Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the rotational inertia of this rigid body about an axis that passes through the mid-points of the longer sides and is parallel to the shorter sides?
a. 2.7 kg/m2
b. 3.6 kg/m2
c. 3.1 kg/m2
d. 4.1 kg/m2
e. 1.6 kg/m2
b
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According to the turn-off points of the oldest globular clusters, they are about
A) 4.5 billion years old. B) 6.8 billion years old. C) 10 billion years old. D) 12 billion years old. E) 16 billion years old.
A particle (mass = 6.0 mg) moves with a speed of 4.0 km/s in a direction that makes an angle of 37° above the positive x axis in the xy plane. At the instant it enters a magnetic field of (5.0 ) mT it experiences an acceleration of (8.0 ) m/s2 . What is the charge of the particle?
a. ?4.8 ?C b. 4.0 ?C c. ?4.0 ?C d. 4.8 ?C e. ?5.0 ?C
Two objects approach each other with velocities such that the total momentum of the masses is zero kg?m/s, and undergo an elastic collision. Is the sum of the kinetic energies of each object the same before and after the collision?
What will be an ideal response?
If the rest wavelength of a certain line is 600 nm, but we observe it at 594 nm, then
A) the source is getting 1% hotter as we watch. B) the source is spinning very rapidly, at 1% of the speed of light. C) the source is receding from us at 10% of the speed of light. D) the source is approaching us at 1% of the speed of light. E) the source is approaching us at 0.1% of the speed of light.