Basic Maths and Units and DimensionsHard
Question
An elevator and its load have a total mass of 800 kg. If the elevator, originally moving downward at 10 m/s, is brought to rest with constant decleration in a distance of 25 m the tension in the supporting cable will be
(g = 10m/s2) :-
(g = 10m/s2) :-
Options
A.8000 N
B.6500 N
C.11200 N
D.9600 N
Solution
by v2 = u2 - 2as
0 = 102 - 2a × 25
a = 2 m/s2 (Retardation)
For ↓ retardation :
T = m(g + a) = 800(10 + 2) = 9600 N
0 = 102 - 2a × 25
a = 2 m/s2 (Retardation)
For ↓ retardation :
T = m(g + a) = 800(10 + 2) = 9600 N
Create a free account to view solution
View Solution FreeTopic: Basic Maths and Units and Dimensions·Practice all Basic Maths and Units and Dimensions questions
More Basic Maths and Units and Dimensions Questions
A block of mass m is placed on a smooth inclined wedge ABC of inclination θ as shown in the figure. The wedge is gi...Liquid rises to a height of 2cm in a capillary tube. The angle of contact between the solid and the liquid is zero. The ...The molecules of a given mass of a gas have r.m.s velocity of 200 ms-1 at 27oC and 1.0 ×105 Nm-2 pressure. When the...All the rods have same conductance ′K′ and same area of cross section ′A′. If ends A and C are m...Three samples of the same gas A,B and C(γ = 3/2) have initially equal volume. Now the volume of each sample is doub...