The product of (frequency) times (wavelength) is always
the same number (the speed of the wave).
So if the frequency is doubled, the wavelength has to drop to
half of what it was, in order to keep their product constant.
Picking up a box, pushing a box along the ground, and pulling a box along the ground (B, C, and D) definitely involve work being done.
If a person CARRIES a box from one place to another, AND keeps it at the same height during the entire carry, then no work is done. ( A )
For a car that is pulled by a cable we can say that there are two forces on it
1. force of gravity downwards
2. tension force due to cable upwards
so here if upward force due to cable is more than the weight of the car then we have net upward force on the car
Due to this force the velocity of car will increase with time because here car is also moving upwards and we know that when net force will act in the direction of velocity of car then the velocity will always increase.
So here we can say that velocity of car will increase in this case
Answer:
C
Explanation:
because is something else you need from medicine
I don't understand your question..
