Q. A 1.6-rm MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as the heart beats. The reflected sound is after that mixed with the transmitted sound, and 80 beats per second are detected. The speed of sound in body tissue is 1500m/s.
Q. Tarzan swings on a 27.00 m long vine initially inclined at an angle of 39.0? with the vertical. The acceleration of gravity if 9.81 m/s2. What is his speed at the bottom of swing if he pushes off with a speed of 3.0 m/s? Respond in units of m/s.