The six forms of energy are chemical, thermal, nuclear, electrical, mechanical, and light energy. Each has different characteristics and uses, such as chemical energy being stored in potential changes or light energy being visible to the human eye.
Energy exists in many forms. Here are six common forms of energy:
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equal in magnitude and equal in direction
B.
equal in magnitude and opposite in direction
C.
opposite in magnitude and equal in direction
D.
opposite in magnitude and opposite in direction
the answer of the question is A
of that energy is used to actually move the car? Record your answer in
kilojoules.
the minimum amount of horizontal force that the man will need to apply so
that the tree will start moving?
A. 240 N
B. 360 N
C. 480 N
D. 120 N
Answer:
120 N
Explanation: First we shoud consider the forces acted on a tree
Friction foce - acting opposite to the moving direction
Weight - Directly acting downwards
Reaction - Directly acting on upwards
For minimum required force should be equal to the friction force
F = μ R
F = 0.5×480
= 120N