Secondary wavelets spread from a wave with
A) reduced speed.
B) an unchanging speed.
C) an increased speed.
D) none of the above
Answer: B
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Which of the following types of chemical bond is not a primary bond type?
(a) Covalent (b) Fluctuating- electric dipole (c) Metallic (d) Ionic
If an object absorbs more energy than it emits, its
A) thermal energy decreases. B) temperature decreases. C) both of these D) none of the above
If the cube in this figure were replaced with a cube of less density than water it would _________, and if replaced with a cube of greater density, it would _________
a. rise/sink b. sink/rise c. remain at the same level/remain at the same level d. rise/rise e. sink/sink
A projectile is projected from the origin with a velocity of 30.0 m/s at an angle of 45.0 degrees above the horizontal. What is the velocity and time when the projectile hits the ground?
A. Vx = 21.2 m/s, Vy = -21.2 m/s at t = 4.33 s B. Vx = 16.7 m/s, Vy = -16.7 m/s at t = 3.33 s C. Vx = 21.1 m/s, Vy = -16.7 m/s at t = 2.83 s D. Vx = 16.7 m/s, Vy = -21.2 m/s at t = 4.33 s E. Vx = 21.2 m/s, Vy = -15.0 m/s at t = 3.33 s