Practice exam 1 · Fundamentals of Physics

Question 1Not yet answeredMarked out of 3.00Electromagnetic waves

Which of the following waves is electromagnetic?

SeismicInfraredSeaSound

Question 2Not yet answeredMarked out of 3.00Newton's laws

Which of the following scenarios applies to Newton's axiom I?

Decelerating carParked carAccelerating carCar colliding with a wall

Question 3Not yet answeredMarked out of 3.00Resonance

In which of the following system cases does resonance represent the greatest danger?

UndampedUnderdampedCritically dampedOverdamped

Question 4Not yet answeredMarked out of 3.00Imaging errors

Which among the following aberrations does not exhibit geometric imperfections?

AstigmatismChromatic aberrationComatic aberrationImage distortion

Question 5Not yet answeredMarked out of 3.00Polarization

In a double polarizing filter, the polarizer is inclined by 20 degrees counterclockwise. What should be the analyzer's inclination to allow two-thirds of light intensity to be transmitted?

15.26 degrees cw28.3 degrees cw15.26 degrees ccw28.3 degrees ccw

Question 6Not yet answeredMarked out of 3.00Transverse wave velocity

A wave whose amplitude equals its wavelength propagates at

1\ \mathrm{m/s}

. What is its maximum transverse velocity?

2\pi\ \mathrm{m/s}

\tfrac{\pi}{4}\ \mathrm{m/s}

\pi\ \mathrm{m/s}

\tfrac{\pi}{2}\ \mathrm{m/s}

Question 7Not yet answeredMarked out of 3.00Forced vibration

The critical frequency ratio of a damped system is

0.92

. By which percentage does the maximum steady-state amplitude exceed the amplitude at resonance?

0.020.080.060.04

Question 8Not yet answeredMarked out of 6.00Forced vibration

A spring-mass system (

k = 2000\ \mathrm{N/m}

,

m = 80\ \mathrm{kg}

) is subjected to a harmonic excitation

F(t) = 35\cos(10t)\ \mathrm{N}

. Determine, showing all details, the steady-state response of the system.

Question 9Not yet answeredMarked out of 8.00Imaging errors

A white squared box is seen from its side view (figure with cases a-d in the source). Each case may reflect one or a combination of optical aberrations. Associate for each case the probable optical aberration(s).

Question 10Not yet answeredMarked out of 10.00Elastostatics

A slender bar of length

50\ \mathrm{cm}

and

10\ \mathrm{mm} \times 15\ \mathrm{mm}

rectangular cross section is subjected to an axial force, such that its final length becomes

50.03\ \mathrm{cm}

. The material has

E = 70\ \mathrm{GPa}

and

G = 26.25\ \mathrm{GPa}

. Determine the applied force and the maximum shear strain developed in the bar.