SELF ASSESSMENT EXERCISE No.1

1. A spring is compressed 30 mm by a force of 50 N. Calculate the spring constant. (1.67 N/mm)
2. A mass of 30 kg is accelerated at a rate of 4 m/s2. Calculate the force used to do it. (120 N)
3. A flywheel is accelerated at a rate of 4 rad/s2 by a torque of 10 Nm. Calculate the moment of inertia.
(2.5 kg m2)
4. A force of 5000 N acts on an area of 400 mm2. Calculate the pressure in Pascals. (12.5 MPa)
5. A pipe 100 mm diameter carries oil at a mean velocity of 2 m/s. Calculate the flow rate in m3/s.
(0.0157 m3/s)
6. The current in an inductive coil changes at 30 A/s and the back emf is 3 V. Calculate the inductance
in H. (0.1 H)
7. A capacitor has a charge of 2 Coulombs at 24 V stored on it. Calculate the capacitance in mF.
(83.3 mF)
8. A flywheel turns 120 radians in 3 seconds at a constant rate. Calculate the angular velocity. (40 rad/s)