thanks so much for ur help! really appreicate it. glad there are people like you out there.
but last question, can you explain why it has a negative sign in
Torque = -mgLsinθ?
L = [(1.2*0.6)+(0.8*(0.4/2)]/(1.2+0.8)
= 0.44m?using parallel axis theorem:
I of disk = 1/2MR2 + ML2= 1/2(1.2)(0.2)2 + (1.2)(0.6)2= 0.456?
I of thin rod = 1/3ML2 = 1/3(0.8)(0.4)2= 0.0427?
I total = 0.4987?
I have an exam in 45 minutes so i really need to get this cleared up before that.
cylinder: I = 1/2 mr2
sphere: I = 2/5mr2
is rotational inertia same as moment of inertia?
okay i did some calculations and this is what i got:
sphere: v2=(10/7)*g*h
cylinder: v2=(4/3)*g*h
so the sphere has the greatest velocity and should reach the bottom first?
and now with that, comes...
T = 2∏√(I/mgL)
L represents the distance to the center of mass of the system?
L = [(1.2*(0.4+0.6)/2)+(0.8*(0.4/2)]/(1.2+0.8)
= 0.38m?
using parallel axis theorem:
I = 1/2MR2 + ML2
= (0.5)(1.2)(0.2)2 + 0.8(0.2+0.4)2
=0.312?
cylinder: I = 1/2 mr2
sphere: I = 2/5mr2
is rotational inertia same as moment of inertia?
okay i did some calculations and this is what i got:
sphere: v2=(10/7)*g*h
cylinder: v2=(4/3)*g*h
so the sphere has the greatest velocity and should reach the bottom first?
and now with...
Homework Statement
The pendulum shown below right consists of a uniform disk with radius r = 20.0 cm and mass m = 1.2 kg attached to a uniform rod with length L = 40 cm and mass M = 0.8 kg. What is the period of the motion?
Homework Equations
T = 2∏√(I/mgL)
The Attempt at a...
Homework Statement
A sphere and a cylinder of equal mass and radius are simultaneously released from rest on the same inclined plane and roll without sliding down the incline. Then:
A. the sphere reaches the bottom first because it has the greater inertia
B. the cylinder reaches the bottom...
so is the answer for #2 wrong? answer says that it decreases internal energy.
and mu prof just replied to my email, and he said that the ans for both ques is that internal energy decreases in both cases? now I am really confused... but your answer makes so much sense.
the new kinetic energy...
Umm no i don't know what internal energy is, can you please explain?
I just did 1/2(5)(1502-2002) = -43750J
but why is the answer positive?
the energy turns into heat? but does it go into the surroundings?
and why is this answer negative and not positive?
ummmm i can't think of it :S
work =...
Homework Statement A 5-kg projectile is fired over level ground with a velocity of 200m/s at an angle
of 25◦ above the horizontal. Just before it hits the ground its speed is 150m/s.
Over the entire trip the change in the internal energy of the projectile and air is:
A. +19, 000 J
B. −19, 000 J...
A 5-kg projectile is fired over level ground with a velocity of 200m/s at an angle
of 25◦ above the horizontal. Just before it hits the ground its speed is 150m/s.
Over the entire trip the change in the internal energy of the projectile and air is:
A. +19, 000 J
B. −19, 000 J
C. +44, 000 J...
As shown, block 1 has mass m1=460 g, block 2 has mass m2=500 g, andthe pulley which is mounted on a horizontal axle with negligible friction has mass M = 92kg and radius R=5.00 cm. The moment of inertia of the pulley is I = 1/2MR^2. When released from rest,block 2 falls 75.0 cm in 5.00 s...