If a radioactivite material has 1 hour half-life, how much of a 1000 g sample will be left after 6 hours

What were the models of ancient greek atoms?

Which statement is supported by Kepler's laws? The closer a planet is to the Sun, the faster it moves. The farther a planet is from the Sun, the faster it moves. As a planet moves away from the Sun, its gravitational force increases.

A deer with a mass of 146kg is running head on toward you with a speed of 17 m/s. You are going north. Find the momentum of the deer.

A solid magnesium flare has a mass of 1300 g and a volume of 743 cm3 what is the density of the magnesium

1. You are driving south on the 405. You are in traffic so your speed is 35 miles per hour, (35 mi/hr). Calculate your speed in m/sec. Assume that there 1.609 meters in every mile. 2. The Moon takes 27.25 days to make one revolution around the Earth.

Which of the following are vector quantities? check all that apply. a. time b. displacement c. force d. mass

Imagine you are on a bus with a helium balloon tied on a string tied to the seat in front of you. the bus stops short to avoid running over a rabbit and you are thrown forward. what happens to the balloon in relation to the bus? 1. the balloon pops.

Give one reason why the density of iron is higher than the density of oxygen

In which region of the periodic table do the elements NOT normally react chemically with other elements? A. metals B. metalloids C. nonmetals D. noble gases

A hot air ballon was a mass of 400 kilograms moves across the sky with 3200 joules of kinetic energy. the velocity of the balloon is