# RE: phhysics

posted by .

Posted by Charlene on Friday, March 23, 2007 at 3:00am.

picture in your mind a block that slides without friction down a ramp that is inclined at an angle (q) above the horizontal. Initially the block is at rest a distance (s) in meters (measured along the plane) from the bottom. Calculate the time (in seconds) required for the block to slide to the bottom.

can some1 show me the formula to find the time? for some reason, i can't find it in my textbook.

* physics - drwls, Friday, March 23, 2007 at 8:04am

With no friction, the weight component down the ramp is Mg sin A, where g is the angle. That equals M a, so the acceleration is a = g sin A
The time T required is given by
(1/2)a T^2 = (1/2)g sin A
Solve for T

ookk. but what if there is no weight or mass of the block given? and only the angle and length? which is: 1 degrees & 300 meters. i have to find T in seconds.. would i do this?

(1/2)a T^2 = (1/2)g sin A
(1/2)(-.999)(T^2) = (1/2)(1)sin(300)

?? im still confused. help!

Please note the mass divides out, you don't need it.

a= gSinA
s= 1/2 a t^2 put in a, then solve for t.

t= sqrt 2s/a = sqrt (2s/gSinA)

thanks!

.. i kept gettin' the wrong answers.. and i was doing everything correctly!! then i realized my calculator was set to radians instead of degrees. arggh! lol

## Similar Questions

1. ### phhysics

picture in your mind a block that slides without friction down a ramp that is inclined at an angle (q) above the horizontal. Initially the block is at rest a distance (s) in meters (measured along the plane) from the bottom. Calculate …
2. ### Physics - Mechanics and Ocsillatory Motion

An 8.70 kg block slides with an initial speed of 1.56 m/s up a ramp inclined at an angle of 28.4 with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.62. Use energy conservation to find the distance …
3. ### College Physics

An 8.67-kg block slides with an initial speed of 1.50 m/s down a ramp inclined at an angle of 27.1° with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.65. Use energy conservation to find the …
4. ### Physics

An 8.74-kg block slides with an initial speed of 1.52 m/s down a ramp inclined at an angle of 27.0° with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.64. Use energy conservation to find the …
5. ### Physics

An 8.70 kg block slides with an initial speed of 1.56 m/s **down** a ramp inclined at an angle of 28.4 with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.62. Use energy conservation to find …
6. ### physics

An 8.65-kg block slides with an initial speed of 1.52 m/s up a ramp inclined at an angle of 27.6° with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.56. Use energy conservation to find the …
7. ### physics

A 20 kg block slides with an initial speed of 11 m/s up a ramp inclined at an angle of 25o with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.8. Use energy conservation to find the distance …
8. ### physics 221

Question Part Points Submissions Used An 8.61-kg block slides with an initial speed of 1.72 m/s down a ramp inclined at an angle of 27.4° with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.73. …
9. ### physics

I am having great difficulty with this question. A block is placed on a frictionless ramp at a height of 12.5 m above the ground. Starting from rest, the block slides down the ramp. At the bottom of the ramp, the block slides onto …
10. ### Physics

A block is placed on a frictionless ramp at a height of 14.5 m above the ground. Starting from rest, the block slides down the ramp. At the bottom of the ramp, the block slides onto a frictionless horizontal track without slowing down.At …

More Similar Questions