When contractors laid the concrete slabs on the ground, they will always leave gaps in between the concrete slabs as shown in the picture below.
concrete
slabs
gaps
(c) Explain why do contractors leave gaps in between the concrete slabs.
[1m]

Which two objects have the greatest gravitational force acting between them

Ahowler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 4.6 km. assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 w/m2. what is the acoustic power emitted by the howler

Un jugador de beisbol batea un foul recto en el aire.la pelota deja el bate con una rapidez de 120 km/h. en ausencia de resistencia del aire. ? cual sera la rapidez de la pelota cuando la atrape el catcher