Which of the following explains why international travelers need to use special adapters when plugging a device designed to operate in the u. s. into a wall outlet in europe (i. e., vrms in the u. s. is 120 v, while vrms in europe is 240 v)?
a. the increased voltage causes the device's resistance to increase, and the device won't work.
b. the increased voltage causes the device's resistance to decrease, and the device will overheat.
c. the increased voltage causes an increase in power usage, and the device will overheat.
d. the increased voltage causes a decrease in power usage, and the device won't work.

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

I'm kinda lost ! 1. when marilyn takes her pet dog for a walk, the dog walks at a veryconsistent pace of 0.55 m/s. draw a position-time graph to representmarilyn's dog walking the 19.8 m distance from the front of her house tothe nearest fire hydrant.2. both car a and car bleave school when a stopwatch reads zero. car atravels at a constant 75 km/h, and car b travels at a constant 85 km/h.a) draw a position-time graph showing the motion of both cars. howfar are the two cars from school when the stopwatch reads 2 hrs? calculate the distances and show them on your graph.b) both cars passed a gas station 120 km from the school. when dideach car pass the gas station? calculate the times and show themon your graph.3. the figure below shows the position-time graph showing a shopper'smovement up and down the aisle at a store.a) write a story describing the shopper's movements at the store.b) when does the shopper have a position of 6 m? c) how much time passes between when the shopper enters the aisleand when he gets to a position of 12 m? what is the shopper's averagevelocity between 37 s and 46 s?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?