Answer:
Explanation:
Thermal expansion is where materials expand while being heated, causing them to take up more space. Some materials expand more than others. But this all happens due to the motion of tiny little molecules. Temperature is the average kinetic energy of the molecules in a substance.
Thermal expansion is an important consideration for engineering because different materials exhibit changes in size when exposed to heat. Thus, affecting length, width, surface area, volume, shape etc
Newton's 2nd law of motion . . . . . Force = (mass) x (acceleration)
Divide each side by (mass), and you have
Acceleration = (force) / (mass)
We know the force and mass for this truck, so we can fillum in:
Acceleration = (500 N) / (3,000 kg) = 0.167 m/s² .
t1 = √2h1/g = √2*0.5/9,8 = 0.319 sec
t2 = √2h2/g = √2*1.0/9,8 = 0.451 sec
In which t = times for the vertical movement
h = height
g= gravity (we use standardized measurement of 9.8)
d1 = 1*0.319 = 0.319 m
d2 = 0.5*0.451 = 0.225 m
in which d = Horizontal distance
ratio
= di : d2
= 0.319 : 0.225
= 3.19 : 2.25
Answer:
a. -191.7 J
Explanation:
The work done by a force is given by W = Fdcosθ where F = force applied and d = distance moved and θ is the angle between the force and distance moved.
Here, F = frictional force = 14.2 N
d = distance = 13.5 m
and θ = 180° since the direction of the frictional force and distance are opposite.
So, W = Fdcosθ = 14.2 × 13.5cos180° = -191.7 J
