Wedell seals make holes in sea ice so they an swim down to forage on the ocean floor below. Measurements for one seal showed that it dived straight down from such an opening reaching a depth of .30 km in a time of 5.0 minutes. What was the speed of the diving seal?
A. .60 M/S
B. 1.0 M/S
C. 1.6 M/S
D. 6.0 M/S
E. 10 M/S
Answer: B. 1.0 M/S
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Spiral and irregular galaxies have active star formation
a. True b. False Indicate whether the statement is true or false
A large ice cube is 30 cm on each side. If the length of each side is increased by a factor of two, the surface area
A. increases by a factor of ½. B. increases by a factor of 2. C. increases by a factor of 4. D. increases by a factor of 8.
When two sound waves are out of phase by ____, destructive interference will occur
a. 20° b. 120° c. 900° d. 720° e. 950°
A 0.40-kg object, attached to a spring with spring constant k = 10 N/m, is moving on a horizontal, frictionless surface in simple harmonic motion of amplitude of 0.080 m. What is its speed at the instant when its displacement is 0.040 m? (Hint: Use conservation of energy.)
a. 17 m/s c. 3.5 cm/s b. 35 cm/s d. 6.9 cm/s