A 0.20-kg mass is oscillating on a spring over a horizontal frictionless surface. When it is at a displacement of 2.3 cm for equilibrium it has a kinetic energy of 1.5 J and a spring potential energy of 2.3 J. What is the maximum speed of the mass during its oscillation?
a. 4.4 m/s
b. 0.16 m/s
c. 6.2 m/s
d. 4.8 m/s
e. 3.0 m/s
c
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A plane, flying horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion
A) moves vertically. B) moves horizontally. C) is zero. D) moves along a parabolic path. E) remains in the plane.
If a current of 2.4 A is flowing in a cylindrical wire of diameter 2.0 mm, what is the average current density in this wire?
A) 7.6 × 105 A/m2 B) 5.2 × 10-6 A/m2 C) 1.9 × 105 A/m2 D) 3.6 × 105 A/m2 E) 21 × 10-6 A/m2
What is the name of the earthquake scale that gives an absolute measure of the energy released by an earthquake?
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