Spherical particles of density 2.0 g/cm3 are shaken in a container of water (viscosity = 1.0 × 10^-3 N•s/m3). The water is 8.0 cm deep and is allowed to stand for 15 minutes. What is the greatest terminal velocity of the particles still in suspension at that time?
a. 0.55 × 10^-5 m/s
c. 4.4 × 10^-5 m/s
b. 1.1 × 10^-5 m/s
d. 8.8 × 10^-5 m/s
D
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A jet has an angular length of 10 seconds of arc and flows from a star at a distance of 2,000 pc. How far does this jet extend away from the star?
a. 20,000 pc b. 20,000 AU c. 20, 000 ly d. 20,000 miles e. 20,000 km
All minerals exhibit cleavage.
a. true b. false
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
A 2.0-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 250 N/m) which has its other end fixed. The block passes through the equilibrium position with a speed of 2.6 m/s and first comes to rest at a displacement of 0.20 m from equilibrium. What is the coefficient of kinetic friction between the block and the horizontal surface?
a. 0.32 b. 0.45 c. 0.58 d. 0.19 e. 0.26