Answer:
the force exerted by the triceps muscle is 1190.4 N or 1.2 kN
Explanation:
given data
F = 96 N
D = 2.50 cm
L = 31 cm
solution
we will apply here equilibrium condition that is
∑r = about the elbow joint ............................1
so force exert by the muscle is
F(tri) × D = F × L .................2
put here value
F(tri) × 2.50 = 96 × 31
solve it we get
F(tri) = 1190.4 N
so the force exerted by the triceps muscle is 1190.4 N or 1.2 kN
Answer:
The tension in the rod as the ball moves through the bottom circle is 9.8 N
Explanation:
When the ball is released from rest, the centripetal force equals the weight of the ball. So mv²/r = mg where m = mass of ball = 0.5 kg, v = speed of ball, r = radius of vertical circle = length of rod = 0.5 m and g = acceleration due to gravity = 9.8 m/s²
v = √gr = √9.8 m/s² × 0.5 m = √4.9 = 2.21 m/s
Now at the bottom of the circle T - mg = mv²/r where T = tension in the rod
T = m(g + v²/r)
= m(g + (√gr)²/r)
= m(g+ gr/r)
= m(g + g)
= 2mg
= 2 × 0.5 kg × 9.8 m/s²
= 9.8 N
So, the tension in the rod as the ball moves through the bottom circle is 9.8 N
In all energy transfers, if no energy leaves or enters the system, then the potential energy will always be less.
Answer:
(i) by carrying an extra load may increase your weight.
(ii) the height of the stairs also which is the distance you climb through.
Explanation:
Since,
Power= work done/time
work done = force * distance.
*weight is a force.
*the height of the stairs is the distance.
the time depends inversely on the power which means that when the time spent is high the power is reduced. And in this case, we're trying to increase the power.