Energy and the unit of measurement is in joules
When an object moves its length contracts in the direction of motion. The faster it moves the shorter it gets in the direction of motion.
The object in this question moves and then stops moving. So it's length first contracts and then expands to its original length when the motion stops.
The speed doesn't have to be anywhere near the speed of light. When the object moves its length contracts no matter how fast or slow it's moving.
Answer:
The largest voltage is 0.02 V.
(d) is correct option.
Explanation:
Given that,
Range = 20 dB
Smallest voltage = 200 mV
We need to calculate the largest voltage
Using formula of voltage gain









Hence, The largest voltage is 0.02 V.
Answer:
<em>We need to (at least) apply a force of 9.8 N to move the block</em>
Explanation:
<u>Second Newton's Law</u>
If a net force
different from zero is applied to an object of mass m, then it will move at an acceleration a, given by

If we apply a force F to an object placed on a rough surface, the only way to make it move is to beat the friction force which is given by

Where
is the static friction coefficient and
is the normal force exerted by the table to the object. Since there is no motion in the vertical direction the normal force equals the weight of the object:

The friction force is

Thus, we need to (at least) apply a force of 9.8 N to move the block