Recent content by blaziken's_charizard

t = s/u s = 10m u = 14cos.\theta m/s [horizontal velocity vector] so, t = 10 / 14cos.\theta then, s = u.t + 1/2.a.t^2 5 = (14sin\theta * 10/14cos\theta) + 1/2.(-9.8).(10/14cos\theta)(10/14cos\theta) Please excuse the absence of units- including them would make it so much more...

1. A boy can throw a stone at 14 m/s. At what angle must he throw it in order to hit a window which is 10m away horizontally and 5m above the ground? 2. I would assume we have to use trig ratios and the kinematics equations. v = u + a.t v^2 = u^2 + 2.a.s s = u.t + 1/2.a.t^2 3. Diagram: (see...

The angle will be 16.9 degress... so therefore no TIR occurs >_> Thanks. This was an exam question. I therefor got it wrong ;_; I drew the normal in the wrong place.

Ok... so it makes 28.1 degress... I think that the 90 degrees will be cut in half by the normal making a 45 degree angle in the triangle formed. The problem now is that I can't identify where the angle is going to be formed with the normal...

But you see the angle 28.1 isn't the incident angle made by the ray when its leaving the slow medium for the fast medium (glass => air). I have to somehow find this incident angle, or so I assume >_> I hope to god it's not trigonometry, but I have a feeling it is as such V_V

http://img210.imageshack.us/img210/6094/questionuz8.png i) What is the angle of refraction of the ray RS after it strikes the glass prism of refractive index=1.5? ii) If the critical angle is 41.8 degrees, deduce whether the ray will suffer total internal reflection. 2. Homework Equations ...

An increase in temperature of the air causes density to decrease in that the molecules move faster thus taking up more space [mass] per unit volume. And thanks a lot for your help :) !

If they were all at 10oC then the answer would still be D [the one with the most mass?] The root cause is the decrease density; the more dense air displaces the less dense air resulting the more dense air 'sinking' and the less dense air 'rising. The gaps are there because when the trains...

1. The speed of a body of mass, m, moving horizontally, increases from u to v over a distance, d, under the influence of a constant resultant force, F, in the direction of motion. The energy transferred to the body is: 1. Fd 2. m/2*(v^2 - u^2) 3. 1/2*(mv)^2 The options are: 1 only, 2 only, 1 &...

Thank you very much.

So could it be: a) Weight of man (assuming g=10m/s^2)= 75*10=750N Net force= force * acceleration However, since there is a constant velocity, there would be no acceleration. Therefore: Net force= 750*0= 0N Since there is no unbalanced force resulting in an acceleration, the force that...

1. Explain why the weight of a body changes if it is taken form the equator to one of the poles 2. With Reference to Newton’s Laws of Motion, determine the force that a man of mass 75.0kg exerts on the bottom of an elevator when it is a. Ascending with a constant velocity of 2.5m/s b...

So questions 7 for the T/F is TRUE... I still haven't figured out the question with the marble. I am guessing that it's 0.1 J using: 0.01kg * 1m * 10ms^-2 =0.1J? Is that correct?

So here are the final answers after considering what you've helped me with. I still haven't figured out some [the unanswered ones]. Yes, it's radon gas. I looked it up. Also, Carbon 14 is also known as 146C, so I got that one too. I need help with the others... I don't know if all the...

1. In a vacuum, a feather will not fall at the same rate as a stone FALSE 2. Free Fall and The Pendulum Swing are not the only methods that can be used to determine the value of gravity.. FALSE 3. The equation s = ½ (v + u)t is not an accurate equation TRUE 4. If a body is project...