Answer:
13 N
Explanation:
The Net Force of an object should be the difference between the forces applied to the object if the object is not in equilibrium. This object is not in equilibrium so therefore by finding the difference between the forces, you will find your answer. 20 N - 7 N = 13 N.
FOUR USES OF CONCAVE MIRROR:Satellite dishes,headlights of a car, telescopes used for astronomical studies, and shaving mirrors because of there curved and reflective surface.
FIVE USES OF LENSES: Camera lens ,microscopes ,magnifying glass,eyeglasses,projector
Momentum = mass x acceleration
5 x 2 = 10 kg. m/s
Answer:
distance changing at rate of 3.94 inches/sec
Explanation:
Given data
wall decreasing at a rate = 9 inches per second
ladder L = 152 inches
distance h = 61 inches
to find out
how fast is the distance changing
solution
we know that
h² + b² = L² ..................1
h² + b² = 152²
Apply here derivative w.r.t. time
2h dh/dt + 2b db/dt = 0
h dh/dt + b db/dt = 0
db/dt = - h/b × dh/dt .............2
and
we know
h = 61
so h² + b² = L²
61² + b² = 152²
b² = 19383
so b = 139.223
and we know dh/dt = -9 inch/sec
so from equation 2
db/dt = -61/139.223 (-9)
so
db/dt = 3.94 inches/sec
distance changing at rate of 3.94 inches/sec
Answer:
Homeostasis is the body or cells ability to seek and maintain equilibrium or stability in response to external changes.
Explanation:
Homeostasis is a process through which a cell or entire body of an organism tends to attain it's original state by countering any external environmental change to which it is exposed. In simple words we can define homeostasis as a regulatory mechanism which helps a cell/organism to maintain constant internal environment.
For example during summer season when external environment gets extremely hot and temperature rises up to 45-48 °C in such condition our body's internal temperature which is normally 37 °C gets affected and tends to rise so as to attain equilibrium with the external environment. But if the internal temperature will rise more than optimum temperature i.e. 37 °C then our body's machinery will cease to work and it will die out if temperature will keep on rising. In such scenario to avoid temperature rise our body will use homeostasis mechanism to counter the change. In order to do so we have sweat glands. Our sweat glands will start secreting sweat as a result of which the external heat rather than raising our body's temperature will be used to evaporate water present in the sweat and we will be able to protect our body from harmful external environment.
= mgh2