Physics - March 2007

A ball is thrown at an angle of 53 degrees above the horizontal off the roof of a building with an initial speed of 15 m/s. Find the position and velocity of the ball at 1.0s, 2.0s and 4.0s after it was thrown (ignore air resistance) (x- components are horizontal y components are vertical)

What is the x, y, Vx, Vy and V for the ball at 1.0s, 2.0s and 4.0s

I used equation V=at+Vo to solve for V and X-Xo=.5(V+Vo)t to solve for x.

I got 9m/s for Vox, 12m/s for Voy, ax = -9.8m/s^2 and ax= 0m/s^2

Time = 1.0s, x = 9m, y = 7.1m, Vx= 9m/s, Vy =2.2m/s and V = 15 m/s

Time = 2.0s, x = 18m, y = 4.4m, Vx= 9m/s, Vy =-7.6m/s and V = 15 m/s

Time = 4.0s, x = 9m, y = -15.2m, Vx= 9m/s, Vy =-27.2m/s and V = 15 m/s



thanks

2007-03-02 01:30:14 · 3 answers · asked by Anonymous

circular motion

2007-03-02 01:24:34 · 7 answers · asked by shaque 1

You see an object traveling in a circular path at a constant speed

a) Could this be an object that is NOT interacting with anything else (no forces)? Explain.

b) Could this be an object that is experiencing only balanced forces (net force is zero)?

2007-03-02 01:00:20 · 5 answers · asked by Anonymous

point? The density of seawater is 1025 kg/m^3.

2007-03-02 00:51:58 · 4 answers · asked by Varun S 1

the torque on the shoulder joint if the arm is horizontal?

2007-03-02 00:43:53 · 1 answers · asked by Anonymous

work done as when it moves to the right?

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2007-03-02 00:29:32 · 3 answers · asked by Anonymous

2007-03-01 23:58:00 · 4 answers · asked by Brandon S 1

I have to calculate the force exerted by a moving object on a clamp. Force = Mass X Acceleration. the weight of the body is 10kg (weight!! not mass). distance travelled is 200 cm. time of travel is 2 seconds. I can calculate speed, how to calc acceleration?

2007-03-01 23:34:54 · 2 answers · asked by Jawa Dude 1

I am looking for an approximation here. I am assuming that the temperature change will be affected by the total surface area of water exposed to the warmer air.

I have a clear plastic container. It holds approximately 9 L of water. It is approximately cylindrical, maybe 30 cm in diameter

The water will be exposed to air at the top of the container.

I am also assuming that the starting temperature of the water will be approximately 2-5 C, and will finish at 22 C.

Can the specific heat of water be used to calculate the time needed?
What is the time needed to warm the water?
What is the physics and mathematics behind the solution?

I've studied both calculus and physics, but it has been so long that I can't remember how to do a calculation like this.

2007-03-01 23:21:45 · 2 answers · asked by Beam 3

* I heard today 2/3/07 in the arabic BBC news that sample of perfumes could be smelled via the internet for its advertisement in the near future.
*I thought about this idea months ago, But I decided it couldn't be, as the smell particals & molecules, which ther are tangeable should be transferred at the speed of light through wires & wireless waves.
***So I don't believe that will be satisfied.
** Imagine a galic advertisement smell may come out of your computer smell!! very stupid idea , isn't it?

2007-03-01 22:59:27 · 7 answers · asked by Anonymous

Please star this question if you find it thought provoking. Thanks

2007-03-01 22:19:04 · 4 answers · asked by Anonymous

2007-03-01 22:05:53 · 3 answers · asked by Robert O 2

when the lightning strucks whether it effects the line which giving 230v or both the current will send into the earth if it so how....

2007-03-01 21:46:19 · 1 answers · asked by Anonymous

2007-03-01 20:50:58 · 3 answers · asked by rjo_ong 2

2007-03-01 20:48:30 · 4 answers · asked by BillHou 1

I have heard plenty of good, valid and scientific reasons why people don't believe the official conspiracy theory regarding 9/11 (the one about 12 crazy Muslims outsmarting the entire US air force).

But I have yet to hear any good reasons as to why people support this theory. Have you actually read the 9/11 Commission Report, or are you just swallowing whatever your government feeds you without even looking into the facts?

Which one do you belive more: Your government, or the laws of physics as established by Isaac Newton?

