A child pushes her toy across a level floor at a steady velocity of 0.50 m/s using an applied force of 2.0 N. If the weight of t
2 answers:
Answer:
a. 0.25
Explanation:
The toy is moving across the floor at constant velocity - this means that its acceleration is zero.
According to Newton's second law, this means that the net force acting on the toy is zero:
(1)
because a=0.
The net force, in this case, consists of two forces acting in opposite directions:
- The applied force, F = 2.0 N
- The frictional force,
where is the coefficient of sliding friction and (mg)=8.0 N is the weight of the toy.
Therefore, the equation of the forces (1) becomes:
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<h2>Hello!</h2>
The answer is: B. Kinetic energy
<h2>Why?</h2>Since the ball is falling, speed increases because the gravity acceleration is acting. When speed increases, the kinetic energy increases too, so the ball is gaining kinetic energy.
The gravity acceleration is equal to , it means that when falling, the ball will increase it's speed 9.81m every second.
We can calculate the kinetic energy by using the following formula:
Where:
Have a nice day!
<h2 />Explanation:
We have,
Speed of plane a is 900 km/h
Plane b is moving at a rate of
It is required to find which plane is faster. To find which plane is faster, we need to compare their speeds.
Speed of a plane a is 900 km/h and that of plane b is 50 km/h. So, we can say that plane a is moving faster.