Which of the following consists entirely of vector quantities?
Velocity, magnetic fulx and reaction
Tension, magnetic flux and mass
Displacement, impulse and power
Work, pressure and moment
Correct answer is A
No explanation has been provided for this answer.
The efficiency of a machine is always less than 100% because the
work output is always greater than the work input
load lifted is always greater than the effort applied
effort applied is always greater than the load lifted
velocity ratio is always greater than the mechanical advantage
Correct answer is D
No explanation has been provided for this answer.
I, II, III and IV
III and IV only
I, II and III only
I and II only
Correct answer is B
A person can weigh differently at various place on Earth because of the fluctuations in Earth's gravity,
because the planet is not perfectly spherical or uniformly dense and its rotation.
The resultant of two forces acting on an object is maximum if the angle between them is
45°
0°
90°
180°
Correct answer is B
The resultant of two forces acting on an object is maximum when the angle between them is zero, during which the tow forces are parallel and pointing in the same direction
12cm
1cm
3cm
6cm
Correct answer is D
If the bob is fully immersed in the water, then the volume of water displaced will be equal to the volume of the bob = 4/3πr3, where r is the radius of the bob.
This volume of water in the cylinder = πr2l, where r = radius of the cylinder, and l = level of water rose in the cylinder.
Therefore, π x r2 x l = 4/3 x π x 33
Then r2 = 36
r = √36
r = 6cm