4.

A 40 kg child and a 30 kg child want to balance themselves on a 4 meter, 50

kilogramn see-saw. Where should the fulcrum be placed?

You catch, tag, and release 50 fish back into a pond. Then, you catch 25 more fish, 5 of which are tagged. What is the best estimate of the number of fish in the pond? A. 100 fish B. 250 fish C. 400 fish D. 625 fish

How long will it take you to swim 100 meters if you swim at a speed of 12.5 m/s?

What is the kinetic energy of a 2,000-kg truck that moves at 5.0 m/s? 10,000 J, 50,000 J, 25,000 J, or 2,500 J

Can fly but have no wings. I can cry but I have no eyes. Wherever I go, darkness follows me. What am I?

Several processes form metal ore. Match each process to its description. volcanic activity weathering hydrothermal energy Rocks break down as they interact with air and water.

When will the earths core overheat and explode from the pressure buildup?

Which is the correctly balanced equation for the reaction of rust, Fe2O3, and hydrochloric acid, HCl? Fe2O3 + HCl → FeCl3 + H2O Fe2O3 + 3 HCl → 2 FeCl3 + H2O Fe2O3 + 6 HCl → 2 FeCl3 + 3 H2O Fe2O3 + 3 HCl → 2 FeCl3 + 3 H2O

How many DNA strands could you fit into a milimeter

A screwdriver with a 1-cm shaft and a 4-cm handle is used to tighten a screw. calculate the ideal mechanical advantage.

Plants make food through photosynthesis, a chemical reaction. What are the starting substances of the reaction?