Physics - October 2007

A defibrillator passes a brief burst of current through the heart to restore normal beating. In one such defibrillator, a 40.0 µF capacitor is charged to 6.0 kV. Paddles are used to make an electrical connection to the patient's chest. A pulse of current lasting 1.0 ms partially discharges the capacitor through the patient. The electrical resistance of the patient (from paddle to paddle) is 230 . What is the initial current through the patient?


if anyone can help me with this question,
i would really appreciate it!
please have mercy n help meeee!

2007-10-04 10:39:57 · 4 answers · asked by Anonymous

a sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclinded at 20degrees above horizontal. The sledge moves a distance of 20.m on a horizontal surface. the coefficient of kinetic friction between the sledge and surface is .500.
a). what is the tension in the rope?
b). How much work is done by the rope on the sledge
c) what is the mechanical energy lost due to friction

Thankyou!!!

2007-10-04 10:35:19 · 1 answers · asked by Ashley P 1

how did the titanic float?
and... how did the titanic sink?

2007-10-04 10:14:00 · 4 answers · asked by Anonymous

A fighter jet is launched from a aircraft carrier with the aid of its own engines and a steam-powered catapult. the thrust of its engines is 2.3x10^5N. In being launched from rest it moves through a distance of 87 meters and has a kinetic energy of 4.5x1.^7 J at lift off. what is the work done by the catapult?

2007-10-04 09:27:38 · 3 answers · asked by kwali 2

cuz im hungry

2007-10-04 09:25:25 · 5 answers · asked by Anonymous

Can anyone explain how to solve for the total effective resistance of the combination of resistors shown in this link.

http://tinypic.com/view.php?pic=bf2xpk&s=2

2007-10-04 09:23:55 · 1 answers · asked by Britna 1

OK if you can help me up with this i would be very grateful. A person pushes a cart at a constant velocity a distance of 22.0m. She pushes in a direction 29.0 degrees below the horizontal. A 48N frictional force opposes the direction of the cart. what is the magnitude of the force that the shopper exerts? determine the work done by the (a) pushing force, the (b)frictional force and (c) the gravitational force.

2007-10-04 09:12:54 · 3 answers · asked by kwali 2

2007-10-04 09:00:09 · 2 answers · asked by Legolas 5

I think it is parallel, but I want to make sure.

2007-10-04 08:54:54 · 3 answers · asked by rath 5

What happens when an unstopable force hits an unmovable object?

2007-10-04 08:53:30 · 4 answers · asked by Anonymous

1. A block of mass 6 kg, which has an initial
speed of 2 m/s at time t = 0, slides on a
horizontal surface.
Calculate the work W that must be done
on the block to bring it to rest. Answer in
units of J.

2. If a constant friction force of magnitude
10 Newtons is exerted on the block by the
surface, find the acceleration of the block in
absolute value. Determine the speed v of the block as a function of the time t. Answer in units of m/s2.

2007-10-04 08:08:09 · 1 answers · asked by Anonymous

If the shape of an object is changed, does that change the shape of its gravitational field. or does a gravitational field always have to be spherical.

2007-10-04 06:45:50 · 4 answers · asked by Anonymous

2007-10-04 06:37:28 · 1 answers · asked by ladytilend 1

Accurate answers please! Thanks!

2007-10-04 06:17:10 · 8 answers · asked by ~*o*Babee.Bubblez*o*~ 2

An airplane, diving at an angle of 48.0° with the vertical, releases a projectile at an altitude of 760 m. The projectile hits the ground 6.00 s after being released. (Assume a coordinate system in which the airplane is moving in the positive horizontal direction, and in the negative vertical direction. Neglect air resistance.)
(a) What is the speed of the aircraft in m/s?
(b) How far did the projectile travel horizontally during its flight in meters?
(c) What were the horizontal and vertical components of its velocity just before striking the ground in m/s?

2007-10-04 06:11:33 · 2 answers · asked by Anonymous

from the point on the ground directly below the edge of the platform, what is the height of the platform? Thank you

2007-10-04 05:37:16 · 1 answers · asked by Anonymous

incline at an angle of 30 degrees to the horizontal. It then goes down a 15.0 m ramp with an incline of 40 degrees to the horizontal. When the roller coaster has reached the bottom of the ramp, what is its displacement from its starting point? Thank you

2007-10-04 05:35:42 · 1 answers · asked by Anonymous

For this problem he wanted us to find the formula that gives the speed of the block as a function of spring displacement. In other words.. v=v(x)where 0
A block of mass 0.80 kg is given an initial velocity v=1.2m/s to the right along a frictionless surface and collides with a spring of negligible mass and spring constant k=50 N/m . [Note. The spring is uncompressed until the block collides with it.]

the initial energy was .576 J
the final energy was the same.
The maximum x value was calculated to be x=.152 m.

2007-10-04 05:34:35 · 1 answers · asked by jack86 1

How much longer does the run take if the coefficient of kinetic friction is 0.17 instead of 0?

I found the time for 0, but don't know how to change the formula for kinetic friction.

2007-10-04 05:33:32 · 1 answers · asked by lilrnblover86 4

a continuous constant acceleration of .75 m/s squared in the -y direction. What is the position of the particle 4.0 seconds later? Thank you

2007-10-04 05:33:05 · 1 answers · asked by Anonymous

through what potential difference would an electron need to be accelerated for it to achieve a speed of 3% of the speed of light (2.99792 * 10^8 m/s), starting from rest? an answer in units of V.

2007-10-04 05:24:24 · 1 answers · asked by Jack 1

3000 cal.
27000 cal.
135000 calories.
270000 calories

2007-10-04 05:16:28 · 2 answers · asked by thugluvn20 1

A tennis ball rolls off the edge of a tabletop of height 0.770m above the floor and strikes the floor at a point a horizontal distance 1.50m from the edge of the table. You can ignore air resistance. Find the magnitude of the initial velocity.

2007-10-04 05:13:55 · 2 answers · asked by Natiphy2007 1

If the total kinetic energy of a colliding proton and anti-proton increases what difference does this have to the subatomic paticles produced?
Can someone help me please with the above!?
Thankyou

2007-10-04 04:19:58 · 1 answers · asked by Ash 2

A projectile (mass = 0.191 kg) is fired at and embeds itself in a target (mass = 2.07 kg). (The target is initially stationary). The target (with the projectile in it) flies off after being struck. What percentage of the projectile's incident kinetic energy does the target (with the projectile in it) carry off after being struck?

2007-10-04 04:16:02 · 2 answers · asked by txsweetpea512 1

How much work must the man do, to accelerate the crate to speed 1m/s?

2007-10-04 04:11:22 · 2 answers · asked by Alexander 6

2007-10-04 03:08:13 · 9 answers · asked by Kim Harold A 1

2007-10-04 02:26:42 · 4 answers · asked by Kim Harold A 1

2007-10-04 02:12:39 · 3 answers · asked by Kim Harold A 1

how much energy is needed to raise temperature of 0.6 kg of lead from 15 degrees celcius to 200 degrees celcius

2007-10-04 01:21:39 · 5 answers · asked by cha 2