Physics - December 2007

I have been trying this question for close to two hours now and have gotten it incorrect three time. I would appreciate any help!

The spring has a constant of 30 N/m and the frictional surface is .3 m long with a coefficient of friction μ = 1.02. The 4 kg block depresses the spring by 17 cm, then is released. The first drop is 1.4 m and the second drop is 1 m. How far from the bottom of the cliff does it land? Answer in units of m.

I posted the same question on cramster so I could draw you a picture. http://answerboard.cramster.com/phys...-151971-0.aspx

I tried to find the energy stored in when it is compressed at distance 1 by doing
w = Fd ...w = (30)(.17)
After that, I tried to find the time it took to fall at both place, but I fell short of information.
And then I tried to athe formula I found in my book but I wasn't sure what went where. Now I am at a dead end and am extremely confused. Will someone please help?!?!!

2007-12-01 14:06:26 · 1 answers · asked by Anonymous

2007-12-01 13:41:51 · 1 answers · asked by nil 1

A 85.5 kg astronaut is working on the engines of a spaceship that is drifting though space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 39.1 m behind the ship, at rest relative to the spaceship. The only way to return to the ship is to tho a wrench directly away from the ship. The wrench has a mass of 0.577 kg, and the astronaut throws the wrench at a speed of 24.0 m/s. How long does it take the austronaut to reach the ship?

2007-12-01 12:55:07 · 4 answers · asked by Anonymous

A 59.7 kg, 3.4 m uniform ladder leans against a frictionless wall. A 90.7 kg person is standing up 0.74 m from the bottom of the ladder. The ladder makes an angle of 63 degrees with the horizontal. The coefficient of static friction between the ladder and the ground is 0.15. What is the force of the wall on the top of the ladder?

A. 221.1 N
B. 841.9 N
C. 25.3 N
D. 396.7 N
E. 247.6 N

2007-12-01 12:38:11 · 1 answers · asked by Curious 1

A baseball is hit at an initial velocity of 110 ft/s at an angle of 45 degrees above the horizontal. Will the ball clear a 10.0 ft fence 300 ft from home plate for a home run? If so, by how much will it clear the fence? If not, how far in front of the fence will it land or where will it hit the wall?

2007-12-01 12:34:51 · 3 answers · asked by Daydreamer 3

Find the resultant of the following set of forces. (a) 200 N @ 53 degrees (b) 300 N @ 150 degrees (c) 200 N @ 270 degrees, and (d) 350 N @ 310 degrees.

2007-12-01 12:29:35 · 1 answers · asked by Daydreamer 3

A ceiling fan is rotating at 1.00 rev/s. When turned off, it slows uniformly to a stop in 10 s.
(a) How many revolutions does it make in this time?
(b) Using the result from part (a), find the number of revolutions the fan must make for its speed to decrease from 1.00 rev/s to 0.50 rev/s.

2007-12-01 11:59:48 · 4 answers · asked by Anonymous

an 85 g wooden block is set up against a spring. The block rests on a smooth surface. The block is pushed into the spring, compressing it a distance of 2.0 cm and then released. The spring constant is k=78 N/m. What is the speed of the block when it reaches its initial position ( where the spring was not compressed)?

2007-12-01 11:56:38 · 1 answers · asked by unknown 1

Jeff of the Jungle swings on a vine that is r = 6.20 m long . At the bottom of the swing, just before hitting a tree, Jeff's linear speed is 8.70 m/s.
(a) Find Jeff's angular speed at this time= 1.40
(b) What centripetal acceleration does Jeff experience at the bottom of his swing?
Please help with part B

2007-12-01 11:53:50 · 1 answers · asked by Anonymous

At what altitude above the Earth's surface is the acceleration due to gravity equal to g/5?

Please provide an answer i have 2 tries left on Webassign

2007-12-01 11:50:35 · 1 answers · asked by Anonymous

a scale whose smallest divisions are in centimeters is to be provided with vernier which will enable fifths-of-centimeter divisions to be accurately estimated. how many vernier divisions should be used, and how long will each one be???

