Erwin was measuring a radioactive substance in the laboratory. He measured 8.0 kg of substance X at noon Tuesday. At noon Friday, three days later, Erwin measured 1.0 kg of substance X. What is the half-life of substance X? Explain your answer.

What is noetic science?

If a body system, such as the digestive system, fails to work properly, what would happen to the organism

A 539 g ball strikes a wall at 14.4 m/s and rebounds at 13.8 m/s. The ball is in contact with the wall for 0.033 s. What is the magnitude of the average force acting on the ball during the collision? Answer in units of N.

The scientists makes an educated guess in " if, then" form. Which step of the scientific method is described?

Explain why the mean and standard deviation are not appropriate for particle size distributions

A person walks up a stalled escalator in 25 s. When standing on the same escalator, now moving, she is carried up in 16 s. How much time in seconds would it take her to walk up the moving escalator?

Is the following sentence true or false? Two atoms of the same element can have different numbers of protons.

Definition of mechanical weathering

If you double the force of an object what happens to the acceleration?

A particle (mass - 5 g. charge 30 mC) moves in a region of space where the electric field is uniform and is given by Ex 4.8 N/C, Ey-E. 0. If the velocity of the particle att-O is given by v,-40 m/s V, v-0, what is the speed of the particle at t3 s?