What are the 4 main signs of a chemical reaction?

What is indigo made from

If a 0.200-kilogram ball sits on a shelf 2.00 meters from the floor, how much mechanical energy (me) does it possess?

A beam of hydrogen molecules (h2) is directed toward a wall, at an angle of 55 with the normal to the wall. each molecule in the beam has a speed of 1.0 km/s and a mass of 3.3 1024 g. the beam strikes the wall over an area of 2.

a box has mass 60 kg and it is lying on the earth surface occupying an area of 6000 CM square then the pressure exerted by it on the ground is equal to

The impact of a sufficiently large asteroid or comet is one of the theories that have been put forward to explain why dinosaurs no longer exist. True or False

While playing with her 5 year old cousin, a Physics 135 student pushed him forward on his scooter. She pushes with a force of 50 Newtons for 3.5 seconds. If the boy and the scooter together have a mass of 30 kg, what is their final velocity? a. 2.

3. A 120.0 V generator supplies 3.0 kw of power. How much current ca the generator deliver?

An apple drops from a tree and hits the ground in 1.5s what is its speed just before it hits the ground?

Sound travels slow in cold air. Why does the speed of sound depend on air temperature?

A tow truck pulls a 500 kg car so that the car accelerates 2 m/s2. What is the net force on the car? 250 N 498 N 1000 N 502 N