Remember, no "pancake-theory" can explain a building (WTC 7) collapsing at free fall speed.

So how do you justify your strong stance against the laws of gravity? And if the government told you the earth was flat, would you believe that too?

2007-03-01 20:48:00 · 2 answers · asked by Anonymous

2007-03-01 19:29:51 · 4 answers · asked by jake 1

What is the inaccuracy of an ammeter?? plus/minus how many amps?

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i know gravity is an acctractive force between masses, but why!? why are masses attracted to each other?

2007-03-01 19:25:16 · 26 answers · asked by Anonymous

complete data of question:
a nitrogen nucleus N(A=14,Z=7) bombared with an alpha particle of a certain energy transmutes to an oxygen nucleus(A=17,Z=8) and a proton
a:write a equation for this nuclear reaction
b:find the minimum energy of alpha particle to make this reactin occur
(mass of nitrogen=2.32530*10^-26kg,mass of oxygen=2.82282*10^-26kg,mass of proton=0.16735*10^-26kg and mass of alpha particle=0.66466*10^-26kg)
attempt on this questin:
i have written the reaction
in second part we have to calculate mas defect for finding its energy by e=mc^2
in fission reaction i learnt that mass of reaction will always be greater than product,but here by calculation mass of product is greater ,why is this so.and plz tell me why energy equivalent to mass defect is always alpha particle energy why not other elements like nitrogen and oxygen
answer of this question is1.89*10^-13j,i have calculated this answer but that comes in negative as i subtracted reactants minus product

2007-03-01 19:07:21 · 5 answers · asked by ghulamalimurtaza 3

If earths curvature of its surface is 7.98 inches per mile. How can we see a boat that is 20 feet high go over the horizon and dissapear if that boat would have to be about 30 miles away to be able to see it dissapear. *btw my math might be off* also it depends on how far the human eye can see at sea level. If anyone knows how far the human eye can see in such conditions that would help as well.

2007-03-01 18:40:20 · 2 answers · asked by mysteri0_mask 1

a U(a=238,z=92) originally at rest decays spontaneously to form thorium and an alpha particle.no gamma rays is emitted
(a):the alpha particle emitted during decay travels a distance of 25mm in a cloud chamber.given that on average alpha particle creates 4 *raise to power 3 ions per mm of track in cloud chamberand energy required to poduce one ion pair is 4.8*raise to power -18 j.find kinetic energy with which alpha particle was emitted.
(b):hence deduce the initial velocities of alpha particle and thorium nucleus
c:calculate the difference between the rest masses of original uranium nucleus and sum of product of rest masses of products of decay
plz solve them for me
answers:
a:4.8*raise to power -13j
b:velocity of alpha:1.20*raise to power 7 m/s
velocity of thorium :2.05*raise to power 5 m/s
c:mass:5.42* raise to power -30 kg
plz post the complete process h did u solve this question

2007-03-01 18:08:08 · 6 answers · asked by ghulamalimurtaza 3

complete data:
two large horizontal plates are separated by 4mm .the lower plate is at a potential of -6v.what potential should be applied to upper plate to create an electric field strength of 4000 v/m upward in space between the plates
relavant equation:
E=v/d
attempt at question:
4000=v/0.004
v=16v
but the answer of this question is -22v
how it will be solved

2007-03-01 18:06:37 · 3 answers · asked by ghulamalimurtaza 3

2007-03-01 17:21:15 · 3 answers · asked by goodboywolf 1

In the hydraulic machine shown, it is observed that when the small piston is pushed down 7 cm, the large piston is raised 1 cm. If the small piston is pushed down with a force of 105 N, how much force is the large piston capable of exerting?

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what would you call a super smart Scientist?

2007-03-01 16:44:28 · 14 answers · asked by mikedrazenhero 5

hi..can u plz help me with my report?
what is the formula for volume expansion?
and can u explain it?

2007-03-01 16:40:56 · 1 answers · asked by Anonymous

Okay, so my class is working on Newton's third law. Along with this, our teacher gave us an example of a boy who stands on a scale. The boy weighs 1000 N and he is holding a dumbell in his hands of 50 N. We need to find out why the scale reads 1050 N instead of just 1000. He wanted us to explain why the force of the boy's hand holding up the dumbell at 50 N wouldn't cancel out the dumbell's weight, and none of us knew the answer. Please help me understand!

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