In the given problem, explain why the types of technology valued varies
from location to location.
There are a lot of factors that could determine the evolvement of
technology from a certain place or location:
1. Resources. One is resources and its
availability is one crucial factor.
2. Accessibility. Other areas are
fairly secluded from industrialization and urbanization.
3. People and culture. Humans are the
resources that determines the flow of technology if they want it or not in
their area.
Answer:
1000 N
Explanation:
An impulse results in a change of momentum
FΔt = mΔv
F = 0.001 kg(1000 - 0) m/s / 0.001 s = 1000 N
Answer:
Explanation:
As it mostly occurs on a surface where an ecosystem has previously existed. Primary succession only occurs on a surface where no ecosystem existed ever before!
Answer:
20.26 Nm
Explanation:
r = 1.23 m , m = 93.6 kg, w = 0, f0 = 369 rpm = 369 / 60 = 6.15 rps
w0 = 2 x 3.14 x 6.15 = 38.622 rad/s
t = 2.25 min = 2.25 x 60 = 135 second
Moment of inertia = 1/2 m r^2 = 0.5 x 93.6 x 1.23 x 1.23 = 70.8 kg m^2
use first equation of motion for rotational motion
w = w0 + α t
0 = 38.622 - α x 135
α = 0.286 rad/s^2
torque = moment of inertia x angular acceleration
Torque = 70.8 x 0.286 = 20.26 Nm
When the concrete structure avails it maximum strength, it is safer to place construction load on it. Usually, the concrete gain it maximum strength after 28 days. Concrete when cast take initial settlement on 7 days. Curing is done continuously through the period so that there is no crack occur due to heat transfer. There are various method of concrete curing. On a horizontal surface/ roof/ floor, curing is done through ponding or spreading wet sheets. Testiment/ sample of the concrete are cured by immersion in water tank. After 28 days of curing, concrete gains it maximum strength and can be used for test or usage. Construction load limit is considered in designing/ proportioning the specimen. So the applied load is equal or less than the limit for which it is actually designed.