Acertain part of aircraft engine has a volume of
1.3ft3.
(a) find the weight of the piece when it is made ofiron.
(b) if the same piece is made of aluminum, find the weight
anddetermine how much weight is saved by using aluminum instead
ofiron.

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

Explain why electric current cannot exist if a current doesn't have a voltage source.