Problem 2: A stationary motion detector sends sound waves of frequency 1.5 ×105 Hz toward a truck approaching at a speed of 45 m/sec. What is the frequency of the waves reflected back to the detector? 1.95 ×105 Hz

An object is located 30.0 cm from a concave mirror. the focal length is 15.0 c,. what is the image distance? a. 30.0 cm b. -10 cm c. 10.0 cm d. -30.0 cm

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.