W boson has +1e or - 1e charge, Z boson has 0 charge.
Leptons have +1e, -1e or 0 charge.
Photons have 0 charge.
Only quarks have a charge of +2/3e or -1/3e of an electron charge.
To be exact, only up-type quarks (Up, Down and Top quarks) have a +2/3e or two thirds of an electron charge.
So the correct answer is D) Quark.
Answer:
Kinetic energy of the projectile at the vertex of the trajectory: 
.
Work done when firing this projectile: 
.
Explanation:
Since the drag on this projectile is negligible, the horizontal velocity 
of this projectile would stay the same (at 
) throughout the flight.
The vertical velocity 
of this projectile would be 
at the vertex (highest point) of its trajectory. (Otherwise, if 
, this projectile would continue moving up and reach an even higher point. If 
, the projectile would be moving downwards, meaning that its previous location was higher than the current one.)
Overall, the velocity of this projectile would be 
when it is at the top of the trajectory. The kinetic energy 
of this projectile (mass 
) at the vertex of its trajectory would be:
.
Apply the Pythagorean Theorem to find the initial speed of this projectile:
.
Hence, the initial kinetic energy of this projectile would be:
.
All that energy was from the work done in launching this projectile. Hence, the (useful) work done in launching this projectile would be .
Liar, not even 40 points....
To make sure I don’t has 35 012345 bishops
Answer:
Gravity is a constant quantity
Explanation:
