Which of the following is a scientific statement?
A) the Moon is made of green cheese
B) matter is filled with undetectable particles
C) there are parts of the universe that will never be found by humans
D) none of the above
Answer: A
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A 0.20-kg mass is oscillating on a spring over a horizontal frictionless surface. When it is at a displacement of 2.3 cm for equilibrium it has a kinetic energy of 1.5 J and a spring potential energy of 2.3 J. What is the maximum speed of the mass during its oscillation?
a. 4.4 m/s b. 0.16 m/s c. 6.2 m/s d. 4.8 m/s e. 3.0 m/s
A figure skater with arms initially extended starts spinning on the ice at 3 rad/s. She then pulls her arms in close to her body. Which of the following results?
a. a smaller rotational rate b. a greater rotational rate c. a greater angular momentum d. a smaller angular momentum
You hit a handball too hard, and it lands horizontally on top of a roof. If its original velocity was vo at an angle ? above the horizontal, then it lands on the roof with a velocity of
A) vo sin ? B) 2vo C) vo cos ? D) zero E) vo
The difference between the highest and lowest voltage of a household "120 V emf" is
A. 120 V. B. 170 V. C. 240 V. D. 340 V. E. 377 V.