Radioactivity Basics: Suppose that starting with 
, the following sequence of decays occurs: first an alpha decay, then a beta-minus decay, and finally another alpha decay. What isotope is left after each one of the decays?
What will be an ideal response?
Fr, 
Ra, 
Rn
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The sky is blue because
A) molecules scatter blue light more effectively than red light. B) molecules scatter red light more effectively than blue light. C) the Sun mainly emits blue light. D) the atmosphere transmits mostly blue light. E) the atmosphere absorbs mostly blue light.
A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
a. 30 J b. 62 J c. 20 J d. 44 J e. 24 J
Which of the following best describes the image of a convex mirror when the object's distance from the mirror is less than the absolute value of the focal point distance?
a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification greater than one
Buoyancy: An object weighs 7.84 N when it is in air and 6.86 N when it is immersed in water of density 1000 kg/m3. What is the density of the object?
A. 6000 kg/m3 B. 7000 kg/m3 C. 8000 kg/m3 D. 9000 kg/m3