Which of the following is a sign that a chemical change has taken place when wood burns?

bubbles

rust

production of a liquid

production of heat

Two circular loops lie adjacent to each other on a tabletop. One is connected to a source that supplies an increasing current; the other is a simple closed ring.

How much power is used by a 6.0-V flashlight battery that draws 0.5 A of current

Which statement best describes acceleration? Acceleration is the rate of change of force of an object. Acceleration is the rate of change of the direction of an object. Acceleration is the rate of change of velocity of an object.

How much force does it take to accelerate a 2,000-kg car at 4 m/s A. 19,600 N B ... 002 N C. 8,000 N D. 500 N

The process of water vapor cycling in and out of the atmosphere with evaporation of water from the surface and precipitation of water back to the surface is called the

4. How far does a car travel in 90 seconds if it is traveling at a speed of 55 m/s?

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?

What is the force of gravity acting on a 2000-kg spacecraft when it orbits two Earth radii from the Earth's center (that is a distance r=6380 km above the Earth's Surface. The mass of the Earth is 5.98 x 1024 kg.

An LC circuit has a 6.00 mH inductor. The current has its maximum value of 0.570 A at t = 0s. A short time later the capacitor reaches its maximum potential difference of 66.0 V. What is the value of the capacitance?

The first law of thermodynamics states that ΔE = Q - W. Is this also a statement of the principle of conservation of energy? Yes, the heat added and the change in internal energy of the gas equal the work done by the piston.