Which change is the best example of a physical change?

1) a cookie baking

2) paper burning

3) ice cream melting

4) a nail rusting

An 85 kg construction worker has 37,485 J of gravitational potential energy. To the nearest whole number, the worker is m above the ground.

Electrical wire with a diameter of. 5 cm is wound on a spool with a radius of 30 cm and a height of 24 cm. a) Through how many radians must the spool be turned to wrap one even layer of wire? b) What is the length of this wound wire?

The density of oxygen is 1.43 x 10 - 3 kg/m3. If a canister of oxygen has a mass of 0.2 kg, find the volume.

A soccer player is running upfield at 10 m/s and comes to a stop in 3 seconds facing the same direction. What is his acceleration?

An astronaut in his space suit and with a propulsion unit (empty of its gas propellant) strapped to his back has a mass of 146 kg. The astronaut begins a space walk at rest, with a completely filled propulsion unit.

The vapor pressure of ethanol at 25 degrees C is 7.83 kPa. Calculate the vapor pressure in atm. Round answer to 3 significant digits.

According to Newton's second law of motion acceleration or an object depends upon the ___ of the object and the ___ Acting on it. I'm confused on what the blanks are. I can't find them.

What is the concentration of H + ions at a pH = 7?

Suppose that Paul D. Trigger fires a bullet from a gun. Will the speed of the bullet leaving the muzzle will be the same as the speed of the recoiling gun? Explain.

A certain rock contains large jagged pieces of other rocks cemented by fine particles what type of rock is this explain