Which of the following are fire prevention guidelines? a. check the fire risk level of the area. b. learn and follow the local rules about open fires, camp stoves, kerosene lanterns, and other sources of fire. c. only use camp stoves. d. clear any brush and other flammable debris from around the fire in a five-foot radius. e. only use lighters to start fires.

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward