Two boats start together and race across a 62-km-wide lake and back. boat a goes across at 62 km/h and returns at 62 km/h. boat b goes across at 31 km/h, and its crew, realizing how far behind it is getting, returns at 93 km/h. turnaround times are negligible, and the boat that completes the round trip first wins. (a) which boat wins

boat A

Explanation:

Distance to one point of the race = 62 km

Speed of boat A across the distance = 62 km/h

Speed of boat A to return the same distance = 62 km/h

Time = Distance / Speed

Time taken by boat A to cover the first length

Time taken by boat A to cover the return length

So, total time taken by boat A is 1+1 = 2 hours

Speed of boat B across the distance = 31 km/h

Speed of boat B to return the same distance = 93 km/h

Time = Distance / Speed

Time taken by boat A to cover the first length

Time taken by boat A to cover the return length

So, total time taken by boat B is 2+0.67 = 2.67 hours

Hence boat A wins.

it becomes positively charged by charging it

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.