Answer:
the time taken for crossing the boat is 18.67 seconds
Explanation:
The computation of the time taken for crossing the boat is shown below:
But before that we do the following calculations
=
= √12.25 - √1.21
= √11.04
= 3.32
Now the time taken for crossing the boat is
= 62 ÷ 3.32
= 18.67 seconds
Hence, the time taken for crossing the boat is 18.67 seconds
And, the same is to be considered
Answer:
(d) a net external force must be acting on the system
Explanation:
Momentum is given as the product of mass and velocity.
P = MV
According to Newton's second law of motion, " Force applied to a body (system) is directly proportional to the rate of change of momentum of the body (system) which takes place in the direction of the applied force (external force).
F ∝ΔMV
Therefore, If the total momentum of a system is changing, a net external force must be acting on the system.
(d) a net external force must be acting on the system
The formula for kinetic energy is,
where m is mass and v is velocity.
Let's plug the given values in the formula.
It's kinetic energy is 64 Joules.
Answer:
I = 0.287 MR²
Explanation:
given,
height of the object = 3.5 m
initial velocity = 0 m/s
final velocity = 7.3 m/s
moment of inertia = ?
Using total conservation of mechanical energy
change in potential energy will be equal to change in KE (rotational) and KE(transnational)
PE = KE(transnational) + KE (rotational)
v = r ω
I = 0.287 MR²