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Posts Tagged ‘Physics’

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Physics question to all people that are good at physics?

December 8th, 2009   Posted by: admin

A circular curve of radius R in a new highway is designed so that a car traveling at speed v can negotiate the turn safely on glare ice (zero friction). If a car travels too slowly, then it will slip toward the center of the circle. If it travels too fast, then it will slip away from the center of the circle. If the coefficient of static friction increases, a car can stay on the road while traveling at any speed within a range from vmin to vmax. Derive formulas for vmin and vmax using mu for µ, and v, R, and g as appropriate.

Vmin=
Vmax=
The u thing is friction. Btw i did my homework, this is the only one i cant figure out.

By: Anonymous



2 Comments

Physics (friction) Please Me I **** in Physics?

November 6th, 2009   Posted by: admin

In loading a fish delivery truck, a person pushes a block of ice up a 20 degree incline at a constant speed. the push is 150 N in magnitude and parallel to the incline. The block has a mass of 35 kg
a. Is the incline frictionless
if not, what is the force of kinetic friction on the clock of ice

By: disaster



1 Comment

physics question.10 pts best answer?

November 3rd, 2009   Posted by: admin

Two figure skaters, one weighing 675 N and the other 750 N, push off against each other on very smooth ice.

1. If the heavier skater travels at 1.20 m/s, how fast will the lighter one travel?
2. How much kinetic energy is “created” during the skaters’ maneuver?
3. Where does this energy come from?

By: K M



1 Comment

physics question, I don’t get it?

October 11th, 2009   Posted by: admin

A 135 skater is coasting on a horizontal ice pond (frictionless)

what are the forces acting on the skater?

I got weight, what about normal force?

By: Na



5 Comments

physics acceleration?

October 3rd, 2009   Posted by: admin

can u explain how to do this..?
A speed skater moving across frictionless ice at 10.0 m/s hits a 5.0 m wide patch of rough ice. She slows steadily, then continues on at 7.0 m/s. What is her acceleration on the rough ice?

By: caliboy



2 Comments

physics genius needed! melting iceberg?

September 8th, 2009   Posted by: admin

Icebergs in the North Atlantic present hazards to shipping, causing the length of shipping routes to increase by about 30 percent during the iceberg season. Attempts to destroy icebergs include planting explosives, bombing, torpedoing, shelling, ramming, and painting with lampblack. Suppose that direct melting of the iceberg, by placing heat sources in the ice, is tried. How much heat is required to melt 10 percent of a 3.30×105 metric-ton iceberg? One metric ton is equal to 103 kg. Assume that the iceberg is at 0°C. (Note: To appreciate the magnitude of this energy, compare your answer to the Hiroshima atomic bomb which had an energy equivalent to about 15,000 tons of TNT, representing an energy of about 6.0×1013 J.)

if you could do this also check out:
http://answers.yahoo.com/question/index;_ylt=ArCjR81trugTUEyW7T4hJR_sy6IX;_ylv=3?qid=20090314110305AAlxxO3

http://answers.yahoo.com/question/index;_ylt=AginVcxbEFc.0q0D1VvoTwrsy6IX;_ylv=3?qid=20090314142105AAg83Dt

thanks in advance… 10 points per problem! start answering!! =)

By: =) <3



2 Comments

Physics- How far from initial position do you meet?

July 10th, 2009   Posted by: admin

You and a friend are on ice skates on an ice rink 20 m apart but held together by a rope. You pull your friend towards you with a force of 25 N. If you have a mass of 60 kg and your friend has a mass of 50 kg, how far from your initial position do you meet?

By: Macdaddy M



No Comments

One more question about heat - Physics?

June 12th, 2009   Posted by: admin

Given: latent heat of fusion of water
3.33 × 105 J/kg.
A 1.62 g lead bullet at 24.3◦C is fired at a
speed of 291 m/s into a large block of ice at
0◦C, in which it embeds itself.
What quantity of ice melts? Assume the
specific heat of lead is 128 J/kg ·
◦C. Answer
in units of g.

By: Sara Model



No Comments

Help with inertia? Best answer reward?

May 25th, 2009   Posted by: admin

Please help me study for my physics midterm! Best answer to those who help! thank you!

Sally the figure-skater is spinning on ice-skates. At first she has her arms close to her body, but then extends her arms away from her body while she continues to spin.

6) When Sally stretches her arms out, her rotational inertia:
a) increases
b) decreases
c) remains constant
d) changes, but we don’t know how

7) When Sally stretches her arms, her angular speed:
a) increases
b) decreases
c) remains constant
d) changes, but we don’t know how
8) When Sally stretches her arms, her angular momentum:
a) increases
b) decreases
c) remains constant
d) changes, but we don’t know how

By: Wen DZ



No Comments

Physics Question 10 points to best answer?

May 20th, 2009   Posted by: admin

on ice at a skating rink, a 75kg person pushes a 12kg person with a force of 3 N. what is the acceleration of the person doing the pushing? person that got pushed?

By: ej e



2 Comments

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