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

First, we verified that magnet movement would induce a current. Each time the magnet moved near the wire loop. whether it was moving forward or in reverse, a current registered. When the magnet was stationary, a current of milliamps was generated.

How many chickens does it take to kill an elephant?

A car moving at 10.0 m/s crashes into a barrier and stops in 0.050 s. There is a 20.0-kg child in the car. Assume that the child's velocity is changed by the same amount as that of the car, and in the same time period.

Does an object need a force to start moving

How is energy transferred throughout the roller coaster

For resonance to occur, the object must experience a frequency equal to its what? amplitude period wavelength natural frequency

Rasheed runs a football 10 meters east, turns and runs the football 6 meters west. If his velocity during this run is found to be 3 meters/second, how long does this take Rasheed to complete this run?

What is the approximate weight of a 20-kg cannonball on the moon if the acceleration due to gravity is 1.6m/s^2

A man consumes 2245 kcal of food in one day, converting most of it to maintain body temperature. If he loses half this energy by evaporating water (through breathing and sweating), how many kilograms of water evaporate?

If an eagle and a bumblebee are traveling at 8km/hr which has more momentum?