Answer:A
Explanation:
Given
Skier A takes straight, smooth route while Skier B takes curvy, bumpy route to finish.
We know gravity is conservative in nature i.e. work done against it is independent of path followed
So work done by gravity for A and B is same
According to Work energy Theorem Change in the kinetic Energy is equal to work done by all the forces.
where h=vertical height of hill
thus
which is same for both A and B
Answer:
1000 Nm
2000 Nm
1.00007 seconds
Explanation:
I = Moment of inertia = 5 kgm²
= Angular acceleration
= Final angular velocity
= Initial angular velocity
t = Time taken
Torque is given by
The torque of the disc would be 1000 Nm
If
The torque of the disc would be 2000 Nm
From equation of rotational motion
It would take 1.00007 seconds to reach 3820 rpm
Answer:
The original dimensions of the building is 95 ft × 38 ft.
Explanation:
Let the original length be 'l' and original width be 'w'.
Given:
Original length (l) =
Original width = 'w'.
So,
Now, as per question:
Length and width is increased by 7 ft.
So, new length (l') =
New width (w') =
New perimeter (P) = 266 ft
Perimeter is given as:
Therefore, original width = 38 ft.
Original length is,
Hence, the original dimensions of the building is 95 ft × 38 ft.