Answer:
Explanation:
Given
mass of sled =26 kg
coefficient of static friction
coefficient of kinetic friction
In order to move sled from rest we need to provide a force greater than static friction which is given by
After Moving Sled kinetic friction comes in to play which is less than static friction
therefore minimum force to keep moving sledge at constant velocity is 18.34 N
<u>Answer</u>:
<em>Dog drinking water after it feels thirsty is an example of an organism responding to its internal environment to maintain homeostasis.
</em>
<u>Explanation</u>:
The regulation of temperature of the body of an organism is called homeostasis. <em>Warm blooded organisms depend on their internal environment to maintain homeostasis while cold blooded organisms</em> completely depend on their external environment to maintain homeostasis.
The <em>body temperatures of warm blooded organisms maintain its constancy despite changing temperature of the external environment</em>. But the case of cold blooded organisms is different.
Their body temperature completely depends on the external environment and thus they have<em> several behavioral and physiological adaptations to maintain their body temperatures </em>at the comfortable level.
<em>In this example dog is a warm blooded animal and it drinks water to maintain homeostasis since water helps in thermal regulation of its body.
</em>
Answer:
Yes it is possible to charge balloon to several thousand of volts and the balloon will also store several Joules of energy.
Explanation:
By rubbing a balloon on one's hair or on different types of clothing, the balloon either gain or loss electron.
If the balloon gains electron it becomes negatively charged, it contains more electron and subsequently charged to several thousand volts.
Also, if the balloon losses electron, it becomes positively charged. In this case it contains more proton, which makes the balloon positively charged to several thousand volts.
However, amount of joules depends on volts produced in the balloon.
Volt = Joules/coulomb,
Joules = volts*coulomb
Because the charge of the particles (electron and proton) are small, amount of joules will always be small than volts.
So, it is possible to charge balloon to several thousand of volts and the balloon will store several Joules of energy
Answer:
20kph
Explanation:
Since she travels 100kpm in 5 hours and 100 divided by 5 is 20 she would travel 20km in one hour
Answer
12.3 years
Step by step Solution
Step 1
The first step is to use the radioactive decay formula to to calculate the radioactive constant for hydrogen 3. The radioactive formula is , where is the amount available at any time, is the initial amount of substance, is the radioactive decay constant. We are given the values . We use these values to calculate the constant as follows,
Step 2
The next step is to use the value for the decay constant to calculate the half life. We notice that at the half life, the value of the material remaining is 0.5. We show the calculation as shown below,
The half life is 12.3 years.