What substance speed up speeds up a chemical reaction

What are the two ways in which weathering can occur

In an experiment you find the mass of a cart to b 250 grams what is the mass of the cart in kilograms

A wire loop of radius 0.50 m lies so that an external magnetic field of magnitude 0.40 T is perpendicular to the loop. The field reverses its direction, and its magnitude changes to 0.20 T in 2.5 s.

An ant carries food at a speed of 1 cm/s. How long will it take the ant to carry a cookie crumb from the kitchen table to the ant hill, a distance of 50 m? Express your answer in seconds, minutes and hours.

Which term is the product of force and distance? A) power B) work C) net force D) acceleration

Which has greater kinetic energy: a bullet that has a mass of 0.05 kg travelling at 2500 m/s, or a lorry that has a mass of 4500 kg and is moving at 50 m/s?

Bio mass, sun, wind, water

What is the mass of 5 moles of gold

A crane lifts a 400 N crate full of baked beans 15 m. How much work was done by the crane?

High altitude high velocity rivers of air are called