1). Yes. An object can be moving if the net force acting on the object is zero.
A non-zero net force is required to CHANGE the object's motion ... speed it up,
slow it down, or change its direction. But no force is required to keep it moving
at a constant speed in a straight line.
2).a). The motion of the box changes, from not moving to moving.
So the forces acting on it must be unbalanced.
2).b). The motion of the box doesn't change. It goes from not moving
to still not moving. So the forces acting on it must be balanced.
2).c). The motion of the box changes. Its speed decreases.
So the forces acting on it must be unbalanced.
We will use the formula:
Q = ml
where Q is the heat, m is the mass of substance, and l is the latent heat of vaporization of the substance.
Q = 0.2 x 2.26 x 10³
Q = 452 kJ
Answer:
Explanation:
magnitude: 180-50=130N
Direction: in the direction same as the second horizontal force
Answer:
The work done by the child to reach the cat is, W = 3684.8 J
Explanation:
Given data,
The mass of the child, m = 40 kg
The height of the cat from the ground, h = 9.4 m
The force acting on the child due to gravitational force is,
F = mg
The minimum force required by the child to climb the tree against the gravitational force is,
F = mg
Hence, the work done by the child is,
W = F · h
= 40 x 9.8 x 9.4
= 3684.8 joules
Hence, the work done by the child to reach the cat is, W = 3684.8 J
Answer:
It won't stop
Explanation:
If it is a frictionless surface ....the block will not stop until another force acts on it
