Physics - September 2007

A billiard ball,.008kg at a speed of 10m/s hits another ball at rest after impact. The 2 balls move at an angle of 30degrees in the x axis. Find the speed of the balls after impact?

2007-09-30 23:34:20 · 1 answers · asked by clickfalcon 2

Please help me and show me how to do this problem!

2007-09-30 22:12:09 · 5 answers · asked by :) 2

I have no idea how to calculate free fall! What are the equations for it? And can somebody show me how to do these 2 equations:

A ball is thrown straight down with an inital speed of 20m/s. After 3 seconds, how fast is it going?

You shoot an arrow straight up at 50m/s. When will it run out of speed.

Please help!

2007-09-30 21:11:22 · 1 answers · asked by :) 2

2007-09-30 20:49:40 · 3 answers · asked by manju 1

A box of books weighing 320 N is shoved across the floor of an apartment by a force of 430 N exerted downward at an angle of 35.0° below the horizontal. If the coefficient of kinetic friction between box and floor is 0.57, how long does it take to move the box 4.10 m, starting from rest?

2007-09-30 19:43:00 · 2 answers · asked by Anonymous

lying in the xy plane

2007-09-30 19:28:08 · 4 answers · asked by shygl409 2

The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply upward at the end. The sharp upward slope launches them into the air, where they perform acrobatic maneuvers. In the women's competition, the end of a typical launch ramp is directed 58° above the horizontal. With this launch angle, a skier attains a height of 12 m above the end of the ramp. What is the skier's launch speed?

2007-09-30 18:46:54 · 1 answers · asked by Anonymous

Hello everyone,
I'm doing a paper in Physics; I have to choose 3 electrical phenomena... I already picked "Static Electricity" and "Lightning," can you, please, help me find a third one?

Thanks

2007-09-30 18:05:12 · 2 answers · asked by Anonymous

In the electromagnetic spectrum, gamma rays, x rays, ultra violet light, infrared, microwaves, radio frequencies are actually there, or present in the air, but we as humans are unable to see them? am i correct? and they move in waves much like the waves in water or the ocean?
thanks

2007-09-30 17:41:21 · 4 answers · asked by Boo Radley 4

A plane 5 meter in length is inclined at an angle of 37. A block of weight 20N is placed at the top of the plane and allowed to slide down. The work done on the block by the gravitational force during the 5m slide down the plane is most nearly
A)20J
b)60J
c)80J
d)100J
e)130J

2007-09-30 16:57:39 · 4 answers · asked by myway061 1

When solving for E= hc/λ,
does the wavelength have to be in meters or nm?
and what are the units?

2007-09-30 16:56:16 · 3 answers · asked by desigoddess217 1

2007-09-30 16:53:23 · 7 answers · asked by dbol2005 1

1. a monkey hangs stationary at the end of a vertical vine. What two forces act on the monkey? which, if either, is greater?

2. can an object be in mechanical equilibrium when only a single force acts on it ? explain.

3. if you pull horizontally on a crate with a force of 200 N, it slides across the floor in dynamic equilibrium. how much friction is acting on the crate ?

4. what is the definition of support force ?

5. what is the definition of static & dynamic equilibrium ?

please explain your answers - i need answers and the knowledge of how to do the problems on my own as well. thank you !

2007-09-30 16:51:27 · 3 answers · asked by Anonymous

A power boat of mass 450 kg is cruising at a constant speed of 8.9 m/s. The propeller provides a drive force of 745 N. The driver of the boat shuts off the engine, and the boat coasts to a halt. Assume -- contrary to fact -- that the resistive force due to the water is constant, independent of the boat's speed.
How far does the boat coast??
How much time does it take for the boat to come to rest after the engine is turned off??

2007-09-30 16:40:40 · 2 answers · asked by Anonymous

i am doing a lab trying to find the density of a snickers bar and a 3 musketeers. i am using a snickers, 3 musketeers, triple beam balance, and ruler. what is the independent variable in this experiment? and the dependent variable? i think the dependent variable is the density. what about the controls? thank you! p.s. if u could give me the procedures for the way i would do this experiment would be nice too.

2007-09-30 16:37:25 · 2 answers · asked by Sarah S 3

2007-09-30 16:35:17 · 3 answers · asked by Christa 1

A rocket moves upward, starting from rest with an acceleration of 31.0 m/s2 for 8.00 s. It runs out of fuel at the end of the 8.00 s but does not stop. How high does it rise above the ground?

2007-09-30 16:29:35 · 2 answers · asked by lala 1

say for instance their is a 1.91N block on a 16 degree incline. It is pushed and moves down the board at a constant speed (no accleration) how do I go about calcualting the coefficient of kinetic friction

2007-09-30 16:29:11 · 2 answers · asked by akanthasy 1

A ball is droppred from a roof and takes 3.0 s to reach the ground. Calculate the elevation of the roof above the ground in meters. (Neglect air resistance)

2007-09-30 16:17:39 · 5 answers · asked by Ice Cube 1

2007-09-30 16:15:41 · 7 answers · asked by Anonymous

why does a really dense liquid sink when a less dense liquid float? is it because a dense liquid is heavier/

2007-09-30 16:10:07 · 4 answers · asked by Sarah S 3

crap or scientifically possible?

2007-09-30 15:59:31 · 5 answers · asked by Curious 3

Please explain it because i have to take a seminar on it.

2007-09-30 15:52:06 · 3 answers · asked by sasi s 1

2007-09-30 15:44:44 · 1 answers · asked by wtfitsnguyen 2

Hey. Can you help me derive these formulas using:
delta V = A (delta T)
delta X = (Initial Velocity) (Time) + (0.5) (-9.81) (time squared)

The formulas are:

(Total distance in y) = (abs value of V)^2 (sin (angle of release))^2 / (-9.81)

Height = (0.5) (abs value of V) (sin (angle of release))^2 / (-9.81)


THANKS FOR THE HELP!

2007-09-30 15:29:46 · 2 answers · asked by mimi 2

jet aircraft mechanics wearing ear protectors are able to converse with each other because the ear protectors block out the sound of the jet engine. What physics concept would account for this?

2007-09-30 15:23:24 · 1 answers · asked by dbol2005 1

A speeding car is traveling at a constant speed of 10.0 m/s when it passes a stopped police car. the police car accelerates at 7.0 m/s^2. How fast will it be going when it catches up with the speeding car?

2007-09-30 15:16:25 · 1 answers · asked by georgie0515 1

Two same mass cars collide with each other while going at constant speed, will both of the cars exert the same force? Friction is ignored

A car hits another standing car will the moving car exert higher force on the non moving car? Both car masses are the same

2007-09-30 15:15:51 · 1 answers · asked by Greta J 2

gravity on mercury is .38 the amount it is on earth

2007-09-30 15:06:29 · 1 answers · asked by Anonymous

A 30kg block is at rest on a 31 degree incline. The coefficients of static and kinetic friction are .65 and .55 respectively. The accleration of gravity is 9.8m/s2. What is the frictional force acting on the 30 kg mass. Also, what is the largest angle which the incline can have so the mass does not slide down the incline

2007-09-30 14:55:26 · 1 answers · asked by akanthasy 1