# Posts by Nadya

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.