horizontal position. The knives are at a distance d from each other. The centre of mass of the rod is at distance x from A. The normal reaction on A is:
The dimension of are :
What is stopping potential in photoelectric effect?
Q 4. 22 and are unit vectors along x- and y- axis respectively. What is the magnitude and direction of the vectors , and ? What are the components of a vector along the directions of and ? [You may use graphical method]
14.22 Show that for a particle in linear SHM the average kinetic energy over a period of oscillation equals the average potential energy over the same period.
15.12) For the wave on a string described in Exercise 15.11, do all the points on the string oscillate with the same (a) frequency, (b) phase, (c) amplitude? Explain your answers. (ii) What is the amplitude of a point 0.375 m away from one end?
3. Draw the perpendicular bisector of XY whose length is 10.3 cm. (a) Take any point P on the bisector drawn. Examine whether PX = PY. (b) If M is the midpoint of XY, what can you say about the lengths MX and XY?
6. Find the ratio of the following : 81 to 108