re_defin3d

from the top edge of a horizontal plateau, a 175.0 N bag is launched horizontally by pressing it against a spring of force constant 385.0 N/cm. just before the launch, the spring is compressed 10.0 cm from its equilibrium position. once the bag is free of the spring, it goes over a vertical cliff 3.45 m high and lands in the snow below. how far from the foot of the cliff does the bag land, and how fast is it moving when it gets there?

a small 0.12 kg metal ball is tied to a very light (essentially massless) string 0.80 m long to form a pendulum that is then set swinging by releasing the ball from rest when the string makes a 45 degree angle w/ the vertical. air drag and other forms of friction are negligible. what is the speed of the ball when the string passes thru the vertical position, and what is the tension in the string at that instant?

a small mass M and a small mass 3M are 1.00 m apart. where should u put a third small mass so that the net gravitational force on it due to the other 2 masses is zero?

a crate slides up an inclined ramp and then slides down the ramp after momentarily stopping near the top. this crate is acted upon by friction on the ramp adn accelerates both ways. what statement about the crate's acceleration is correct?

a) acceleration going up the ramp is greater than acceleration goin down

b) acceleration going down the ramp is greater than acceleration going up

c) acceleration is same in both directions

a block is placed against the vertical front of a cart. what acceleration must the cart have in order that the block does not fall? the coefficient of static friction b/w the block and cart is Us.

In emergencies with major blood loss, the doctor will order the patient placed in the Trendelberg position, which is to raise the foot of the bed to get the maximum blood flow to the brain. if the coefficient of static friction between the typical patient and bedsheet is 1.2, what is the max. angle at which the bed can be tilted wrt to the floor before the patient begins to slide?

Help is appreciated!

two boxes are connected by a light string that passes over a light, frictionless pulley. one box (50 kg) rests on a frictionless ramp that rises at 30 degrees above the horizontal and the system is released from rest. the other box is 30 kg and is hanging. which way will the 50 kg box move - up the plane, or down the plane? or will it even move at all?

can someone please explain how i can approach this question? thanks.

a parachutist relies on air resistance to decrease her downward velocity. she and her parachute have a mass of 55 kg, and air resistance exerts an upward force of 62 N on her and her parachute. calculate the net force on the parachutist (plus her parachute). is the net force upward or downward? what is the acceleration of the parachutist?

a basketball player has a standing vertical jump of 1.2m. he weighs 890 N (200 lb). use newton's laws to calculate the force he applied to the ground during his jump.

suppose you use a rope to hoist a box of tools vertically at a constant speed, v. the rope exerts a constant upward force of magnitude Fup on the box, and gravity exerts a constant downward force (weight of the box). no other forces act on the box. to raise the box twice as fast, the force of the rope on the box would have to have:

a) same magnitude Fup

b) magnitude of 2Fup

a 76 kg boulder is rolling horizontally at a top of a vertical cliff that is 20m above the surface of a lake. the top of the vertical face of a dam is located 100 m from the foot of the cliff, with the top of the dam level with the surface of the water in the lake. a level plain is 25 m below the top of the dam. what must the minimum speed of the rock be just as it leaves the cliff so that it will travel to the plain without striking the dam?

a movie stuntwoman drops from a helicopter that is 30 m above ground and is moving with a constant velocity whose components are 10 m/s upward and 15 m/s horizontal and toward south. ignore air resistance. where on the ground (relative to position of the helicopter when she drops) should the woman have placed foam mats that break her fall?

A player kicks a football at an angle of 40 degrees with the horizontal, with an initial speed of 12.0 m/s. A second player standing at distance of 30.0 m from the first (in the direction of the kick) starts running to meet the ball at the instant it is kicked. how fast must he run in order to catch the ball just before it hits the ground?

I'm planning on going to Malaysia next June/July from Toronto, and I'm wondering when's the best time to book my flight (so I can get the cheapest air fare as possible)?

please help me solve this integral :]

x^5e^(x^2) dx

please help me solve this integral..i am stuck

integral: square root of 9 +4x^2 dx

Can someone help compute this integral:

f x ln(2x-1) dx

I'm a current university student looking to find a good laptop. I've narrowed down my choices b/w Sony Vaio and LG.

Sony VAIO VGNFS980:

Processor Intel Pentium M 740

Processor Speed 1.73GHz

Memory 1.0GB DDR2

Hard Drive 80GB

CD-DVD Drive DVD+R Double Layer / DVD+/-R/RW

Display 15.4" WXGA

LG F1-2225A9:

Processor Core Duo

Processor number T2250

Processor speed 1.73 GHz

Motherboard chipset Intel 945GM

Centrino Yes

Memory/Storage

Amt of RAM 512 MB (max 2048 MB)

Hard drive 80 GB

Card Reader SD, MMC, MS, MS Pro

Optical drive DVD Super Multi drive

LG's processor is a Core Duo, while Sony's is Intel Centrium (solo) processor. Does it REALLY matter whether the processor is duo or not? So, which laptop is better? (Prices of the laptops are pretty much the same)