A jet plane manages to go forward by sucking in
through the
and shooting it out again at the back. (Note: one word for each field)

QUESTION 3

In terms of the action-reaction law, what is the reason why firemen have difficulty holding on to the nozzle of a fire
hose when water is gushing out at high speeds?
The hose's material contracts (action) resulting in a recoil (reaction)
It is an electrically regulated jolt (action) as a build-in feature for safety purposes, so that firemen recoil back
(reaction) from potential flares
The force by which the water is shot out (action) results in an equal counter-force by the water (reaction)
The water hitting on a heavy object or surface (action) results in a counterforce from the object or surface
conducted through the water to the firemen (reaction)
The push-back is only a perceptional effect from the stress which the firemen experience
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Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon

An isolated conducting spherical shell carries a positive charge. part a which statement (or statements) about the electric field and the electric potential inside and outside the spherical shell is correct? which statement (or statements) about the electric field and the electric potential inside and outside the spherical shell is correct? electric potential inside the shell is constant and outside the shell is changing as 1/r2 both the electric potential and the electric field does change with r inside and outside the spherical shell electric potential inside and outside the shell is constant, but not zero electric potential inside the shell is constant and outside the shell is equal to zero electric field inside and outside the shell is constant (does not change with the position r), but is not equal to zero electric field inside and outside the shell is changing as 1/r (where r is the distance from the center of the sphere) electric field inside is equal to zero and outside the shell is constant, but not zero electric potential inside the shell is constant and outside the shell is changing as 1/r electric field inside and outside the shell is changing as 1/r2 electric field inside is equal to zero and outside the shell is changing as 1/r2 electric field inside and outside the shell is zero electric field inside is constant and outside the shell is changing as 1/r

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?