A 20kg mass is to be pulled up a slope inclined at 30°...
A 20kg mass is to be pulled up a slope inclined at 30° to the horizontal. If efficiency of the plane is 75%. The force required to pull the load up the plane is J [g=10ms−2]
87N
73.5N
133.3N
533.2N
Correct answer is C
V. R = \frac{1}{Sinθ}
m = 20kg
V.R = \frac{1}{Sin 30}
= 2
Efficiency = 75%
Load = mg
= 20 x 10 = 200N
Efficiency = \frac{M.A}{V.R} \times 100
75/100 = \frac{M.A}{2}
M .A = \frac{75 \times 2}{100}
M. A = 1.5
Since M. A. = \frac{\text{Load}}{\text{Force}}
Force = \frac{200}{1.5}
= 133.3N
Convex spherical mirrors are preferred to plane mirrors as driving mirrors because ...
Which of the following actions will not increase the sensitivity of a moving coil galvanometer? ...
The distance between a node and its adjacent antinode of a transverse wave is equal to? ...
What is the escape velocity of a satellite launched from the earth’s surface? (Take g as 10ms-...
Radio wave Micro wave Infrared wave P Q R Gamma Ray The table above shows the com...
On which of the following is the operation of a moving coil galvanometer based? ...