Monday
December 22, 2014

Posts by Dia


Total # Posts: 15

MATHS HELP plz!!
A parcel in the form of a rectangular block is held together by three pieces of tape as shown in the diagram . The parcel has square ends of side x cm and is y cm in length. Express the total length of tape in terms of x and y. Given tat the total length of tape is 450 cm, ...
December 4, 2014

MATHS HELP plz
A parcel in the form of a rectangular block is held together by three pieces of tape . The parcel has square ends of side x cm and is y cm in length. Express the total length of tape in terms of x and y. Given tat the total length of tape is 450 cm, express the volume, V cm3 (...
December 4, 2014

physics
A 74.0kg person is put on an exercise program by a physical therapist, the goal being to burn up 550 food calories in each daily session. Recall that human muscles are about 21.0% in converting the energy they use up into mechanical energy. The exercise program consists of a ...
October 4, 2014

physics
You overindulged on a delicious dessert, so you plan to work off the extra calories at the gym. To accomplish this, you decide to do a series of arm raises holding a 5.5kg weight in one hand. The distance from your elbow to the weight is 36cm , and in each arm raise you start ...
October 4, 2014

CALCULUS
I need to find the unit normal vector given: r(t)= ti + (6/t) j where t= 3 I know I need to find the unit tangent vector first, which is r'(t) divided by the magnitude of r'(t). r(t) can be rewritten as ti+ 6t^-1 r'(t) = i- 6t^-2 = i- [6/ (t^2)] j For the magnitude...
September 28, 2014

chemistry
At a constant pressure, the volume of a gas is increased from 150.0 L to 300.0 L by heating it. If the original temperature of the gas was 20.0 degrees C, what will its final temperature (in Kelvin) be?
February 24, 2012

Physics
A cylinder contains the helium gas with a volume of 0.1 m3 at a pressure of 220 kPa. The gas is compressed to a volume of 0.02 m3. The process is adiabatic and the specific heat ratio of the gas is 1.66. Determine (a) the pressure in the cylinder after compression; (b) work ...
December 18, 2011

Physics
A horizontal spring is fixed at one end, then stretched 3.0 cm by a force of 6.0 N. Afterwards, a 0.50 kg body is attached, pulled 2.0 cm from its rest position, and released. Find (a) spring constant, (b) angular frequency, (c) frequency and (d) period.
December 18, 2011

Physics
The position of a body moving in simple harmonic motion is given by m t x       + = 4 9 cos 3 π . For this motion, what are the (a) amplitude, period...
December 18, 2011

Physics
Thanks i will do the rest
December 18, 2011

Physics
A block has mass 800 g, whose is fasten to a spring with spring constant k is 70 N/m. The block is pulled a distance x = 15 cm from its equilibrium position at x = 0 on a frictionless surface and released from rest at t = 0. (a) What force does the spring exert on the block ...
December 18, 2011

physics
What is the acceleration for the turtle moving with constant velocity of 5m/s to tghe right
October 26, 2011

Physics
A man walks 40 m @ 30 degrees N of E, then 70 m @ 60 degrees S of E and finally 20 m @ 45 degrees N of W. What is the displacement of the man?
June 14, 2011

space
why we don't see comets until they are mear the sun?
May 14, 2008

space
why is looking through a powerful telescope like looking back through time?
May 14, 2008

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