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<span>Hibernation. Hibernation is a state of animal dormancy characterized by inactivity, slow breathing, and a lowered metabolic rate in response to lower temperatures (specifically during winter). During the rainy season finding the right food for many animals can be very challenging-- that's why they often have to enter a phase of inactivity which helps them save energy and survive the winter without eating much. Animals like the Polar bear store energy by eating extra food and storing it as body fat which they then use later on as energy while sleeping or during pregnancy. This period of inactivity is typical with endotherms which regulate heat by its internal bodily functions instead of relying on ambient heat. The animal decreases its metabolic rate, which then decreases body temperature and this may last several days, weeks, or months depending on the species, ambient temperature, time of year, and individual's body condition.</span>
Answer:
the speed of the textbook just before it hits the floor is 2.4 m/s
Explanation:
Given the data in the question;
mass of pulley = 1.50 kg
radius of pulley = 0.240 m
mass of text book = 2.0 kg
height from which text book was released = 0.9 m
angular speed of the pulley = 10.0 rad/s
the speed of the textbook just before it hits the floor = ?
the speed of the textbook v = angular speed of the pulley × radius of pulley
we substitute
v = 10.0 rad/s × 0.240 m
v = 2.4 m/s
Therefore, the speed of the textbook just before it hits the floor is 2.4 m/s
<h2>
Answer:20.97g N,32.63g N</h2>
Explanation:
We consider the forces at the knot.
The vertical forces are
is the vertical component of tension 
at the knot.
is the weight of the mass 
acting downwards.
The horizontal forces are
is the tension in the rope acting left.
is the horizontal component of tension acting towards right.
Since the knot has no mass,it is always in equilibrium.
So,the sum of forces acting on it will be zero.
Balancing vertical forces gives,
=
Balancing horizontal forces gives,
