An important news announcement is transmitted by radio waves to people who are 51 km away, sitting next to their radios, and by sound waves to people sitting across the newsroom, 3.6 m from the newscaster. Take the speed of sound in air to be 348 m/s. What is the difference in time that the message is received

In which of the following cases is work being done on an object? question 2 options: pulling a trailer up a hill carrying a box down a corridor suspending a heavy weight with a strong chain pushing against a locked door

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

Where do magnetic lines of force enter earth?