If the half - life of a sample of a radioactive substance is 30 seconds, how much would be left after 60 seconds?

How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2? 0.013 N 75 N 108 N 1080 N

If an object has more electrons than protons, what eletrical charge would it carry

Which radiation has a higher frequency than visible light

Why can matter in a gaseous state change its shape and volume

Which law states that absolute zero cannot be reached? a) second law of thermodynamics b) first law of thermodynamics c) third law of thermodynamics

What do you call a drug that increases speed

2. How is frequency described in mathematical terms?

During a summer with little rainfall, your house on a hill slope experiences an interval during which your well runs dry. You have to borrow water from your neighbor who lives downslope from you. Why does your neighbor have water when you don't?

If a force does not act parallel to the resulting displacement, what is the effect on the work done by the force?

A stick is a connection of two same - diameter metal rod 5 cm, and a length of both stick is 0,6m. The thermal conductivity of the first rod 92 cal / s. m.°C, and the second stick 50 cal / s. m.°C.