What kind of scientific investigations do not involve experiments?

How much work is done to move 3c of charge through a potential difference of 1.5v

What are good ways to remember formulas?

An anchor made of iron weighs 833 N on the deck of a ship. If the anchor is now suspended in seawater by a massless chain, what is the tension in the chain? (Note: The density of iron is 7800 kg/m3 and the density of seawater is 1025 km/m3)

If an object is thrown downward with an initial velocity of v 0 , then the distance it travels is given by sequals4.9tsquaredplusv 0t. An object is thrown downward from a cliff 400 m high and it travels 138.3 m in 3 sec.

If quarks always exist in pairs then why do protons and neutrons have three quarks, not four?

This part of the electromagnet spectrum produces heat and with special equipment can locate people at night. infrared waves microwaves X-rays gamma rays

An ambulance is traveling east at 51.6 m/s. Behind it there is a car traveling along the same direction at 32.3 m/s. The ambulance driver hears his siren at a frequency of 615 Hz. 32.3 m/s Car 51.

When a chemical reaction occurs with only one substance, what happens to the atoms of that substance?

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?

Which group of elements loses 1 electron easily?