Answer:
Jims is better
Explanation:
His number is more complex which means it is more accurate
Answer:
d = 100.56 m
Explanation:
It is given that,
Force acting on the dog is 22.4 N
Angle at which the force is applied is 115 º
Work done is - 42.3 J
We need to find the distance covered by the dog. The work done by an object is given by :
d = distance covered by the dog
So, the dog moves a distance of 100.56 m.
Answer:
Ring v² = gh
solid wheel (cylinder) v² = 4/3 gh
Explanation:
Let's use conservation of energy to find the speed of the wheels at the bottom of the hill.
starting point. Point before starting movement
Em₀ = mgh
final point. At the bottom of the hill
Em_f = K = ½ m v² + ½ I w²
energy is conserved
Emo = Em_f
mgh = ½ m v² + ½ I w²
angular and linear velocity are related
v = w r
we substitute
mgh = ½ m v² + ½ I v² / r²
mgh = ½ (m + I / r²) v²
v² =
the moments of inertia are tabulated
Ring
I = mr²
v² = 2 m g h / (m + m)
v² = gh
solid wheel (cylinder)
I = ½ m r²
v² = 2m gh / (m + m / 2)
v² = 4/3 gh
We can see that due to the difference in the moment of inertia of each body it is different, the solid wheel has more speed when it reaches the lower part of the ramp
The efficiency of the engine at the given useful energy and input energy is 28%.
The given parameters:
- <em>Input energy of the engine, = 125 J</em>
- <em>Useful energy of the engine, 35 J</em>
The efficiency of the engine is defined as the ratio of the output energy (useful energy) to the input energy and it is calculated as follows;
Thus, the efficiency of the engine at the given useful energy and input energy is 28%.
Learn more about efficiency of engine here: brainly.com/question/6751595
Answer:
P = I V power produced by source at voltage V thru resistance R
I = V / R current thru resistance R
P = V^2 / R
Power produced will decrease as the output resistance R increases
Check: if R increases to ∞ the power produced will go to zero