Newton's first law of motion says something like "An object remains
in constant, uniform motion until acted on by an external force".
Constant uniform motion means no change in speed or direction.
If an object changes from rest to motion, that's definitely a change
of speed. So it doesn't remain in the state of constant uniform
motion (none) that it had when it was at rest, and that tells us
that an external force must have acted on it.
Answer:
The number of turns is 64.
Explanation:
Given that,
Magnetic field = 0.050 T
Area of coil = 100 cm²
Frequency = 60 Hz
Output voltage emf= 12 V
We need to calculate the number of turns
Using formula of induced emf
Hence, The number of turns is 64.
Answer: Geologists map out <em>data </em>from previous earth quakes to determine earthquakes risk.
Explanation:
Geology is the study of earth. Also, it is the study of how Earth's materials, structures etc are changed over time.
Geologist is a scientist who studies the structure of earth, rocks, soil, fossils and earthquake. So, they map out the data from previous earthquakes to determine earthquake risk.
Answer: 708 N
Explanation:
Given
At rest, Elevator reads 588 N
When it starts moving upward at 
, apparent weight changes
i.e. weight can be given by
The apparent weight is 708 N
3.13 m/s2
.
the formula for acceleration is as follows:
force/mass = acceleration
-
so 25/8 = 3.13
