Physics - December 2006

A ball is being released onto a ramp that is on a table that ends where the ramp does. When the ramp stops, the ball will fly into the air into a can.

Using this equation: ∆y = vy i t + ½ gt2 (the gt is raised to the 2 power, not times two), what is the time it would take, t, for a ball to fall from the bottom end of the ramp and land into a can that is 10.5 cm tall

g= -9.81m/s
vx = .63m
the distance from the ramp to the can is 1.75 m

2006-12-03 18:39:48 · 1 answers · asked by susie q 2

A ball is being released onto a ramp that is on a table that ends where the ramp does. When the ramp stops, the ball will fly into the air into a can.

Using this equation: ∆y = vy i t + ½ gt2 (the gt is raised to the 2 power, not times two), what is the time it would take, t, for a ball to fall from the bottom end of the ramp and land into a can that is 10.5 cm tall

g= -9.81m/s
vx = .63m
the distance from the ramp to the can is 1.75 m

2006-12-03 18:36:25 · 2 answers · asked by susie q 2

2006-12-03 18:35:33 · 4 answers · asked by bhupesh g 1

...or no antimatter at all? Have we found antimatter? If so, how? Considering it would not last?

2006-12-03 18:28:42 · 8 answers · asked by Anonymous

2006-12-03 18:26:49 · 5 answers · asked by anonymous 4

2006-12-03 17:24:41 · 4 answers · asked by Rock 1

I have regular hydrometers to tell the specific gravity, anyone know what specific gravity converts to in ABV%?

2006-12-03 17:10:37 · 1 answers · asked by Anonymous

Imagine infinite row of uniform spheres of mass m and radius r/2 touching each other. According to gravity theory the force acting on the first one would be sum of forces from all other spheres. The total force would be: F =Gm^2/r^(1+1/4+1/9+1/25+...+1/n^2), which gives us F=Gm^2/r^2(PI^2/6). Why (according to existing theory) infinite mass causes finite gravity? I've got some solution, but becouse is in MathType, can send it only as attachement and would appreciate if someone could check it out. My email is: kkris1@yahoo.com

2006-12-03 17:01:31 · 6 answers · asked by kkris1 1

'The horizontal range,x, of a proiectile launched at an angle. degree, with the horizontal at an initial veiocitv, vi, can be determined by using:
x= (vi/g)*sin 2* degree
Prove that x has a maximum value when the degree is 45 degree. Give some examples.
sin 2* degree = 2 sin* degree* cos* degree.

i don't really know how to prove it, please show some examples

2006-12-03 17:00:08 · 2 answers · asked by Anonymous

Two grenades, A and B, are thrown horizontally with different speeds from the top of a cliff 70 m high. The speed of A is 2.50 m/s and the speed of B is 3.40 m/s. Both grenades remain in air for 3.77 s. Assume that the acceleration due to gravity is 9.86 m/s squared. What is the distance between A and B if they are thrown along the same straight line?


P.S. Please don't tell me to 'do my own hw.' If you don't want to help, don't. But don't say that cuz I would obviously do it if I understood it. Thanks.

2006-12-03 16:58:12 · 5 answers · asked by Anonymous

of 24.0 m/s as it passes over the top of a hill whose radius of curvature is 125m. The mass of the motorcycle and driver is 350 kg. Find the magnitude of the normal force that acts on the motorcycle.

What are the equations that one would use to solve this?

2006-12-03 16:21:04 · 5 answers · asked by larkinfan11 3

What horizontal range of a baseball that leaves the bat at an angle of 63 degree with the horizontal with an initial velocity of I60 km/h. Disregard air resistance.

2006-12-03 16:12:39 · 3 answers · asked by Anonymous

Ok, I have a test tommorow and I don't know how come mercury rises up to 76cm because of atmospheric pressure, what's the working(calculation). Help plz.

2006-12-03 16:04:21 · 4 answers · asked by Mike 4

If you dont like the conventional theory, give me your own.

2006-12-03 15:51:14 · 8 answers · asked by Master John 1

2006-12-03 15:47:23 · 5 answers · asked by Qasim 1

Best answer to whoever has the correct answer and best explanation.

A ball is launched with an initial velocity of 5m/s from a desk with a height of 1.647m above the ground at a 40 degree angle of elevation. How far from the point of launch will it land?

Note, air resistance can be neglected, but if you know a way to igure it in, that would help. If I am missing something needed to answer this, please tell me.

2006-12-03 15:27:10 · 4 answers · asked by Give me best answer 4

1) A rock is released from rest at the top of a 100-m-tall building. How long does the rock take to fall to the ground, and what is its imapact velocity. (*hint: we live on planet Earth where gravity (g=9.80 m/s^2).


