There is a 50 g sample of Ra-229. It has a half-life of 4 minutes.

How much will be left after 12 minutes?

According to the diagram, in order for a solar eclipse to occur, the Earth, Moon, and Sun must A) form a right angle with the Moon in the middle. B) form a straight line with the Moon in the middle. C) form a right angle with the Earth in the middle.

Give examples of friction being useful and not useful in everyday life

A 4.0 newton force is used to pull a 2.00 kg box a distance of 3.00 meters. How much work is done on the cart? A. 36J B. 24J C. 12J D. 6 J

Oppositely charged objects attract each other this attraction holds electrons in Adams and hold on to one another in many compounds however ernest rutherfords model of the atoms failed to explain why electrons were not pulled into the aromic nicleus

Which statement describes the relationship between the rate of reaction and the temperature?

What would happen If a scuba tank heats up

Of the three types of radiation listed below, which is the least penetrating and which is the most penetrating? - alpha - beta - gamma

A DC voltmeter may be used directly to measure a) frequency b) polarity c) power factor d) power

Explain why the atomic mass of an element is a weighted-average mass

If the earth had no atmospheres at all what would the sky look like