Electromagnetic waves from a source were found to be significantly diffracted when passing through gaps of the order of 10 m. What type of waves are they likely to be?
The mass of a body measured by a physical balance in a lift at rest is found to be m.If the lift is going up with an acceleration a,its mass will be measured as:
Five equal forces of 10N each are applied at one point and all are lying in one plane.If the angles between them are equal,the resultant force will be:
A progressive sound wave is a means of transferring energy. A progressive sound waveof constant frequency is generated in air. The intensity of energy transfer is directlyproportional to another of the wave parameters. Which of the following is correct?
The high-tensile steel used to support the roadway of a suspension bridge breaks under a stress of 2 x 109Pa. Find the minimum cross-sectional area for a cable if it is to support a load of mass 2 x 105kg.
A non-uniform beam of weight 50 N is 2 m long and is supported on a pivot situated in the exact middle of the beam. The centre of gravity of the beam is 0.5 m ot the right of the point where the pivot touches the beam. What weight has to be added to the left side of the beam so that the beam stays perfectly balanced (in equilibrium)?
A steel wire 12 mm in diameter is fastened to a log and them pulled by a tractor. The length of stire between the log and tractor is 11 m. The force of 10,000 N is required to pull the log. What is stress
A bullet of mass 10 g hits a target and penetrates 2 cm into it.If the average friction offered by the target is 100 N,then the velocity with which the bullet hits the target is
When an observer moves towards a stationary source with a speed equal to 1/5 timesof speed of sound,
the percentage increase in the frequency of sound is:
The conversion of molecules of A to B follows a second order kineties. Doubling the concentration of A will inerease the rate of formation of B by a factor of
