Hot questions

0 votes

0 answers

A projectile fired with initial velocity `u` at some angle `theta` has a range `R`. If the initial velocity be doubled at the same angle of projection, then the range will be

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Match the Column I (type of friction) with Column II (value of `mu`) and select the correct option from the codes given below. Column I Column II A. Static friction p. p is highest B. Rolling friction q. p is moderate C. Kinetic friction r. p is lowest

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Can beats be produced in two light sources of nearly equal

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Why the temperature less than absolute zero is not

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Write in about 1000 words a fiction piece based on your speculation on the science and technology of the twenty-second

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

One mole of an ideal gas at standard temperature and pressure occupies 22.4 L (molar volume). What is the ratio of molar volume to the atomic volume of a mole of hydrogen ? (Take the size of hydrogen molecule to be about 1 Å). Why is this ratio so large

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

You measure two quantities as A = 1.0 m ± 0.2 m, B = 2.0 m ± 0.2 m. We should report correct value for `sqrt (AB)`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Assertion: If acceleration of a particle moving in a straight line varies as `a prop t^n` then `s prop t^(n+2)` . Reason: If `a-t` graph is a straight line,then `s-t` graph may be a

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Cavendish’s ExperimentThe figure shows the schematic drawing of Cavendish’s experiment to determine the value of the gravitational constant. The bar AB has two small lead spheres attached at its ends. The bar is suspended from a rigid support by a fine wire.Two large lead spheres are brought close to the small ones but on opposite sides as shown. The value of G from this experiment came to be `6.67 xx 10^(-11) N-m^2'/'kg^2`.The big spheres attract the nearby small ones by a force which

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Explain briefly the analytical method of formation of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

An air chamber of volume V has a neck area of cross section a into which a ball of mass m just fits and can move up and down without any friction (Fig.). Show that when the ball is pressed down a little and released , it executes SHM. Obtain an expression for the time period of oscillations assuming pressure-volume variations of air to be isothermal [see Fig. 14.27].

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

A person is driving a vehicle at a uniform speed of `5 ms^(-1)` on a level curved track of radius `5 m`. The coefficient of static friction between tyres and road is 0.1. Will the person slip while taking the turn with the same speed? (Take, `g=10

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

The shells of crabs found around a particular coastal location in Japan seem mostly to resemble the legendary face of a Samurai. Given below are two explanations of this observed fact. Which of these strikes you as a scientific explanation ? (a) A tragic sea accident several centuries ago drowned a young Samurai. As a tribute to his bravery, nature through its inscrutable ways immortalised his face by imprinting it on the crab shells in that area. (b) After the sea tragedy, fishermen in that area, in a gesture of honour to their dead hero, let free any crab shell

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Explain this common observation clearly : If you look out of the window of a fast moving train, the nearby trees, houses etc. seem to move rapidly in a direction opposite to the train’s motion, but the distant objects (hill tops, the Moon, the stars etc.) seem to be stationary. (In fact, since you are aware that you are moving, these distant objects seem to move with

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

The volume of a liquid flowing out per second of a pipe of length l and radius r is written by a student as `U=(pi Pr^4)/(8ηl)`where P is the pressure difference between the two ends of the pipe and η is coefficient of viscosity of the liquid having dimensional formula ML–1 T–1. Check whether the equation is dimension ally

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Which of the following statement is not

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Names of units of some physical quantities are given in Column I and their dimensional formulae are given in Column II and select the correct option from the codes given below. Column I Column II A. Pa-s P.`[L^2T^(-2)K^(-1)]` B. `Nm-K^(-1)` q.`[MLT^(-2)A^(-1)K^(-1)]` C. `J kg^(-1) K^(-1)` r. `[ML^(-1)T^(-1)]` D. `Wb m^(-1) K^(-1)` s. `[ML^2T^(-2)K^(-1)]`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

A metal rod of length 20cm and diameter 2cm is covered with a non-conducting substance. One of it ends is maintained at `100^oc` while the other is at `0^oc`. It is found that 25g of ice melts in 5 min calculate coefficient of thermal conductivity of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Find the centre of mass of three particles at the vertices of an equilateral triangle. The masses of the particles are 100g, 150g, and 200g respectively. Each side of the equilateral triangle is 0.5m

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

Assertion: In the `s-t` diagram as shown in figure, the body starts moving in positive direction but not from `s= 0`.Reason At `t = t_0`, velocity of body changes its direction of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

Hot questions

Categories