Answer:
mechanical thermal chemical
Explanation: because you use mechanical energy to turn it on
D. Giant kangaroo rats enrich the soil for plants with their piles of grass clippings in the California grasslands.
Explanation:
Giant kangaroo rats enriching the soil for plants with their piles of grass clippings in the California grasslands is an example of how biodiversity contributes to the sustainability of natural environment.
- Biodiversity refers to the variety of life forms in an area.
- The more diverse an ecosystem is, the more sustainable it is.
- Decaying plant pilings cut by the Kangaroos when they decay release useful nutrients to the soil.
- This would not be possible if an animal like the Kangaroo rats are not present.
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Answer:
14.3kg
Explanation:
Given parameters:
Quantity of heat = 149000J
Change in temperature = 5.23°C
specific heat of the ice = 2000J/kg°C
Unknown:
Mass of the ice in the bag = ?
Solution:
The heat capacity of a substance is given as:
H = m c Ф
H is the heat capacity
m is the mass
c is the specific heat
Ф is the temperature change;
since m is the unknown, we make it the subject of the expression;
m = H/ mФ
m = = 14.3kg
The work done by tension force of 14N applied on the laptop by a rope as it moves 2.0 mm up the slope is 0.028 J
W = F d cos θ
W = Work done
F = Force
d = Displacement
θ = Angle between force and displacement vector
F = 14 N
d = 2 mm = 0.002 m
θ = 0
W = 14 * 0.002 * 1
W = 0.028 J
Work done is the change in energy of an object. So if an object moves a certain distance, work is done on the object. If the force and displacement are perpendicular to each other there is no work done on the object.
Therefore, the work done by tension on the laptop is 0.028 J
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