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Question1
The overall gain of an STM controller is 10000x (equivalent to40dB, where dB=10log10) at low frequencies. If piezo resonance occurs at 10 kHz, what is utmost 3dB bandwidth of the amplifier (the frequency at which the gain of the amplifier has fallen by 3 dB from its DC gain)? (The gain falls 2x or -3bB per octave for a plain RC circuit like the integrator in an STM). To do this figure out how several octaves below 10 kHz one should go to get to the full gain, then double frequency to find the -3dB point (this is how the bandwidth of amplifiers is generally specified.)
Question2
Operated in constant height mode, the STM forms a current image by recording current as the probe is scanned over a surface. A probe, 2A above a gold surface, consists of a double tip, with a second atom 0.25A higher than lowest atom (which is the one 2A above the surface) gives a ‘ghost’ image displaced from key image. What is relative intensity of this ghost image?
Illustrate what was the impact on Mosby's 2012 net income as a result of this fair value hedge of a firm commitment?
A particle moving along a 2-d x-y plane has its velocity described by the functions: Vx=2t^2, what is the acceleration of the particle
A soccer player kicks the ball toward a goal that is 16.0 m in front of him, Find the speed of the ball when the goalie catches it in front of the net
An attacker at the base of a castle wall 3.63 m high throws a rock straight up with speed 8.80 m/s at a height of 1.51 m above the ground. Find the change in speed of a rock
A motorist travelling at 82 km/hr is being chased by a police car at 131 km/hr. If the police car starts from 3.5 km back, how long does it take to catch the motorist? Leave time in hours.
A convex mirror has a focal length of -30.0 cm. A 15.0-cm-tall object is located 30.0 cm in front of this mirror. determine the location and size of the image
A parachutist leaves a stationary plane and free falls for 50.0 meters (ignore air resistance for the free fall). At what height did she leave the plane
In a series LRC AC circuit, the resistance is 19 Ohm, the inductance is 21 mH, and the capacitance is 14 micro Farads. Calculate the max current in the circuit
Mary applies a force of 70 N to push a box with an acceleration of 0.49 m/s2. When she increases the pushing force to 80 N, What is the mass of the box
The Earth is constantly being bombarded by cosmic rays, which consist mostly of protons. what is the total charge incident on the atmosphere
Water at a gauge pressure of P = 3.4 atm at street level flows into an office building at a speed of 0.90m/s through a pipe 5.6 cm in diameter. find the gauge pressure in the pipe on the top floor
A 3.00kg stone is sliding to the right on a frictionless horizontal surface at 5.50m/s when it is suddenly struck by an object that exerts a large horizontal force on it for a short period of tim, What impulse does this force exert on the stone
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