9s
4.5s
6s
7.5s
3s
Correct answer is E
Using the equation of motion
S = ut + 12at2
45 = (0 x t) + (12 x 10 x t2)
t = 3s
The frictional force between two bodies?
exists only when there is relative motion or tendency for motion
acts so as to oppose the motion
depends on the normal reaction between the two surfaces
is relatively independent of the area in contact
has all of these characteristics
Correct answer is E
Frictional force is the opposing force that is created between two surfaces that try to move in the same direction or that try to move in opposite directions.
The main purpose of a frictional force is to create resistance to the motion of one surface over the other surface.
A man walks 1km due east and then 1km due north. His displacement is
1 km N15oE
1 km N30oE
√2km N 45oE
√2km N 60oE
2km N 75oE
Correct answer is C
R = √12+12 = √2km
θ = tan-1 (1)1 = 45oC
= √2km N 45oE
Which of the following statements is correct? Silvered walls of a vacuum flask are used to prevent
heat loss due to conduction
vacuum loss
heat entry into the inner flask due to convection
heat loss due to radiation
heat loss due to convection
Correct answer is D
No explanation has been provided for this answer.