Which of the following materials has the slowest speed of light?
A) water
B) oil
C) air
D) flint glass
E) diamond
E
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A flat circular loop carrying a current of 2.0 A is in a magnetic field of 3.5 T. The loop has an area of 0.12 m2 and its plane is oriented at a 37° angle to the field. What is the magnitude of the magnetic torque on the loop?
A) 0.51 N ? m B) 0.67 N ? m C) 46 N ? m D) 0.10 N ? m
A 3.0-kg mass and a 5.0-kg mass hang vertically at the opposite ends of a rope that goes over an ideal pulley. If the masses are gently released from rest, how long does it take for the 3.0-kg mass to rise by 1.0 m?
A) 0.41 s B) 0.74 s C) 0.82 s D) 1.8 s E) 0.90 s
Molecular Bonds: In general, which of the following is usually the weakest bond?
A. hydrogen bond B. van der Waals bond C. ionic bond D. covalent bond
Consider a hoop of radius R and mass M rolling without slipping. Which form of kinetic energy is larger, translational or rotational?
A) Translational kinetic energy is larger. B) Rotational kinetic energy is larger. C) Both are equal. D) You need to know the speed of the hoop to tell. E) You need to know the acceleration of the hoop to tell.