search
Log In
0 votes

A mobile phone has a small motor with an eccentric mass used for vibrator mode. The location of the eccentric mass on motor with respect to center of gravity (CG) of the mobile and the rest of the dimensions of the mobile phone are shown. The mobile is kept on a flat horizontal surface.

Given in addition that the eccentric mass $= 2$ grams, eccentricity $= 2.19 \: mm$, mass of the mobile $= 90$ grams, $g = 9.81$ $m/s^2$. Uniform speed of the motor in RPM for which the mobile will get just lifted off the ground at the end $Q$ is approximately

  1. $3000$
  2. $3500$
  3. $4000$
  4. $4500$
in Applied Mechanics and Design 24.6k points
recategorized by

Please log in or register to answer this question.

Answer:

Related questions

0 votes
0 answers
Air ($\rho$=$1.2 \: kg/m^3$ and kinematic viscosity, $V$ = $2 \times10^{−5}$ $m^2$/$s$) with a velocity of $2$ $m/s$ flows over the top surface of a flat plate of length $2.5$ $m$. If the average value of friction coefficient is $C_f=\dfrac{1.328}{\sqrt{Re_x}}$, the total drag force (in $N$) per unit width of the plate is _______
asked Feb 24, 2017 in Applied Mechanics and Design Arjun 24.6k points
0 votes
0 answers
Temperature of nitrogen in a vessel of volume $2$ $m^3$ is $288$ $K$. A U-tube manometer connected to the vessel shows a reading of $70$ $cm$ of mercury (level higher in the end open to atmosphere). The universal gas constant is $8314$ $J$/$kmol$-$K$, atmospheric pressure is ... $m$/$s^2$ and density of mercury is $13600$ $kg$/$m^3$. The mass of nitrogen (in $kg$) in the vessel is _____________
asked Feb 24, 2017 in Applied Mechanics and Design Arjun 24.6k points
0 votes
0 answers
A horizontal plate has been joined to a vertical post using four rivets arranged as shown in the figure. The magnitude of the load on the worst loaded rivet (in $N$) is _______
asked Feb 24, 2017 in Applied Mechanics and Design Arjun 24.6k points
0 votes
0 answers
A precision instrument package $(m = 1 \: kg)$ needs to be mounted on a surface vibrating at $60 \: Hz$. It is desired that only $5\%$ of the base surface vibration amplitude be transmitted to the instrument. Assume that the isolation is designed with its natural frequency ... $N/m$) of the required mounting pad is _____
asked Feb 24, 2017 in Applied Mechanics and Design Arjun 24.6k points
0 votes
0 answers
...