Which of these is a scientific hypothesis (that could be proved wrong)?
A) atoms in proper proportions make us feel good
B) atoms are in all the stars in the universe
C) an atom is the smallest bit of matter in a material
D) none of the above
Answer: C
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An ice skater has a moment of inertia of 5.0 kg ? m2 when her arms are outstretched, and at this time she is spinning at 3.0 rev/s. If she pulls in her arms and decreases her moment of inertia to 2.0 kg ? m2, how fast will she be spinning?
A) 7.5 rev/s B) 3.3 rev/s C) 10 rev/s D) 2.0 rev/s
A yellow candle flame reflects from opposite surfaces of a piece of red glass
A) both images are yellow B) one image is yellow and the other red C) both images are red D) both images are reddish yellow
When an electron is removed from a neutral atom, it becomes
A) a positive ion. B) a negative ion. C) heavier. D) a bipolar atom. E) more massive.
An air track cart with mass m and speed v moving along an air track collides with a stationary cart with a mass m/3. After the collision the first cart has a speed v/2. Is the collision elastic?
What will be an ideal response?