choose all of the statement below that are co...
choose all of the statement below that are correct concerning mechanical advantage. a you apply a force of 50 n to a shovel. the shovel applies a force of 500 n to the weed. the mechanical advantage is 10. b you apply a force 10 n to a lever which forces a television to lift with a force of 20 n. the mechanical advantage is 200. c it is possible to use a simple machine and gain no mechanical advantage d no simple machine can ever supply a mechanical advantage. e if you wanted to lift a 50kg object up 5meters, you would have to supply a mechanical advantage of 10.
Answer
# Explanation:
## Step1: Recall mechanical - advantage formula
The formula for mechanical advantage (MA) is $MA=\frac{F_{out}}{F_{in}}$, where $F_{out}$ is the output force and $F_{in}$ is the input force.
## Step2: Analyze option A
Given $F_{in} = 50N$ and $F_{out}=500N$. Then $MA=\frac{500}{50}=10$. So option A is correct.
## Step3: Analyze option B
Given $F_{in} = 10N$ and $F_{out}=20N$. Then $MA=\frac{20}{10}=2$, not 200. So option B is incorrect.
## Step4: Analyze option C
In a situation with high - friction or when the simple machine is not well - designed, it is possible to have $F_{out}=F_{in}$, so $MA = 1$ (no mechanical advantage). Option C is correct.
## Step5: Analyze option D
Simple machines are designed to provide a mechanical advantage (either greater than 1 for force multiplication or less than 1 for distance multiplication). So option D is incorrect.
## Step6: Analyze option E
The mass and height of an object do not directly determine the mechanical advantage required. Mechanical advantage is related to force input and output. So option E is incorrect.
# Answer:
A. You apply a force of 50 N to a shovel. The shovel applies a force of 500 N to the weed. The mechanical advantage is 10.
C. It is possible to use a simple machine and gain no mechanical advantage.