Total # Posts: 13

Chemistry
10cm^3 of aa hydrocarbon was completely combusted in 200cm^3 of O2. It was found that there was 20cm^3 of O2 remaining and the volume of CO2 produced was 120cm^3. Determine the formula of the hydrocarbon.

Chemistry
10cm^3 of aa hydrocarbon was completely combusted in 200cm^3 of O2. It was found that there was 20cm^3 of O2 remaining and the volume of CO2 produced was 120cm^3. Determine the formula of the hydrocarbon.

physics
An atom absorbs a yellow photon in the transition from its 2s to its 3s state (see figure on the left, not drawn to scale). What color photon might it emit in a transition from the 3s to the 2p state?

Physics
The Cyclotron lab is not really designed to handle radioactive beams, but Briggsium is too weird to ignore. The physicists propose to generate it in a nuclear reaction immediately behind the accelerators, and are trying to see if they can get the beam all the way to the ...

Physics
A metal sphere of radius R = 28 cm carries a total charge Q = 0.5 microC. What is the magnitude of the electric field (in N/C) just outside the sphere?

Physics
Two charges are D = 1.5 m apart and lie on the x-axis. What must be the magnitude of the charge on the right one, Q2, (in C) so that the electric field is zero at x = 1.05 meters. Let Q1 be at the origin and have a charge 6 C.

Physics
Find the electric field (in N/C) at a point r =1.4 m above a point charge Q= -78 C. Take upwards to be positive.

Physics
Initially, you hear the siren at 90 dB. When the distance between you and the ambulance is a quarter of what it was initially, at what intensity level do you hear the siren? Assume that the siren is emitting sound equally in all directions.

Physics
A violin has an open string length (bridge to nut) of L=32.7 cm. At what distance x from the bridge does a violinist have to place his finger on the fingerboard to play a C (523.3 Hz) on the A string (fundamental frequency 440 Hz)?

physics
An ideal gas (volume 1.1m3 , pressure 101500 Pa, temperature 290 K) undergoes an isothermal process during which it absorbs 2000 J of heat. How much did the entropy of the system increase?

physics
In one cycle, a heat engine absorbs 4400 J at 500C and exhausts 400 J. How much work does it do per cycle?

reimbursement methodologies
Hi guys.I am working with this exam too right now and I don't understand how you guys can came up with... 1. A or B? What calculate did u guys used? 4. \$2500*20%. How that \$2500 from? 5. \$7000+\$2000. How that \$2000 from? Thanks a lot for the feedback.

Math
the scale on a drawing is 1/8"=1 foot.A horizontal line measuring 3-5/16"on the drawing would represent a length of(answer)feet.

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