A lightbulb has a power of 100 W and is used for 4 hours. A microwave has a power of 1200 W and is used for 5 minutes. How much
1 answer:
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1) 26.6 m
Along the horizontal direction, the lunch pail is moving with a uniform motion (constant speed), since there are no forces acting in this direction.
Therefore, the distance travelled horizontally after a time t is given by:
where we know
is the horizontal velocity
d = 3.50 m is the distance covered horizontally
Solving for t, we find the total time of the motion:
Now we know that the pail takes 2.33 s to fall to the ground. We can now consider the vertical motion of the pail, which is a free fall motion, so the vertical displacement is given by the equation
where, taking downward as positive direction:
u = 0 is the initial vertical velocity
is the acceleration of gravity
Substutting t = 2.33 s, we find how fat the pail has fallen:
2) 10.7 m
In this case, we know instead the vertical displacement:
Therefore, we can use the same equation again
To find the total time of motion:
We know that along the horizontal direction, the velocity is constant:
So, the horizontal distance covered in this time is