Physics - October 2006

.30 m and mass of 1.1 kg is rotating at 93.6 rad/s. What torque is necessary to stop the tire in 1.72s ? Answer in uits of N.m

2006-10-31 04:35:40 · 1 answers · asked by Dee 4

A sled weighing 60.0N is pulled horizontally across snow so that the coefficient of kinetic friction between the sled and the snow is 0.100. A penguin weighing 70.0N rides on the sled. If the coefficient of static friction between the penguin and the sled is 0.700, find the maximum horizontal force that can be exerted on the sled before the penguin begins to slide off.

I'm not sure what the answer is.

I asserted that since the penguin is on the sled the normal force of the system is 130N, so I found the force of friction using the coefficient of kinetic friction to be 13N. Then I found the force of friction of the penguin sliding off, using the coefficient of static friction and a normal force of 70N of the penguin, to be 49N. I said that since it is moving at a constant speed there has to be a force of 13N on the sled already, so if I subtract 13N from 49N I would get 36N. So 36N is the force that is needed to slide the penguin off, right? or would it be 13N+49N=62N? Thanks so much!

2006-10-31 04:30:54 · 2 answers · asked by akujinduck 1

See the figure at http://i14.tinypic.com/40dz9eb.gif.

The masses, of mass m, are 'particles'. The rods, of mass M and length L, are 'thin'. I'm trying to help someone answer the question "What is the rotational energy and kinetic energy?" I think given I, the rest I can do OK. Many thanks to anyone who can help.

2006-10-31 04:26:24 · 1 answers · asked by sojsail 7

The guy who answered this yesterday was totally off.
I'm given the minimum amount of energy, 2.0x10^-17 J. I have to calculate how many photons of red light (700 nm) are needed to reach that. How do I do that?

2006-10-31 04:14:56 · 3 answers · asked by velmakelly777 1

A car travels 60 miles at a speed of 60 miles per hour. It then travels another 60 miles at a speed of 40 miles per hour. What is the car's average speed for this trip

2006-10-31 04:10:11 · 4 answers · asked by maconheira 4

2006-10-31 04:05:20 · 4 answers · asked by goring 6

2006-10-31 03:44:14 · 2 answers · asked by utkarsh 2

2006-10-31 03:40:59 · 7 answers · asked by goring 6

2006-10-31 03:38:25 · 8 answers · asked by Anonymous

so what is the meaning of spin; is it spin ernergy or strainght line energy?

2006-10-31 02:50:31 · 2 answers · asked by goring 6

2006-10-31 02:34:19 · 3 answers · asked by goring 6

2006-10-31 02:32:06 · 1 answers · asked by shainy p 1

x=3cost+4sint is the position of an oscillating particle at time t.Find the acceleration of the particle at two extreme points of oscillation.

2006-10-31 02:27:12 · 8 answers · asked by laily 1

2006-10-31 02:20:32 · 13 answers · asked by Lisa 3

A 65.0 kg person, running horizontally with a velocity of +3.68 m/s, jumps onto a 12.2 kg sled that is initially at rest.

(a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away.
(this is right with 3.1 m/s)
(b) The sled and person coast 30.0 m on level snow before coming to rest. What is the coefficient of kinetic friction between the sled and the snow?
How do I figure out the coefficient of friction.

2006-10-31 02:14:23 · 1 answers · asked by Confused 1

A 4.00 kg ball (ball 1), moving to the right at a velocity of +3.00 m/s on a frictionless table, collides head-on with a stationary 7.80 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below.
(a) elastic collision
ball 1
?? m/s
ball 2
?? m/s
(b) completely inelastic collision
ball 1
(I got this right with 1.02 m/s)
ball 2
(I got this right with 1.02 m/s)

I know part one has to do with conservation of KE, but whenever I try to work it, I get a wrong answer. Can someone help me?

2006-10-31 02:13:19 · 2 answers · asked by Confused 1

now theres a small shadow there...what caused the shadow

2006-10-31 01:32:13 · 4 answers · asked by Anonymous

2006-10-31 01:29:25 · 9 answers · asked by Naresh Kumar 1

2006-10-31 01:21:22 · 10 answers · asked by john a 1

please explain...

2006-10-31 01:17:36 · 6 answers · asked by Anonymous

2006-10-31 01:08:27 · 3 answers · asked by einstein 1

2006-10-31 01:01:25 · 4 answers · asked by MANOHAR CH 1

2006-10-31 00:53:02 · 8 answers · asked by Anonymous

If so what would its properties/uses be?

2006-10-31 00:37:02 · 7 answers · asked by Calchas 3

my question is:
A stone of weight 32N is attached to a wire and hung from a rigid support. A string is then attached to a stone and pulled sideways with a horizontal force P until the tension in the wire is 44 N:
-what is the angle between the wire and the vertical?
-calculate the size of the force P
-repeat the calcuklation fro the case when the tension reaches 140N.

I found the answer for these question however, then i understood tht i might have to convert the weight 32N into kg before doing the question... so is my prediction right... or do i do the calculation with the 32N? if i am converting thn how do i convert 32N into Kg?
any valid answer will be welcomed. Thx in advance.

2006-10-31 00:30:52 · 3 answers · asked by bex 2

If yes then wave speed depends on frequency & speed does not....ugh i m so confused....If no, can v use wave speed instead of speed of sound in solving numericals?

2006-10-31 00:21:04 · 3 answers · asked by cooltan 1

2006-10-31 00:09:36 · 3 answers · asked by sadeq m 1

2006-10-30 23:44:23 · 8 answers · asked by Anonymous

no details

2006-10-30 23:07:18 · 12 answers · asked by Anonymous

2006-10-30 22:06:26 · 8 answers · asked by edi d 1