How many days will it take for one half of the original amount of a radioactive substance to decay if the half-life is 30 days?

a. 3 days

b. 15 days

c. 30 days

d. 60 days

A data table shows the height of a person on his birthday each year for ten years. What is the the dependent variable? Provide evidence to support your claim, and explain your reasoning.

A wagon is pulled for a distance of 5 meters in 20 seconds with a work output of 75 j. what is correct unit label for power output?

If a person walks 1.3 m/s, how far will that person walk in 300 s?

The portrayal of death as a carriage driver is an example of

An astronomer would most likely use the doppler effect to question 12 options: 1) measure the color of a star. 2) measure the parallax of a star. 3) measure the brightness of a star. 4) measure the shift in the emission spectrum of a star.

A car slows down from 24 m/s to rest in a distance of 90 m. what was its acceleration, assumed constant? incorrect: your answer is incorrect. m/s2

Radar, the first link in the cosmic distance chain, is used to establish the baseline distance necessary for the second link, parallax. What baseline distance must we know before we can measure parallax?

What types of areas are more prone to floods?

would the phases of the moon be affected if the moon didn't make one rotation for each revolution of earth?

What kinetic energy has 1 tone car traveling at 15 m/s