Answer:
57 N
Explanation:
Draw a free body diagram. There are three forces:
Weight force mg pulling down.
Normal force N pushing up.
Friction force F pushing horizontally.
Sum of the forces in the y direction:
∑F = ma
N − mg = 0
N = mg
Friction force is the product of normal force and coefficient of friction:
F = Nμ
F = mgμ
F = (65 kg) (9.8 m/s²) (0.09)
F = 57.3 N
Rounded, the friction force is 57 N.
Answer:
Tectonic Plate Movement
Explanation:
Each continent and ocean sits on its own tectonic plate which floats on the Earths upper mantle. They move very little over time.
Answer:
The position of the image = 7.2 cm.
Explanation:
Given:
A Converging lens:
Object distance = 12 cm = -12 cm (sign convention)
Focal length = 18 cm
We have to find the position of the image.
Let the position of the image be .
Sign convention:
The focal length of converging (convex) lens is always positive,while object distance is negative.
Using lens formula:
⇒
⇒
⇒
⇒
⇒
⇒
⇒
⇒
⇒ cm
So the position of the image = 7.2 cm.
D. Most rocks are a mixture of minerals. They can vary on the types of minerals, like crystals.