This question is asking the force on the rope. We can find this by using centripetal acceleration, then multiply by the ice skater's mass.
First we need to find the centripetal acceleration, which is a = v^2/r
We are given v and r, so we solve for a.
a = [(5.14m/s)^2]/(0.525m) = 50.323 m/s^2
Next multiply by the ice skater's mass (because F=ma) which is 44.6 kg
We then get F = (50.323m/s^2)(44.6kg) = 2244.407924N
Divide by 10^3 to get kN, we get:
2.244kN
Hope this helps!
Answer:
22425 J
Explanation:
From the question,
Applying
Q = cm(t₂-t₁).................. Equation 1
Where Q = Thermal Energy, c = specific heat capacity of aluminium, m = mass of aluminium, t₂ = Final Temperature, t₁ = Initial Temperature.
Given: c = 897 J/kg.K, m = 1.0 kg, t₁ = 50 °C, t₂ = 25 °C (The final temperature is reduced by half)
Substitute these values into equation 1
Q = 897×1×(25-50)
Q = 897×(-25)
Q = -22425 J
Hence the thermal energy lost by the aluminium is 22425 J
The air resistance and gravity pulling it down
The question is incomplete as it does not have the options which are:
- They need more oxygen to function, so gas exchange needs to decrease.
- They need more oxygen to function, so gas exchange needs to increase.
- They need more carbon dioxide to function, so gas exchange needs to increase.
- They need more carbon dioxide to function, so gas exchange needs to decrease.
Answer:
They need more oxygen to function, so gas exchange needs to increase. Explanation:
In the given question, Kristen is doing physical exercise for a long time as she is running in half marathon.
As a result of continuous running her breathing rate has increased because the physical exercise requires energy in the form of ATP.
The formation of ATP in the body is the result of the cellular respiration which takes place in the mitochondria which require oxygen and oxygen in the body is inhaled only through the breathing. So, more production of the ATP requires more oxygen and therefore more breathing.
Thus, the selected option is correct.
Answer: a) 1.846m
b) 0.923m
Explanation: given that height h = 1.9m
Assume his eyes are 5.4 cm below the top of his head
5.4 cm = 5.4 / 100 = 0.054 m
1.9 – 0.054 = 1.846 meter
The top of the mirror should be placed at 1.846m
That is the vertical distance from his eyes to top of his head.
Light must travel from the top of his head to the mirror in order for him to see the head. Then travel from this position to his eyes. To do this, the mirror must be placed at a position that is halfway between his eyes and the top of his head.
The minimal vertical distance from the level of the person’s eyes to the top of the mirror will be:
d = ½ ×1.846 = 0.923 meters
