Which of the following must be happening if an object is in uniform circular motion?
O A. The object must be moving in a straight line.
O B. The object's velocity must be changing.
O C. The object's speed must be changing,
O D. The object's centripetal acceleration must be changing,

Which of the following represents an upside-down image?

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers