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A submarine can stand a pressure of
1400 KN/m2
above atmospheric
pressure. Find the maximum depth at
which she can work in sea water of RD
= 1.025.
A person is 1.7 m height and in a bending position experiences upward acceleration. If the blood pressure difference between the brain and the heart is 8.8 kPa, what is the acceleration that he was experienced? (rblood = 1.1 g/cm3, height difference between heart and brain is 40 cm).
A stone is thrown vertically upward it took four seconds to return to the ground how high does the stone go?
What mass will push on a lever 80cm long. If the moment of 56.96Nm is caused about it's centre shaft?
2. A spring-mass system consisting of m = 2 kg and spring constant k = 50N/m is executing simple harmonic motion with amplitude of 0.9 m. (a) Calculate the total mechanical energy of the oscillator (b) What is the maximum velocity of the mass (c) For what value(s) of displacement will the oscillator have maximum kinetic energy ? (d) For what value(s) of displacement will the oscillator have maximum potential energy ? (e) If the oscillator is subjected to a mild damping force b= 0.07 kg/s find the time constant for the damped oscillator.
Find the sum of two vectors A=5m<60°and B=6m<130°
Three charges A(4 µC), B(-6 µC) and C(2 µC) are placed at the vertices of a right angle triangle ABC. AC=10 cm, BC=6 cm. Find net force on charge B due to C and A charges
6. Three point charges are fixed at the corners of a right triangle. What is the electric force on the +1.0-pC chargedue to the other two charges?
A person has a mass of 70 kg. What is this persons weight? What is the force that this person exerts onto earth? Why is the earths acceleration because of this person?
The amount of a uniformly distributed radioactive contaminant
contained in a closed reactor is measured by its concentration c
(becquerel/liter or Bq/L). The contaminant decreases at a decay
rate proportional to its concentration—that is
decay rate = −kc
where k is a constant with units of day−1. Therefore, according to
Eq. (1.13), a mass balance for the reactor can be written as
dc
dt
= −kc
change
in mass
=
decrease
by decay
