Question

An axe is brought up to grindstone and brings the grindstone to a halt in 8...

An axe is brought up to grindstone and brings the grindstone to a halt in 8 seconds. How much work is done on the axe? What power was required to bring the grindstone to a halt?

radius of the grindstone=0.4
mass of grindstone=15kg
grindstone originally rotates at 30 rad/s

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A heavy grindstone (mass,50 kg, radius,0.4 m) is spun up with constant torque from rest to...
A heavy grindstone (mass,50 kg, radius,0.4 m) is spun up with constant torque from rest to a final angular velocity of 1 rev/sec. This is accomplished in 15 seconds. a)what is the rotational inertia of the grindstone? b)what is the final kinetic energy of the grindstone? c)what was the angular acceleration while spinning up? d)how much torque was required to spin up the grindstone? e)how much work did it take to spin up the grindstone? f)what power was required to...
1. Find the moment of inertia of a stick of length 4 m and mass 10...
1. Find the moment of inertia of a stick of length 4 m and mass 10 kg that is rotated about an axis that is 30 % from the left end of the stick. Hint do the integration of r^2 dm 2. A 123 kg merry go round with a 5 m radius rotates on a vertical axis. If I push at the edge with a force of 188 N, find the angular acceleration. The moment of inertia of disk...
A 35g mass is attached by a string and rotates in a circle of radius 1.24m...
A 35g mass is attached by a string and rotates in a circle of radius 1.24m on a flat horizontal table as shown below. The mass starts out at a speed of 22 m/s and is slowed by friction. The coefficient of kinetic friction between the table and the mass is 0.17. (a) How much work is done by friction in slowing the mass to a stop? (b) What is the magnitude of the frictional force that slows the mass?...
Trucks can be run on energy stored in a rotating flywheel, with an electric motor getting...
Trucks can be run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 611 rad/s. One such flywheel is a solid, uniform cylinder with a mass of 551 kg and a radius of 1.1 m that rotates about its central axis. What is the kinetic energy of the flywheel after charging? If the truck uses an average power of 6.5 kW, for how many minutes can it operate between...
A small block on a frictionless, horizontal surface has a mass of 2.90×10−2 kg . It...
A small block on a frictionless, horizontal surface has a mass of 2.90×10−2 kg . It is attached to a massless cord passing through a hole in the surface (Figure 1). The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 2.53 rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. Model the block as a particle....
An LR circuit is hooked up to a battery as shown in the figure, with the...
An LR circuit is hooked up to a battery as shown in the figure, with the switch initially open. The resistance in the circuit is R=120 Ω, the inductance is L=4.90 H, and the battery maintains a voltage of E=37.0 V. At time t=0 the switch is closed. (A)What is the current through the circuit after the switch has been closed for t=5.31E-2 s? (B)What is the voltage across the inductor after the switch has been closed for t= 5.31E-2...
A 2400kg block of granite is pulled up an inclined plane at a constant speed of...
A 2400kg block of granite is pulled up an inclined plane at a constant speed of 1.3 m/s by an electric motor. The coefficient of kinetic friction between the granite and the surface is .18 … (a) How much work is done by gravity, friction, & the motor? (b) How much power must be supplied by the motor? (Pulled a distance of 50 meters in the x-direction and 30 meters in the y-direction)
1. Calculate the number of moles in an ideal gas trapped in a cylinder of diameter...
1. Calculate the number of moles in an ideal gas trapped in a cylinder of diameter .7 cm and a height of 10 cm, when pressure is at 1555 N/m2 at 6600 K. a) 7.9 x 10-17 b) 6.2 x 10-23 c) 1.09 x 10-7 d) 1.2 x 10-2 2. Convert 1700 degrees Fahrenheit to the Kelvin temperature scale. a) 1200 K b) 973 K c) 838 K d) 644 K 3. How much power is generated when a 78...
A small block on a frictionless, horizontal surface has a mass of 2.70×10−2 kg . It...
A small block on a frictionless, horizontal surface has a mass of 2.70×10−2 kg . It is attached to a massless cord passing through a hole in the surface (Figure 1). The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 2.33 rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. Model the block as a particle....
A uniform-density wheel of mass 8 kg and radius 0.42 m rotates on a low-friction axle....
A uniform-density wheel of mass 8 kg and radius 0.42 m rotates on a low-friction axle. Starting from rest, a string wrapped around the edge exerts a constant force of 14 N for 0.84 s. (a) What is the final angular speed? (a) ωf = radians/s (b) What was the average angular speed? ωaverage = radians/s (c) Through how big an angle did the wheel turn? θ = radians (d) How much string came off the wheel? d = m