1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

In the given figure, pulley is massless and a force F=10t is applied on it. Here, t is time. [g=10 m/s2]

A
Time when 4 kg leaves the ground is 8 sec.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
At t = 3 sec, speed of 2 kg is 4 m/s.
No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
C
Power of tension force on 2 kg when 4 kg leaves ground is 800 Watt.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Speed of 2 kg when 4 kg leaves ground is 20 m/s.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct options are A Time when 4 kg leaves the ground is 8 sec. C Power of tension force on 2 kg when 4 kg leaves ground is 800 Watt. D Speed of 2 kg when 4 kg leaves ground is 20 m/s.⇒F=2T⇒10t=2T⇒T=5t To lift 4 kg, T=mg=40N ⇒5t=40,t=8 sec To lift 2 kg, T = 20 N ∴t=4 sec FBD of 2 kg block, For t>4 sec⇒5t−20=2a a=52t−10⇒∫v0dv=∫84(52t−10)dt v=(54t2−10t)84 ⇒v=20 m/s Therefore, power = F×v = =F×v=5t×v=5×8×20=800 W

Suggest Corrections
0
Join BYJU'S Learning Program
Related Videos
Losing Weight Using Physics
PHYSICS
Watch in App
Explore more
Join BYJU'S Learning Program