2) A cannon ball is shot straight up with an inital speed of 100 m/s. How high does it go. (*hint: you need to use more than one formula because in order to get how high we need something else).


3) This problem is related to #2.
A ball is thrown vertically upward with a speed of 19.6 m/s.
a...What is the ball's velocity and its height after 1second? After 2 seconds? After 3 seconds? After 4 seconds? And after 5 seconds? (*hint: unlike the previous question, here you don't need to use an extra equation b/c I have given you time; where as in the previous question you needed to solve to time. But again, think of velocity of the ball at the very very very top for that split second.

b...Draw the ball's velocity-vs-time graph.
(remember the time is on the x-axis of the graph and velocity is on the y-axis of the graph). Let's make the time range from 0 seconds - 5 seconds.


4)
a...What constant acceleration, must a car have to go from zero to 26.82 m/s (60 mph) in 10 seconds?

b...How far has the car traveled when it reaches 60 mph?


5) Draw a free body diagram for the following:
-Book standing on top of the table.
-Dorian is pushing the book across the table where he exerts a force of 10N, make sure to include friction, which is opposite side of the motion/movement.
-You sit on the chair. Sum up the forces.
-You're pulling a sled with 15N of force applies and making an angle 30 degree.

6) Calculate your weight on (a)Planet Earth. (b)Planet Mars.

2006-12-03 15:11:52 · 2 answers · asked by i<3snow 1

i need to write h2o etc. the right way

2006-12-03 15:09:05 · 3 answers · asked by ? 1

If 30g of water at 5C are mixed with 50g of water at 70C and 25g of water at 100C, what is the final temperature of the mixture?

I know how to do this with 2 masses/tempertures, but I don't know how to do it with 3.

I also know aobut Q = mc/\t and that heat lost = energy gain, but again with 3, i'm clueless.

Thanks!

2006-12-03 15:05:59 · 3 answers · asked by alonso_fan85 1

A diver achieves a horizontal velocity of 3.75 m/s from a diving platform located 6.0 m above the water. How far from the edge of the platform will the diver be when he hits the water?

2006-12-03 15:05:42 · 3 answers · asked by Anonymous

A 40kg satellite circles the earth in an orbit with a period of 60 min. What minimum energy (in J) is required to change the orbit to another circular orbit with a period of 180 min?

I have to use: radius earth r=6.4EE6m mass earth M=6EE24kg
G=6.7EE-11 Nm^2/kg^2

I think I can assume that r becomes 3r even though an orbit isn't a circle. And the period T becomes 3T.

I know I need to use the formula for mechanical energy and also the formula for the period T^2=( 4pi^2/GM )r^3 but how do I figure out r first??
When I solve the last equation for r using T in seconds, I get 5091.24 km but this is less that the r of the earth so something is wrong.
Who can help, what am I not seeing??

2006-12-03 15:05:18 · 1 answers · asked by dutchess 2

THANKS! ; )

2006-12-03 15:02:42 · 1 answers · asked by feelingtherain 2

Find the acceleration of the child given that the coefficient of kinetic friction between the child and the slide is 0.400.

2006-12-03 15:01:39 · 3 answers · asked by Brittney 1

I am really bad with the whole tension force thing.

A rope with a breaking strength of 291 N supports a 470 N weight suspended from the middle of the rope. What is the minimum angle the rope can make with the horizontal without breaking?
Help would be greatly appreciated!

2006-12-03 14:45:10 · 2 answers · asked by strkrs4 2

2006-12-03 14:41:20 · 1 answers · asked by kishmyhelp 1

I need help on this problem:

Find the horizontal range of a baseball that leaves the bat at an angle of 63 degrees with the horizontal with an initial velocity of 160 km/h. Disregard air resisitance.

2006-12-03 14:36:59 · 1 answers · asked by Anonymous

I think I'm flat footed because my dad is but in fact I can see a small arch on my foot.

2006-12-03 14:30:38 · 5 answers · asked by Anonymous

1. A driver notices that her 1000kg car slows down 90 km/h to 70 km/h in about 6.0s on the level when it is in neutral. Approximately what power (watts and hp) is needed to keep the car traveling at a constant 80 km/h?

2. A shot putter accelerates a 7.3kg shot from rest to 14m/s. If this motion takes 2.0s, what average power was developed?


The answers from the book of the book for #1 is 2.1 x 10^4 W = 28 h, and #2 is 3.6 x 10^2 W.

I'm not sure how to get these answers so please show work and an explanation. Thanks so much!!

2006-12-03 14:16:48 · 1 answers · asked by hdwong58 3

2006-12-03 14:12:56 · 8 answers · asked by Anonymous

The effective coefficient of friction is 0.25

Any help appreciated... ASAP please.

2006-12-03 14:00:54 · 1 answers · asked by abc123 1