An isotope has a half life of 2.5 minutes how many half - lives go by in 17.5 minutes

Aspect of the physical world

A potential difference of 3.10 nV is set up across a 2.09 cm length of copper wire that has a radius of 2.32 mm. How much charge drifts through a cross section in 3.05 ms? Assume that the resistivity of copper is 1.69 * 10-8 Ω·m.

Which of these is an example of a chemical change? Question 10 options: mixing a salad dressing digesting a salad preparing a salad dicing an onion

4. A year 11 pupil with a mass of 55kg swinging back on their chair and falling off it at a speed of 0.6m/s. What is his kinetic energy?

Two runners start a race. After 2 seconds, they both have the same velocity. If they both started at the same time, how do their average accelerations compare?

Which of the following situations would produce an average velocity of zero? A) a round-trip to school and back B) a horse galloping in a field C) the criss-crossing path of a flying bug D) a trip, first to the moon, then onto Mars

A 111.6 g sample of iron was heated from 0°C to 20°C. It absorbed 1004 J of energy. What is the specific heat capacity of iron?

A car is driving towards a brick wall at a constant velocity (don't try this at home!) and the driver honks the horn of the car. the sound of the horn reflects from the wall and the echo is heard by the driver.

Mass number of an atom with 11 protons

Which of the following elements is the most reactive? Beryllium Calcium Magnesium Barium