What are some indicators that a chemical reaction is occurring? Check all that apply.

the formation of bubbles

a change in size

a change in color

the formation of a liquid

the formation of a precipitate

How many horsepower does a 1100 watt microwave have

Which car is harder to stop and why? Calculate the momentum of cars A and B, and then answer the question Car A: Mass: 1,000 kilograms Velocity: 40 meters/second Car B: Mass: 4,000 kilograms Velocity: 10 meters/second

The power of motor is 50 w the motor drags a 2 object horizontally at a constant speed of 10m/s along a rough floor. What is the frictional force between the object and the floor

A doorknob makes it easier to twist a door latch in or out. How does a doorknob do this? A. by reducing the distance over which the input force is applied B. by decreasing the amount of input force needed to move the latch C.

How are producers and consumers different?

Under what circumstances can air resistance exercises ignored?

How does friction affect all moving objects?

A force of 5N compresses a spring by 4cm. Find the force constant of the spring.

Which of the following equations are balanced correctly? A: Cu + H2O → CuO + H2 B: Zn + HCl → ZnCl2 + H2 C: 2C4H10 + 13O2 → 8CO2 + 10H2O D: 2Ag2O → 4Ag + O2

Two identical objects are moving directly toward one another at the same speed v. ~v - ~v m m What is the total kinetic energy of the system of the two objects?