Kinetic energy is the energy that is possessed by an object that is moving. It is calculated by one-half the product of the mass and the square of the velocity of the object. We calculate as follows:
KE = mv^2 / 2
KE = 100 kg (20 m/s)^2 / 2
KE = 20000 J
1). From the frame of reference of a passenger on the airplane looking out of his window, the tree appears to be moving, at roughly 300 miles per hour toward the left of the picture.
2). The SI unit best suited to measuring the height of a building is the meter.
3). 'Displacement' is the straight-line distance and direction from the start-point to the end-point, regardless of the path that was followed to get there.
The ball started out in the child's hand, and it ended up 2 meters away from her in the direction of the wall. So the displacement of the ball from the beginning to the end of the story is: 2 meters toward the wall.
Answer:
Explanation:
Conceptual analysis
To solve this problem we apply Newton's second law:
The acceleration of an object is proportional to the force F acting on it and inversely proportional to its mass m.
a = F / m
Where,
F = m * a Formula (1)
F: Force in Newtons (N)
m: mass in kg
a: acceleration in m/(s^2)
a = v / t Formula (2)
v: speed in m/s
t: time in seconds (s)
Known information
We know the following data:
m = 1kg
v = 1 m/s
t = 1s
Development of the problem:
In the Formula (2):
In the Formula (1):
Answer:
<h2>a) -1.93m</h2><h2>b) +0.643</h2>
Explanation:
Image distance and focal length of a convex mirror is negative.
a) Using the mirror formula to determine the image distance;
f = focal length of the mirror = -5.40m
u = object distance from the mirror = 3.00m
v = image distance from the mirror
b) Magnification = image distance/object distance
Magnification = 1.93/3
Magnification = +0.643
<em>Note that we do not use the negative value of the image distance to calculate the magnification of the object</em>