What is the work done by a muscle to lift a 70 kg weight to a height of 2 meters?

What is the work done by a muscle to lift a 70 kg weight to a height of 2 meters?

• A. 140 J
• B. 280 J
• C. 700 J
• D. 980 J

Answer: (D)

To determine the work done by a muscle in lifting a weight, you can use the formula for work done against gravity, which is calculated as: \[ \text{Work} = m \cdot g \cdot h \] where: - \( m \) is the mass of the object (in kilograms), - \( g \) is the acceleration due to gravity (approximately \( 9.8 \, \text{m/s}^2 \)), - \( h \) is the height the object is lifted (in meters). Plugging in the values from the question: - The mass \( m = 70 \, \text{kg} \), - The height \( h = 2 \, \text{m} \), - The acceleration due to gravity \( g \approx 9.8 \, \text{m/s}^2 \). Thus, the calculation is: \[ \text{Work} = 70 \, \text{kg} \cdot 9.8 \, \text{m/s}^2 \cdot 2 \, \text{m} \] Calculating this step-by-step: 1. Multiply the mass \( 70 \, \

To determine the work done by a muscle in lifting a weight, you can use the formula for work done against gravity, which is calculated as:

[ \text{Work} = m \cdot g \cdot h ]

where:

• ( m ) is the mass of the object (in kilograms),

• ( g ) is the acceleration due to gravity (approximately ( 9.8 , \text{m/s}^2 )),

• ( h ) is the height the object is lifted (in meters).

Plugging in the values from the question:

• The mass ( m = 70 , \text{kg} ),

• The height ( h = 2 , \text{m} ),

• The acceleration due to gravity ( g \approx 9.8 , \text{m/s}^2 ).

Thus, the calculation is:

[ \text{Work} = 70 , \text{kg} \cdot 9.8 , \text{m/s}^2 \cdot 2 , \text{m} ]

Calculating this step-by-step:

1. Multiply the mass ( 70 , \