Search & Filtering
On a day that the temperature is 28.0oC, a concrete wall is poured in such a way that the ends of the wall are unable to move. Take Young’s modulus for concrete to be 4.57 x 109 N/m2 and the compressive strength to be 1.32 x 106 N/m2. (a) What is the stress in the cement on a hot day of 43.0oC? (b) Does the concrete fracture? (Take = 1.2 x 10-5 oC-1).
assuming that the resolving power of the eye is determined by diffraction effects only, calculate the maximum distance at which two objects separated by a distance of 2 m can be resolved by the eye. (assume pupil diameter to be 2 mm and λ = 6000 å.)
How many electrons have removed from a positively charged particles if it has a net charge of 5X10-9C?
A test charge produced an electric field, E, at point 3 m away from the charge, The point where the field is half its original values is located at?
Two identical drops of water with radius 0.2cm join together to for a big drop.Calculate the loss or gain in surface energy during the process (surface tension of water=0.72Nm-¹)?
The distance S in meters covered by a particle at time t seconds is given by
S=2t³-3t²-5t.Find
i) It's speed in the 5th second
ii) It's distance in the 3rd second
iii) The time the particle is momentarily at rest
iv) The acceleration at t=5s?
A particle perform simple harmonic motion in a straight line about a center C in the line.When it's distances from C are 5.0 and 13.0cm,it's velocities are 25.0 and 7.0cm/s respectively.Find the period and the amplitude of the oscillation.
Hint: use V=±w(angular velocity)√(A² - y²)
and solve simultaneously.?
An object is projected with a velocity U at an angle R to the horizontal.It just clears two walls of equal height b and at a distance of b apart.
Show that 2U cosR√(U² sin²R - 2bg) = bg?
A flat rectangle is placed in a uniform electric field with a magnitude of 7.8 x 103 N/C. The electric flux through the rectangle when its face is 45º to the field lines is 89.75 Nm2/C. Find the width of the flat rectangle with a length of 9. 45cm.
The resonant frequency f of a closed air column is known to depend on the pressure p and the density, of the air and the length, L of the air column. How are these quantities related
