An object moving at a constant speed requires 6.0 s to go once around a circle with a diameter of 4.0 m. What is the magnitude of the instantaneous acceleration of the particle during this time?
a. 2.2 m/s2
b. 2.7 m/s2
c. 3.3 m/s2
d. 3.8 m/s2
e. 4.4 m/s2
A
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Two vehicles with equal magnitudes of momentum traveling at right angles to each other undergo an inelastic collision. The magnitude of momentum for the combined wreck is
A) the same as the magnitude of momentum of either car before collision. B) less than the magnitude of momentum of either car before collision. C) greater than the magnitude of momentum of either car before collision. D) none of the above
Earthquake waves are classified as P waves and S waves. Which of the following statements is true about these waves?
a. The P wave is transverse as is the S wave. b. The P wave is longitudinal as is the S wave. c. The P wave is transverse and the S wave is longitudinal. d. The P wave is longitudinal and the S wave is transverse. e. Both the P and S waves are mixtures of longitudinal and transverse waves.
Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.5 m × 4.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the shorter sides and is parallel to the longer sides?
a. 2.2 kg/m2 b. 2.8 kg/m2 c. 2.5 kg/m2 d. 3.1 kg/m2 e. 1.6 kg/m2