A baseball would hit the bat harder. This is because the baseball is a lot heavier and more dense than the plastic ball. The keyword that you're looking for is density. The baseball is dense.
<span>The acceleration of an object is equal to the change in velocity over time. Or alternatively, the acceleration of an object is equal to the initial velocity minus the final velocity over the time taken to change from the initial velocity to the final velocity.</span>
Answer:
When the electric field due to one is a maximum, the electric field due to the other is also a maximum, and this relation is maintained as time passes.
Explanation:
Phase of a wave or light ray is the instantaneous situation of the cycle in which the wave is at a given time.
When two waves are in phase means that the maximum and minimum of both coincide in time. They are in the same point of their cycle at the same time. And this relationship is maintained as time passes.
The waves can also be visualized as the oscillation of an electric field. (usually plotted like a sine function).
So the fact that two waves are in phase means that the maximums of their electric field coincide in time.
The correct answer is
b. low frequencies and low energy.
In fact, microwaves and radio waves have frequency up to 
, which are really low compared, for instance, to the frequency of gamma rays (
). Moreover, the energy of an electromagnetic wave is directly proportional to its frequency:
where h is the Planck constant and f the frequency; therefore, low frequency means also low energy.
Answer:
Explanation:
A )
As the two bicycles come closer , the time period of oscillation of bee to oscillate between the two is gradually reduced . It is akin to a pendulum with gradually decreasing amplitude . It will be infinite number of trips the bee will travel before it gets squished .
B )
The bee will survive until the two bicyclists meet each other .
time of their meeting = distance between them / their relative velocity
= 20 / ( 10 + 10 )
= 1 hour .
C )
Total distance travelled by bee during 1 hour
= time x speed of bee
= 1 x 30 km/h
= 30 km .
