Room that wont bother other people... instruments a stereo, and a sound system
Answer:
Almost all machines require energy to offset the effects of gravity, friction, and air/wind resistance. Thus, no machine can continually operate at 100 percent efficiency.
Answer:
Explanation:
Considering an object that moving about in a circular path, the equation for such centripetal force can be computed as:
The model for the person can be seen in the diagram attached below.
So, along the horizontal axis, the net force that is exerted on the person is:
Dividing both sides by "m"; we have :
Making "v" the subject of the formula: we have:
So, when 
= 0; the velocity is maximum
∴
Hence; the maximum walking speed for the person is
Answer:
Force of friction is (-30 N).
Explanation:
The force applied on the box across the floor is 30 N.
The force of gravity is (-8 N) and the the normal force is 8 N.
It is based on Newton's third law of motion. Newton's third law of motion states that the force acting on object 1 to object 2 is equal in magnitude of the force from object 2 to 1 but in opposite direction.
Here there is force of 30 N is applied in horizontal direction. The frictional force act in opposite direction. So, the force of friction is -30 N so that box across the floor.
