Explanation:
u = 0m/s
v = 30m/s
a = 2m/s²
Using Kinematics, we have v = u + at.
Therefore t = (v - u) / a
= (30 - 0) / (2) = 15 seconds. (B)
Answer:
A) 1.2
B) 1.1
Explanation:
A)
F = force required to start the box moving = 36.0 N
m = mass of the box = 3 kg
= weight of the box = mg = 3 x 9.8 = 29.4 N
= normal force acting on the box by the floor
normal force acting on the box by the floor is given as
= = 29.4
= Static frictional force = F = 36.0 N
= Coefficient of static friction
Static frictional force is given as
=
36.0 = (29.4)
= 1.2
B)
a = acceleration of the box = 0.54 m/s²
F = force applied = 36.0 N
= kinetic frictional force
= Coefficient of kinetic friction
force equation for the motion of the box is given as
F - = ma
36.0 - = (3) (0.54)
= 34.38 N
Coefficient of kinetic friction is given as
= 1.1
Both of them are substances which comes between the path of electricity but the difference is that one let the electricity to pass that is conductor and other acts as breaker in the connection which is a insulator.
Explanation:
Speed = 12 m/s ⇒ 43.2 km/h
Time = 10 hour
Speed = Distance/Time
43.2 = Distance/10
Distance = 43.2 x 10
Distance = 432 kilometers
Answer:
5 m/s
Explanation:
As the ball falls to the ground, it is acted upon by a force which is due to the gravitational force. Hence, the ball falls with an acceleration called the acceleration due to gravity.
Let us assume that the acceleration due to gravity (g) = 10 m/s², Since initially, the body was at rest, hence the initial velocity (u) = 0 m/s. The height to the ground (h) = 1.3 m. Hence using the equation of motion, the final velocity (v) is:
v² = u² + 2gh
Substituting:
v² = 0² + 2(10)(1.3)
v² = 26
v = √26 = 5
v = 5 m/s