A ball is tossed upward. Neglecting air drag, the acceleration along its path is
A) 0 g.
B) g downward.
C) g upward.
D) g upward, then g downward.
E) none of the above
Answer: B
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In the late 18th century, two astronomers, both with the last name of _______________, were the first to attempt to map the shape of the galaxy
Fill in the blank(s) with correct word
Radioactive Decay: Time (days)026111930Counts per Minute1000899726556356200In a laboratory accident, a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and obtain the data shown in the table. The accident occurred at time t = 0 days. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 16 counts per minute. Of the choices listed, which one is the earliest time after the accident that workers could safely return?
A. 77 days B. 90 days C. 102 days D. 65 days E. 48 days
An oxygen molecule falls in a vacuum. From what height must it fall so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 800 K?
(The Boltzmann constant is 1.38 × 10-23 J/K, the molecular weight of oxygen is 32.0 g/mol, and Avogadro's number is 6.022 × 1023 molecules/mol.) A) 31.8 km B) 10.6 km C) 21.1 km D) 42.3 km
In one-dimensional motion where the direction is indicated by a plus or minus sign, the average velocity of an object has which of the following properties?
a. It is positive. c. It is zero. b. It is negative. d. It can be positive, negative, or zero.