What is the magnitude of the force of gravity acting on a box that has a mass of 100 kilograms and is at sea level
2 answers:
Answer:
Force of gravity, F = 980 N
Explanation:
Given that,
The mass of the box, m = 100 kilograms
We need to find the magnitude of the force of gravity acting on a box. It can be calculated using Newton's second law of motion which states the force is given by :
F = ma
a = acceleration
Here,
F = mg
g = acceleration due to gravity
F = 980 N
Hence, the force acting on the object is 980 N.
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where
V is the potential difference across the electrical device
I is the current through the device
R is its resistance
For the heater coil in the problem, we know
and 
, therefore we can rearrange Ohm's law to find the current through the device:
(B) The resistance of a conductive wire depends on three factors. In fact, it is given by:
where
is the resistivity of the material of the wire
L is the length of the wire
A is the cross-sectional area of the wire
Basically, we see that the longer the wire, the larger its resistance; and the larger the section of the wire, the smaller its resistance.
where
V is the potential difference across the electrical device
I is the current through the device
R is its resistance
For the heater coil in the problem, we know
(B) The resistance of a conductive wire depends on three factors. In fact, it is given by:
where
L is the length of the wire
A is the cross-sectional area of the wire
Basically, we see that the longer the wire, the larger its resistance; and the larger the section of the wire, the smaller its resistance.