# Yahoo Web Search

1. ### A 71.0 −kg person stands on a scale in an elevator. I found (a,b,and c ) but about (d,e,f,g,h,i,and j ) help me?

...h) mass should still be mass i) F = 71 kg * (9.81 m/sec^2 - 3.8 m/sec^2) j ) mass should still be mass.

1 Answers · Science & Mathematics · 23/02/2016

2. ### A 190 N child is in a swing that is attached to ropes 2.00 m long. Find the gravitational potential energy of?

190 * (2 - (2 cos(28 degrees))) = 44.5 J For this problem, its really asking you to find the height "h" the child has traveled once s/he swung...

1 Answers · Science & Mathematics · 05/04/2009

3. ### A 1700 kg elevator accelerates upward at 1.10 m/s^2 for 15.0 meters, starting from rest.?

... = distance * force F = ma 15 [m] * (1700 * 1.1) [ N ] = Work [Nm] Gravity is not... the work = kinetic energy 15 * (1700*1.1) = 28 050 J However, you could calculate it without using...

1 Answers · Science & Mathematics · 18/03/2013

4. ### Force F = (-9.0 N )i + (5.0 N ) j acts on a particle with position vector r = (-1.0 m)i + (2.0 m) j ?

... are in the same plane (i-hat and j -hat), we know that the cross product will be in the...that it asks the torque before the angle, but whatever. Angle can be found by making little triangles out...

1 Answers · Science & Mathematics · 16/06/2012

5. ### There are two forces on the 1.4 kg box in the overhead view of?

...ph from the horizontal. The second force is unknown, but can be found using vectors. Let's set the angle of the... that, solve for F2 and check both equations. j

2 Answers · Science & Mathematics · 24/09/2007

6. ### Find two unit vectors that are orthogonal to both j +2k and i-2j+3k?

...be n = ai + bj + ck Then require n dot ( j + 2k) = b + 2c = 0 And n dot (i - 2j + 3k) = a - 2b + 3c = 0 First eq...(54) Using each possible c , go back and find the corresponding a & b. The two...

3 Answers · Science & Mathematics · 15/12/2010

7. ### In opening a door, a 30.4 N force is applied as shown in the figure below. Find the torque produced by this fo?

... found by rFsinθ. torque is also found by Iα when using a rotational analogy, but that doesn't apply to this case. torque is... (not to be confused with a J )

2 Answers · Science & Mathematics · 21/06/2010

8. ### A hydrogen atom emits light of wavelength 121.54 nm. Find the value of the quantum number n for the initial st?

...64 * 10^-18 J ) / (1.602 * 10^-19 J /eV) ≈ 10.2 eV This... about the energy difference between n = 2 and n = 1. I was... into the calculations, but I decided to cut it out...

1 Answers · Science & Mathematics · 26/06/2011

9. ### An electromagnetic wave has a oscillating magnetic field with maximum value 7.03 mT. Find energy density in the region of this wave in J /m^3?

... J /m³ ◄ maybe this But I suspect they also want...7.03e-3T = 2.11e6 N /C and then ωe...)² = 19.7 J /m³ -- how 'bout...probably this If you find this helpful, please award ...

1 Answers · Science & Mathematics · 15/11/2017

10. ### How to find limit of sequence n !/ n ^10?

...gt; 1000, n ! / n ^1000 = ( n -1000)!•Π[ j =0,999] ( n - j )/ n = ∞•1 3. F: Correct -- As n ... down on any value. So it diverges, but is bounded. 6. Z: Correct...

2 Answers · Science & Mathematics · 15/04/2012