Plants have cell walls, but animals do not because otherwise we wouldn't be able to move.
Answer:
a)2.59 ×10⁵ N/C
Direction is to the right.
b) 4.14 × 10⁻¹⁴ N , direction is to the Left.
Explanation:
Given:
Charge =
Charge =
Distance from the negative charge = 0.05 m
Distance to = 0.032 m
a) Electric field = E =
k = Coulomb's constant = 9 × 10⁹ N m²/C²
E = = (1.40625 × 10⁴ + 24.48 × 10⁴ ]
= 2.59 ×10⁵ N/C
Direction is to the right.
b) Force on the electron = Charge on the electron × Electric field E.
⇒ F = ( 1.6 × 10⁻19)(2.59 ×10⁵) = 4.14 × 10⁻¹⁴ N , direction is to the Left.
The average speed is 615.7 mph (275.2 m/s)
Explanation:
The average speed of an object gives a measure of how fast an object is moving over a certain time interval. It is a scalar quantity, and it is calculated as follows
where
v is the average speed
d is the distance covered
t is the time interval
For the jet in this problem, we have:
d = 1293 mi is the distance covered
t = 2.1 h is the time interval
Therefore, the average speed is:
We can also convert into SI units (m/s), keeping in mind that:
And so
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Answer:
The focal length of the lens is 2.5 cm
Explanation:
Use the two equations for thin lenses combined: the one for magnification (m), and the one that relates distances of object , of image , and focal length;
Since we know the value of the magnification (m), we can write the image distance in terms of the object distance, and then use it to replace the image distance in the second equation:
then, solving for the focal distance knowing that the object distance is 1.5 cm: