<span>The moving car has some momentum, but
the stationary truck has none.
Momentum of any object is (mass) times (speed).
If the object isn't moving then it has no speed,
and its momentum is zero, no matter how much
mass it may have.</span>
Answer:
im sorry i cant help :(
Explanation: i hope someone does
Since in an electromagnetic wave the electric and magnetic fields are perpendicular to each other and perpendicular to the direction of motion, the electric field has to point in the z direction.
Answer:
3.84 erg
Explanation:
According to Hooke's law, the energy required to stretch a spring by x length is
where k is the spring constant. We can plug in E = 4 and x = 10 to estimate k
To stretch 4cm further (at 14cm), the total work required is
The additional work needed is 7.84 - 4 = 3.84 erg