2007-12-01 11:12:11 · 1 answers · asked by ganda 1

To dislodge ketchup from the bottom of a ketchup bottle, the bottle is often turned upside down, thrust downward at a high speed and then abruptly halted, and I know that's got to do with Newton's First Law.

But how would I describe how it is? I don't know how to explain it.

2007-12-01 10:48:25 · 6 answers · asked by Anonymous

1) A stick of length L = 2.0 m oscillates as a physical pendulum. (a) What value of distance x between the stick's center of mass and its pivot point O gives the least period? (b) What is that least period?

2007-12-01 10:43:23 · 1 answers · asked by Anonymous

a spring has a spring constant of k=55.0 N/m. The spring is compressed a distance of 3.50 cm. What is the potential energy start in the spring?

2007-12-01 10:40:23 · 2 answers · asked by 832 1

Use the information given in the figure for the series RCL circuit to determine the phase angle between the current and the voltage.
(a) zero degrees (b) +5.3° (c) –9.6°(d) –84°(e) +90°

L= .035 H
V = 60 Hz
R = 150 ohms
C = 1.75 x 10^-6 F

Ive been trying to figure it out for an hour, the answer is -84 degrees but i dont understand how to get that.

2007-12-01 10:28:25 · 3 answers · asked by Abc 3

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2007-12-01 10:03:01 · 1 answers · asked by paula t 1

I've heard if you open a bag of flour, and toss it's contents in the air and light a match, the room would detonate. Is this true??

2007-12-01 10:02:17 · 3 answers · asked by ИΦĬςΩҐҐļº² 2

When completely immersed in water, however, it has a weight of Win water = 4.1 N. Find the volume of the paperweight.

2007-12-01 10:00:35 · 2 answers · asked by Anonymous

When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 20 rad/s in 0.65 s. Assuming the CD is a uniform solid disk, determine the net torque acting on it.

2007-12-01 09:57:22 · 2 answers · asked by Anonymous

A rapidly spinning paddle wheel raises the temperature of 200 mL of water from 21C to 25C. How much (a) work is done and (b) heat is transferred in this process?

2007-12-01 09:55:34 · 2 answers · asked by Anonymous

Since there are more rods than cones, you would think we would be able to see better at night, because rods respond to dim light. But this is not true....please explain why! thanks.

2007-12-01 09:08:17 · 2 answers · asked by tennis_tacos 1

A force of 40.0 N is required to start a 5.0 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 40.0 N force continues, the box accelerates at 0.70 m/s^2. What is the coefficient of kinetic friction?

Please show and explain all work please.

2007-12-01 08:53:00 · 1 answers · asked by Kantilal P 1

2007-12-01 08:47:28 · 2 answers · asked by Ultraviolet Oasis 7

please show work and explain

2007-12-01 08:25:46 · 1 answers · asked by Anonymous

2007-12-01 08:15:17 · 3 answers · asked by Shadowdrake 2

equation?

2007-12-01 08:13:21 · 2 answers · asked by Ultraviolet Oasis 7

I am just starting to learn about the quantum theory. I am kind of lost because I really do not understand this theory at all. If it it helps at all, we are learning about the shift from Bohr's orbit model to Schrodinger's wave model. If somebody could help me understand this theory that would be great!

2007-12-01 07:55:35 · 2 answers · asked by gordja09 1

i know quantum physics, but how can the electron pass from an energy state to the next one, is it like it disppears on the first energy state and appear on the second?????

2007-12-01 07:52:17 · 1 answers · asked by Anonymous

Is it not easier to have kilometers instead of miles and
kilograms in place of pounds & so on .

2007-12-01 07:01:54 · 4 answers · asked by Anonymous

A. longitudinal waves B. sound waves C. light waves
D. all of the above E. none of the above

2007-12-01 07:01:26 · 2 answers · asked by Tenga M 1