If a lens is submerged in water, what happens to its focal length?
A) It decreases.
B) It stays the same.
C) It becomes negative.
D) It increases.
D
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Constant Acceleration Kinematics: A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?
A. 15 s B. 30 s C. 45 s D. 4.2 s
A flatbed truck is carrying a 20.0-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.400
What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place? A) 0.381° B) 13.1° C) 21.8° D) 23.6° E) 66.4°
The theory of seafloor spreading was proposed in 1960 by
a. Alfred Wegener. b. Harry Hess. c. Albert Einstein. d. Andrija Mohorovicic.