Physics Test - ...

A wave equation is given by \(y=4 \sin \left[\pi\left(\frac{t}{5}-\frac{x}{9}+\frac{1}{6}\right)\right]\) where \({ }^{\prime} x^{\prime}\) is in \(\mathrm{cm}\) and \({ }^{\prime} t^{\prime}\) in sec. Which of the following is true?

Two pendulums oscillate with the same amplitude but with a constant phase difference of 90×. If the maximum velocity of one is v, the maximum velocity of the other will be

If the resultant of two forces P and Q acting at an angle `α` is R, inclined at an angle `θ` with P, then cos θ =

The graph below shows the variation of velocity (v) of a body with position (x) from the origin O.

Which of the following graphs correctly represents the variation of acceleration (a) with position (x)?

If each of the two unlike parallel forces P and Q ( P > Q ) acting at a distance d apart be increased by S, then the point of application of the resultant is moved through a distance

An observer moves towards a stationary source of sound with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?

A tube, closed at one end containing air, produces, when excited, the fundamental note of frequency 512 Hz. If the tube is open at both ends, then the fundamental frequency that can be excited will be (in Hz)

The resultant of two forces P N and 3 N is a force of 7 N. If the direction of the 3 N force was reversed, the resultant would be$\sqrt{19}$N. The value of P is

An aircraft executes a horizontal loop at a speed of 720 km h-1with its wings banked at 150. What is radius of loop?

A circuit consists of five identical conductors as shown in figure. The two similar conductors are added as indicated by dotted lines.

The ratio of resistances before and after addition will be: