# phy

Review. An object with a mass of m 5 5.10 kg is
attached to the free end of a light string wrapped around
a reel of radius R 5 0.250 m and mass M 5 3.00 kg. The
reel is a solid disk, free to rotate in a vertical plane about
the horizontal axis passing through its center as shown in
Figure P10.51. The suspended object is released from rest
6.00 m above the floor. Determine (a) the tension in the
string, (b) the acceleration of the object, and (c) the speed
to part (c) by using the isolated system (energy) model.

1. 👍
2. 👎
3. 👁
1. Look at energy.

Intial gravational energy=mass*g*h

rotaltional energy=1/2 I w^2=1/2 I(v/r)^2
(look up the moment of inertia for a solid disk I)

rotational energy+1/2 mv^2=Initial GPE
solve for v when it hits the floor (c) this will verify the following.

a) net force=torque=momentI*angularacceleration
= I*tangential acceleration/r=I*a/r

and net force=mg-ma

mg-ma=I a/r solve for a, (b), then solve for tension (mg-ma)

Now
a)

1. 👍
2. 👎
👤
bobpursley
2. wr2

1. 👍
2. 👎

## Similar Questions

1. ### physics

On planet x, an object weighs 10.4N. On planet B where the magnitude of the free fall acceleration is 1.48g (where g=9.8 m/s^2 is the gravitational acceleration on Earth),the object weighs 24.6N. The acceleration of gravity is 9.8

2. ### physics

An object with mass 3.0 kg is attached to a spring with spring stiffness constant k = 300 N/m and is executing simple harmonic motion. When the object is 0.020 m from its equilibrium position, it is moving with a speed of 0.55

3. ### physics

An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. The maximum displacement from equilibrium is A and the total mechanical energy of the system is E. What is the object's velocity

4. ### physical science 2

the force required to maintain an object at a constant velocity in free space is equal to: b: the mass of the object. c: the force required to stop it. d zero

1. ### physics

A 0.40kg object is attached to a spring constant 160N/m so that the object is allowed to move on a horizontal frictionless surface. The object is released from rest when the sprin g is compressed 0.15m find: a) the force on the

2. ### Physics Fluids

When a crown of mass 14.7 kg is submerged in water, an accurate scale reads only 13.4 kg. Is the crown made of real gold? Ok How do I do this problem I set up my free body diagram Net Force = ma = 0= Ft + Fb - Fg were Ft is the

3. ### PHYSICS

A wheel in the shape of a uniform disk of radius R and mass mp is mounted on a frictionless horizontal axis. The wheel has moment of inertia about the center of mass Icm=(1/2)mpR2 . A massless cord is wrapped around the wheel and

4. ### physics

An object is attached to the lower end of a 100-coil spring that is hanging from the ceiling. The spring stretches by 0.210 m. The spring is then cut into two identical springs of 50 coils each. As the drawing shows, each spring

1. ### Physics

"Two springs are hooked together and one end is attached to a ceiling. Spring A has a spring constant of 25N/m, and spring B has a spring constant of 60N/m. A mass weighing 40.0N is attached to the free end of the spring system to

2. ### PHYSICS

A spring is hung from a ceiling, and an object attached to its lower end stretches the spring by a distance d = 7.70 cm from its unstretched position when the system is in equilibrium as in the figure below. If the spring constant

3. ### Physics

A wheel of radius 6cm is mounted so as to rotate about a horizontal axis through its centre. A string of negligible mass wrapped round its circumference carries a mass of 200g attached to its free end. When allowed to fall, the

4. ### Physics

1. Which is NOT true about the variables in the relationship F = ma? Acceleration is directly proportional to mass. Force is directly proportional to mass. Force is directly proportional to acceleration. Acceleration will double