To solve this problem we will apply the concepts related to kinetic energy and the value of momentum. Both variables are dependent on the mass and velocity of the object. By dividing between the two terms we can clear the speed of the object and find its value. Let's proceed to define the kinetic energy, for which,
Here,
m = mass
v = Velocity
The expression of momentum of a object is given as
If we divide two expression we have that
Rearrange to find the velocity we have that
Replacing we have that
Therefore the speed of the object is 23.68m/s
Graphs are used to show how fast it goes and how long it takes
Answer:
static friction is developed between 2 surfaces in state of rest so i think answer is c.Even though the wheel is in motion, the patch of the tire in contact with the ground is stationary relative to the ground, so it is static rather than kinetic friction.
Force = 3200 N
Work done = 640, 000 Nm
Explanation:
We begin by calculating the deceleration of the truck, using the velocity and distance;
a = (v² – u²)/2s
whereby;
a = acceleration
v = initial velocity
u = initial velocity
s = distance
We begin by changing the speed from km/h into m/s;
54km/hr = 15m/s
Then acceleration;
a = (0² – 15²) / 2 * 200
a = -225 / 400
a = - 0.5625 m/ s²
To calculate force;
F = ma
Whereby;
F = force
M = mass (in kgs)
a = acceleration
F = 1800 / 0.5625
F = 3200 N
Work done = Force * displacement
Work done = 3200 * 200
= 640, 000 Nm
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Answer:
38%
Explanation:
The following data is obtained from water property tables:
Part a)