A mass vibrates back and forth from the free end of an ideal spring (k = 20. N/m) with an amplitude of 0.30 m. What is the kinetic energy of this vibrating mass when it is 0.30 m from its equilibrium position?
A) 1.4 J
B) 0.90 J
C) zero
D) 0.45 J
E) It is impossible to give an answer without knowing the object's mass.
C
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A student slides her 80.0-kg desk across the level floor of her dormitory room a distance 4.00 m at constant speed. If the coefficient of kinetic friction between the desk and the floor is 0.400, how much work did she do?
A) 128 J B) 3.14 kJ C) 26.7 J D) 1.26 kJ E) 24.0 J
Polaroid sunglasses reduce much glare by polarization axes that are
A) vertical. B) horizontal. C) at right angles to each other.
In this figure a ray of light is projected through glass at varied angles of incidence. Suppose a ray of light inside the glass is incident on the glass–air surface (bottom of glass) in a way that makes the ray on the air side emerge at nearly 90° with respect to the normal. If the angle of the light ray inside the glass hits the surface at an even greater angle relative to the normal:
a. the emerging light ray will have an angle less than 90° with respect to the normal. b. the light ray cannot escape the glass. c. there is no reflected ray within the glass. d. the refraction occurs at the complement of the angle calculated from Snell's law. e. the refraction occurs at the supplement of the angle calculated from Snell's law.
A 3.50-kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the same direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.