in which of the situations listed below is energy being transferred as heat to the system in order for the system to do work? In which situa tion is work being done on the system in order for energy to be trans- ferred from the system as heat? a. Two sticks are rubbed together to start a fire. b. A firecracker explodes. c. A red-hot iron bar is set aside to cool.

Answer:

thermal energy

Friction does negative work and removes some of the energy the person expends and converts it to thermal energy. The net work equals the sum of the work done by each individual force. The forces acting on the package are gravity, the normal force, the force of friction, and the applied force.

Explanation:

Answer:

Explanation:

Thermal energy due to heat coming in from rubbing like rubbing your hand and it feel warm

Answer:Static Electricity

Explanation:

Answer:

C. 1.4 m/s² right

Explanation:

Apply Newton's second law.  Take right to be positive and left to be negative:

∑F = ma

175 N − 100 N = (55 kg) a

a = 1.4 m/s²

The couch accelerates to the right at 1.4 m/s².

Final answer:

To find the acceleration of the couch, use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration. The net force is calculated by subtracting the forces applied by the two individuals pushing in opposite directions. By plugging in the given values and solving the equation, the acceleration of the couch is found to be approximately 1.4 m/s² to the right.

Explanation:

To find the acceleration of the couch, we need to use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration. In this case, the net force is the difference between the forces applied by Dale and Alex, since they are pushing in opposite directions.

The net force can be calculated as 175 N (force applied by Alex) minus 100 N (force applied by Dale), which equals 75 N. The mass of the couch is given as 55 kg. Plugging these values into the equation, we get:

Net force = mass × acceleration

75 N = 55 kg × acceleration

Dividing both sides of the equation by 55 kg gives us:

acceleration = 75 N ÷ 55 kg ≈ 1.4 m/s²

Since the net force is positive (to the right) and greater than zero, the acceleration of the couch is also to the right. Therefore, the correct answer is 1.4 m/s² right (option C).

Learn more about Newton's second law of motion here:

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