A +5.0-nC point charge is placed 2.0 cm away from an infinite planar sheet. The sheet is uniformly charged with -1.0 nC/cm2 .a) Calculate the strength and show the direction of the electric force acting on the point charge.b) Determine the location(s) where the net electric field vanishes.

Pictured below the first three harmonics of sound waves in a closed-open ended pipe.If the pipe length is 50cm or 0.5m long (rough size of a normal clarinet), what are the wavelengths and frequencies of the 3 pictured modes (m= 1, 3, 5), assuming it is filled with air?a. l =f=b. l =f=c. l=f=d. Can the relationship between any two of these modes be described […]

0.2 m of air at 20C and 100 kPa is compressed by the piston in an engine cylinder that has a compression ratio of 6:1. Heat is then added whilst the pressure remains tha same, until the piston returns to its original position. Sketch these processes on a p-V diagram and calculate:A. mass of air,B. pressure at the end of the compression,C. final temperature,D. nett […]

when an electron moves from the n=6 stationary state to the n=1 state in a HELIUM ion, it loses 5.439×10^1 eV of energy.a)what is the energy in joules?b) what is the frequency of the photon that is emitted in this process?c) what is the wavelength of this light in nm?

A +5.0-nC point charge is placed 2.0 cm away from an infinite planar sheet. The sheet is uniformly charged with -1.0 nC/cm2 .a) Calculate the strength and show the direction of the electric force acting on the point charge.b) Determine the location(s) where the net electric field vanishes.

Pictured below the first three harmonics of sound waves in a closed-open ended pipe.If the pipe length is 50cm or 0.5m long (rough size of a normal clarinet), what are the wavelengths and frequencies of the 3 pictured modes (m= 1, 3, 5), assuming it is filled with air?a. l =f=b. l =f=c. l=f=d. Can the relationship between any two of these modes be described […]

0.2 m of air at 20C and 100 kPa is compressed by the piston in an engine cylinder that has a compression ratio of 6:1. Heat is then added whilst the pressure remains tha same, until the piston returns to its original position. Sketch these processes on a p-V diagram and calculate:A. mass of air,B. pressure at the end of the compression,C. final temperature,D. nett […]

A nearby lawnmower has an intensity of about 10-2 W/m2.What is this in dB?If the mower is 2m away, how much sound power is it producing? (in Watts)Using the hearing chart (the one with phone lines), compare the dB of the mower at 102, 103, and 104 Hz. At which of these three frequencies is the mower perceived as loudest?d. A dog next door to […]

Below are the first 4 harmonics (standing waves) of a string fixed at both ends.a. In the space immediately above, draw what the 5th harmonic would look like, labelling with an N all of its nodes and A for its antinodes.b. IfL=2m andf1 =200Hz(i.e.thefrequencyofm=1),whatisthefrequencyofm=5?c. Using the first harmonic (m=1), calculate the speed of waves on the given string.d. If the string above became more tense, […]

8. A driver sees an accident ahead and applies the brakes so the 1000 kg car comes to a stop.a. Sketch a force diagram in the space at right showing all forces acting on the car. (2 points)b. Calculate the Force of the Earth on the car and use it to determine the normal Force of the Road on the car. Hint: The Force of […]