Web buckling occurs in a beam due to excessive
Direct tensile stress in the web
Bending tensile stress in the web
Torsional shear stress in the web
Compressive stress in the web
A drilling machine of 10kW power is used to drill a bore in a small aluminium block of mass 8kg. If 50% of power is used up in heating the machine itself of lost to the surroundings then how much is the rise in temperature of the block in 2.5 min(given: specific heat of aluminium=0.91 J/g∘C)?
103°C
130°C
105°C
30°C
Two particles are projected simultaneously in the same vertical plane, from the same point, but with different speeds and at different angles to the horizontal. The path followed by one, as seen by the other, till both are in air is
A vertical straight line
A straight line making a constant angle (≠90∘) with the horizontal
A parabola
A hyperbola
The system shown in the figure is in equilibrium at rest and the spring and string are massless. Now the string is cut. The acceleration of masses 2m and m just after the string is cut will be:
3g2 upwards, g downwards
g2 upwards, g downwards
g upwards, 2g downwards
2g upwards, g downwards