Standing Waves on a String: The speed of propagation of a transverse wave on a 2.0-m long string fixed at both ends is 200 m/s. Which one of the following is not a resonant frequency of this string?
A. 25 Hz
B. 50 Hz
C. 100 Hz
D. 200 Hz
Answer: A
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a. differentiation b. cratering c. glaciation d. accretion e. flooding
Equilibrium: In the figure, a uniform ladder of weight 200 N and length 10 m leans against a perfectly smooth wall. A firefighter of weight 600 N climbs a distance x up the ladder. The coefficient of static friction between the ladder and the floor is 0.50. What is the maximum value of x for which the ladder will not slip?
A. 3.9 m B. 5.0 m C. 6.0 m D. 6.3 m E. 8.4 m
A level pipe contains a nonviscous, incompressible fluid with a density 1200 kg/m3 that is flowing steadily. At one position within the pipe, the pressure is 300 kPa and the speed of the flow is 20.0 m/s
At another position, the pressure is 200 kPa. What is the speed of the flow at this second position? A) 567 m/s B) 16.2 m/s C) 32.9 m/s D) 23.8 m/s E) 186 m/s
How are elements heavier than iron made? Why are they rare?
What will be an ideal response?