A mixture consists of saw dust, salt, and pebbles. Which of the following instruments or materials would not be useful in separating this mixture?

magnet

filter paper

screen

water

What causes precipitation fronts

How does specific heat affect the rate at which an object changes temperature

What is the new weight of a 10kg object on a planet that has twice the earths mass. (assume that the radius of the planet is the same as earths)

Atmospheric pressure decreases as we go higher up the earth's surface. give reasons

Which of the following is a natural disaster that can have a significant impact on human populations

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.