Princess Sophie E

7 Questions
22 Answers

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Physics

The time base of a cathode ray oscilloscope (CRO) is set 1ms/cm. When an alternating current signal of 200Hz is applied to the y-plate of the CR0, what is the minimum number of cycles seen on the 30cm wide screen?

Princess Sophie E Mar 25, 2014

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1540

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The electrostatic force between two charges Q1 and Q2 at a distance r apart is given by F=(Q1Q2)/(4PieEo*r^2). What is the unit of E?

The electrostatic force between two charges Q1 and Q2 at a distance r apart is given by F=(Q1*Q2)/(4Pie*Eo*r^2). What is the unit of E?

Princess Sophie E Mar 25, 2014

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1093

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Complex numbers

In an argand diagram, P represents the complex number such that {Z:3|Z+3|=|Z+4i|}
show that P lies on the circle and find
a)the radius of the circle
b)the complex numbers represented by the centre.

Princess Sophie E Feb 21, 2014

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1166

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Projectiles

A projectile is fired with initial velocity 5umeters/second at an angle of projection tan inverse of (4/3).
The projectile is halfway below its maximum height at times t1 and t2.
Show that:
a) t1 + t2 = (8u/g)
b) t1* t2 = (8u^2/g^2) <read more ..

Princess Sophie E Feb 12, 2014

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Forces

A ladder rests with its foot on smooth horizontal ground and its upper end against a smooth vertical wall.
The ladder is uniformed and weighs 300N and inclined to the wall at an angle x. What horizontal force must be applied to the foot of the ladder read more ..

Princess Sophie E Feb 5, 2014

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1013

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Forces

A ladder rests with its foot on smooth horizontal ground and its upper end against a smooth vertical wall.
The ladder is uniformed and weighs 300N and inclined to the wall at an angle x. What horizontal force must be applied to the foot of the ladder read more ..

Princess Sophie E Feb 5, 2014

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2044

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Math

A uniform ladder of weight w rests on rough horizontal ground against a smooth vertical wall. The vertical plane containing the ladder is inclined at an angle x to the vertical. Prove that if the ladder is on the point of slipping and U is the coefficient read more ..

Princess Sophie E Jan 24, 2014

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roro wrote: cos(a)=-0.4558
find a.

cos(a)=-0.4558
a=cos^-1(-0.4558)
=> a=117.1164195

Princess Sophie EMar 25, 2014

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Tibbers wrote: What is the area of a rectangle with a length of 3.4 meters and a width of 1.7 meters?

Well the area of a rectangle=length*width
=> A=l*w
=> A=3.4m*1.7m
=> A=5.78m^2

Princess Sophie EMar 3, 2014

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TheMathNoobster wrote: What is 1+1? i never have seemed to crack this one, its a real toughie.

Have you heard of the machine called a calculator, try using it.

Princess Sophie EFeb 22, 2014

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happyfeet wrote: what is the answer to the square root of -16?

The square root of a negative number does not exist.
So square root of -16=undefined.

Princess Sophie EFeb 22, 2014

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adsfafsd wrote:14+s=16

14+s=16
s=16-14
s=2

Princess Sophie EFeb 22, 2014

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max escribió: was ist die wurzel aus 100?

Quadratwurzel von 100 = 10

Princess Sophie EFeb 22, 2014

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Jesus Alejandro escribió: El Perímetro de una cancha de fútbol es 320 metros, si el ancho mide 36 metros ¿cuanto mide el largo?

Ok Perímetro = (largo + ancho) * 2 => P = 2largo + 2ancho
dejar metros = m sabemos que:
P = 320m
ancho, a= 36m largo, l=?
Por lo tanto,
=> 2l = P-2a
=> 2l = 320m-2 (36m)
=> 2l = 320m-72m => 2l = 248m
=> l = 248m / 2
=> l = 124m
de largo, l = 124 metros.

Princess Sophie EFeb 22, 2014

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bassboy66 wrote: 8+2/z=10.
I guess we need to look for the value of z.
=>(8+2)/z=10
multiply both sides by z gives
((8+2)/z)*z=10*z
=>8+2=10z
=>10=10z
=>z=1

Princess Sophie EFeb 21, 2014

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NunezErika wrote : How do you find the volume of a cylinder?
To get the volume of a cylinder use the formula:
volume=Pi*r^2*h
where
Pi=approximately 3.142,
r=radius of circular end of cylinder and
h=height of the cylinder.

Princess Sophie EFeb 21, 2014

+72

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Mathisfun wrote: 7.77x+ 49=60.3729+7x what is x?
Ok 7.77x+49=60.3729+7x
taking like terms on oneside gives
=> 7.77x-7x=60.3729-49
=>0.77x=11.3729
=>x=(11.3729)/(0.77)
=>x=14.77

Princess Sophie EFeb 21, 2014