# Posts by Dia

Total # Posts: 17

math
a plumber cuts two short pieces of pipe each 37 centimeters long from a piece of pipe that is 1 meter long. how much pipe is left after cutting the two pieces?

Science
Which of the following statements is not true of using electron dot diagrams? A. The element's group number provides a clue about the number of valence electrons. B. An element with eight valence electrons is chemically unstable. C. Dots should be placed one at a time on ...

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, ...

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 (...

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 ...

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 ...

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...

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?

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 ...

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.

Physics
The position of a body moving in simple harmonic motion is given by m t x ï£· ï£¸ ï£¶ ï£¬ ï£­ ï£« + = 4 9 cos 3 Ï€ . For this motion, what are the (a) amplitude, period...

Physics
Thanks i will do the rest

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 ...

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

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?

space
why we don't see comets until they are mear the sun?

space
why is looking through a powerful telescope like looking back through time?