The Greenland ice sheet can be one km thick. Estimate the pressure underneath the ice. (The density of ice is 918 kg/m3.)
a. 9.0 × 10^5 Pa (9 atm)
b. 2.5 × 10^6 Pa (25 atm)
c. 4.5 × 10^6 Pa (45 atm)
d. 9.0 × 10^6 Pa (90 atm)
d
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Can the total mechanical energy E = KE + PE ever be negative ?
A. Yes, always. B. Yes, because KE can be negative. C. Yes, because PE can be negative. D. No.
A boy kicks a football with an initial velocity of 20 m/s at an angle of 25° above the horizontal. If we neglect air resistance, the magnitude of the acceleration of the ball while it is in flight is
A) 25 m/s2. B) 18 m/s2. C) 9.8 m/s2. D) 8.5 m/s2. E) 0 m/s2.
How many valence electrons does gallium (Ga, atomic no. = 31) have?
A) 1 B) 6 C) 3 D) 31 E) 70
A fan is turned off, and its angular speed decreases from 10.0 rad/s to 6.3 rad/s in 5.0 s. What is the magnitude of the angular acceleration of the fan?
A) 0.86 rad/s2 B) 0.74 rad/s2 C) 0.37 rad/s2 D) 11.6 rad/s2 E) 1.16 rad/s2