The effort required to lift a load W on a screw jack with helix angle – McqOptions

MCQOPTIONS

1.	The effort required to lift a load W on a screw jack with helix angle a and angle of friction
A.	Wtan(a + <)>)
B.	Wtan(a-<)>)
C.	Wcos(a + <t>)
D.	Wsin(a + <(>)
Answer» B. Wtan(a-<)>)

Discussion

No Comment Found

Related MCQs

The moment of inertia of a square of side a about its base is a4/ 3.
The unit of mass moment of inertia in S.I. units is kg-m2.
The above figure shows the three coplaner forces P, Q and R acting at a point O. If these forces are in equilibrium, then
Onejoule is equal to
The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad / s2, is
The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)
A block ot mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will __________ with the increase in coefficient of friction.
The above figure shows the two equal forces at right angles acting at a point. The value of force R acting along their bisector and in opposite direction is
A lift moves downwards with an acceleration of 9.8 m/s2. The pressure exerted by a man on the floor of the lift is zero.
A newton is defined as the force while acting upon a mass of one kg, produces an acceleration of 1 m / s2 in the direction of which it acts.