A stone is thrown vertically upward. At the top of its vertical path its acceleration is
A) zero.
B) 10 m/s2.
C) somewhat less than 10 m/s2.
D) undetermined.
Answer: B
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Which of the following fundamental forces is hardest for theorists to incorporate into an overall unified theory of nature?
A. Strong interaction B. Electromagnetic interaction C. Weak interaction D. Gravitational interaction
A disk (radius = 8.0 cm) that rotates about a fixed axis starts from rest and accelerates at a constant rate to an angular velocity of 4.0 rad/s in 2.0 s. What is the magnitude of the total linear acceleration of a point on the rim of the disk at the instant when the angular velocity of the disk is 1.5 rad/s?
a. 24 cm/s2 b. 16 cm/s2 c. 18 cm/s2 d. 34 cm/s2 e. 44 cm/s2
When 50 g of a certain material at 100°C is mixed with 100 g of water at 0°C, the final temperature is 40°C. What is the specific heat of the material? The specific heat of water is 1.00 kcal/kg ? C°
A) 0.33 kcal/kg ? C° B) 0.75 kcal/kg ? C° C) 1.3 kcal/kg ? C° D) 7.5 kcal/kg ? C°
Two atoms of hydrogen bond with an atom of oxygen to form a water molecule. This bonding is
a. covalent only. b. polar only. c. both covalent and polar. d. none of these.