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A rock is thrown horizontally off a cliff that is H= 23 m high. The rock strikes the ground at an angle of 46 degrees. With what initial speed (in m/s) was the rock thrown? Assume that the air resistance is negligible.

A transverse wave has the displacement y(x, t) = (3.5 mm) sin[(2.0 m−1)x−wt] . If its speed is 15 m/s, what is the period of the wave (in seconds)?

The specific structure that is GREEN and marked with arrows is:  

You are playing a musical instrument with two strings. String A is 50 cm long and string B is 70 cm long. Both strings are under the same amount of tension. You find that the frequency of the third harmonic on string A is the same as the frequency of the second harmonic on string B. What is the ratio of the linear mass density of string A, to that of string B (i.e., what is μA/μB)?

You are playing a musical instrument with two strings. The linear mass density of string A is 2.1 g/cm and that of string B is 3.4 g/cm. Both strings are under the same amount of tension. You find that the frequency of the second harmonic on string A is the same as the frequency of the third harmonic on string B. What is the ratio of the length of string B, to that of string A (i.e., what is LB/LA)?

Consider the resonant oscillation shown in the image below, where a string of length 0.8 m and mass of 4.5 gr, has been stretched with an unknown tension. If the frequency of the transverse waves in the string is 440 Hz, what is the tension of the string in N?

A horizontal mass-spring system is in simple harmonic motion, and the position of the mass can be modeled as x(t) =[0.3m] sin([2s-1]t+π/4), where x is in meters and t is in seconds. At t= 4 s, what is the ratio of the kinetic energy of the mass to its potential energy, K/U?

A solid disk of diameter 16 cm and mass 10 kg is connected to a pivot at the edge of the disk. When the mass is displaced slightly from the equilibrium position and released, what is the angular frequency of the resulting oscillating motion (in rad/s)?

Which of the following diseases is more likely to occur through contact with contaminated water in industrialized countries than in non-industrialized countries?

Individuals who are allergic to penicillin generate ___ antibody against the antibiotic.