Physics - September 2007

A 52 kg person escapes from a burning building by jumping from a window 15 m above a catching net. Assuming that air resistance exerts a 95 N force on the person during the fall, determine the person's velocity just before hitting the net.

(answer in m/s)

2007-09-25 11:04:21 · 1 answers · asked by Anonymous

Two charges are fixed in place with a separation d. One charge is positive and has eight times (n = 8) the magnitude of the other charge, which is negative. The positive charge lies to the left of the negative charge, as in the figure. Relative to the negative charge, locate the two spots on the line through the charges where the total potential is zero.

positive distance to the left of -q ___?__ d
positive distance to the right of -q __?___d

2007-09-25 10:58:21 · 1 answers · asked by Desiree 1

You've seen how you can burn things with a magnifying glass and some sunlight before right? Well my question is what would happen if you did that under black light (alone)?

2007-09-25 10:58:14 · 2 answers · asked by 9 Toes 4

If I'm given v(t)=(6.0m/s^2)t + (3.0m/s), how do I find the position function?

2007-09-25 10:57:33 · 2 answers · asked by Anonymous

A 2kg object experiences a centripetal force of 32 N while traveling in a circle with a radius of 1 m. What is the velocity of the object?

2007-09-25 10:48:50 · 1 answers · asked by Anonymous

suppose an object has an initial velocity of 15m/s, at an angle of 30 degrees from the x-axis. what is the maximum height the object will go?

2007-09-25 10:46:38 · 1 answers · asked by mike b 1

Find the tension in each cable supporting the 540 N cat burglar in Figure P4.15. Assume the angle of the inclined cable is 36.0°.

http://www.webassign.net/sf5/p4_11alt.gif

inclined cable:
horizontal cable:




and also:

A van accelerates down a hill (Fig. P4.71), going from rest to 30.0 m/s in 7.10 s. During the acceleration, a toy (m = 0.350 kg) hangs by a string from the van's ceiling. The acceleration is such that the string remains perpendicular to the ceiling.
http://www.webassign.net/sf/p4_71.gif
angle = 25.5
find the tension of the string:


=D Thanks much!

2007-09-25 10:39:21 · 2 answers · asked by Bill 1

In a skating stunt known as "cracking-the-whip," a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 80.0 kg and is 4.90 m from the pivot. He is skating at a speed of 5.40 m/s. Determine the magnitude of the centripetal force that acts on him.

2007-09-25 10:33:27 · 1 answers · asked by mysterypenguin12 1

line across the graph would indicate ______ a. no motion b. constsnt speed c. steady accelaration d. maximum speed

2007-09-25 10:32:50 · 3 answers · asked by yakira v 1

2007-09-25 10:24:05 · 1 answers · asked by jaredmowbray2008 2

In a purely inductive AC circuit, L= 250mH and the r.m.s voltage is 150V.

2007-09-25 10:22:50 · 1 answers · asked by Anonymous

The formula for the Periodic Time is T=2pi/w
How do I derive this result.
I know that x=A(Sin wt +e)
I think if I find the period of the above equation I'll get the answer
but how do I find the period?
If some of you are out of context
x=Extension
A=Amplitude

2007-09-25 10:11:43 · 1 answers · asked by alanjb 1

A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book weighs 37 N. The coefficient of static friction between his hands and the book is 0.44. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?

2007-09-25 10:10:39 · 2 answers · asked by Anonymous

http://s223.photobucket.com/albums/dd78/floodtl/?action=view¤t=constantjerk.jpg

2007-09-25 09:47:08 · 2 answers · asked by Anonymous

like when you're near a black hole..time slows down...how? and why?

2007-09-25 09:38:22 · 5 answers · asked by Anonymous

2007-09-25 09:37:28 · 3 answers · asked by linzayy 1

if we travel faster than light..wats the impact on time?...can one go beyond a particular time?

2007-09-25 09:35:59 · 4 answers · asked by Anonymous

They all weigh 60kg.

http://s223.photobucket.com/albums/dd78/floodtl/?action=view¤t=Pullup.jpg

2007-09-25 09:23:32 · 1 answers · asked by Anonymous

A bunny is moving across the ice at a rate of 3.83 m/s (squared). The bunny comes to a stop 12.3 meters across the frozen ice. What is the initial velocity of the bunny? The answer is not 0.

2007-09-25 09:21:39 · 5 answers · asked by Andy D 3

2007-09-25 09:18:10 · 5 answers · asked by Sofy D 1

I was on my drive home the other day and somehow started to think about this. I know you can achieve constant accelleration, but somehow a system with constant jerk seems just out of my perception. I mean...the velocity would be increasing exponentially. And that seems a bit far fetched to me. What could possibly have so much thrust that it's velocity increases exponentially? I thought maybe a just-fired bullet, but that would be for only microseconds before drag, friction, and gravity all factored in.

2007-09-25 09:05:29 · 5 answers · asked by Toledo Engineer 6

2007-09-25 08:52:49 · 2 answers · asked by dlrhans 1

2007-09-25 08:43:22 · 3 answers · asked by Kome E 1

Two packing crates of masses m1 = 10.0 kg and m2 = 6.00 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 6.00 kg crate lies on a smooth incline of angle 42.0°. Find the acceleration of the 6.00 kg crate.
m/s2 (up the incline)
Find the tension in the string.
N

2007-09-25 08:22:38 · 2 answers · asked by Anonymous

2007-09-25 08:07:49 · 9 answers · asked by Anonymous

2007-09-25 08:03:24 · 7 answers · asked by Anonymous

Could a plane fly in a vacuum and could a rocket take off in a vacuum

2007-09-25 08:02:09 · 2 answers · asked by Anonymous

Suppose that in the same Atwood setup another string is attached to the bottom of m1 and a constant force f is applied,retarding the upward motion of m1. If m1=6.4 kg and m2=8.21 kg, what value of f will reduce the acceleration of the system by 50%?

2007-09-25 07:55:38 · 1 answers · asked by snow200098 2

2007-09-25 07:42:47 · 8 answers · asked by Anonymous

2007-09-25 07:41:24 · 5 answers · asked by Anonymous