Question

hi pls I need ASAP. 1 the tubes responsible for the moment of blood from the heart to d other parts of the body is called 2. the body of mass 12kg runs up a set of steps of heights of 15m in 3s calculate the power expanded. 3. a machine with mechanical advantage of 6 is opererated with a force of 7.5n what is the maximum load of machine can carry ​

Answer 1

Answer:

$\large \boxed{\text{1. Veins; 2. 600 W; 3. 45 N}}$

Explanation:

1. Arteries are the tubes responsible for  the movement of blood from the heart to other parts of the body.

2. Power

(a) Work performed

w = mgh = 12 kg × 9.807 m·s⁻² × 15 m = 1800 J

(b) Power level

P = w/t = 1800 J/3 s = 600 W

3. Machine load

The formula for mechanical advantage (MA) is

$MA = \dfrac{F_{o}}{ F_{e}}$

where

Fₒ = the force of the object

Fₑ = the force exerted to overcome that of the object

$\begin{array}{rcl}MA & = &\dfrac{F_{o}}{ F_{e}}\\\\6 & = &\dfrac{F_{o}}{ \text{7.5 N}}\\\\F_{o} & = & \text{45 N}\\\end{array}\\\text{The machine can carry a maximum load of \large \boxed{\textbf{45 N}} }$