A 500. gram sample of nickle-63 has a half-life of 100. years and has decayed for 500. years. How much of the original 500. gram sample remains?

87.1 grams

574 grams

16,000 grams

15.6 grams

One situation indicates a physical change rather than a chemical change. Which situation indicates a physical change? A) Solid copper melts to form liquid copper. B) A firecracker explodes on the fourth of July.

James rode his bike 0.65 hours and traveled 8.45 km. What was his speed?

How much force is required (in Newton's) to accelerate a 4-kg skateboard, along with its 46-kg rider, at 3m/s2?

Write an essay describing and predicting the effects of fitness-related stress management techniques on the body.

A 2.0-kg object moving at 5.0 m/s encounters a 30-Newton restive force over a duration of 0.10 seconds. The impulse (magnitude only) experienced is object is approximately N-s

9. (True or False) During an early morning rain shower, Jim could see a rainbow to the north as the sun's rays in the east broke through the clouds, illuminating the landscape.

Is sugarcane renewable or nonrenwable and why

during a crash, an airbag inflates to stop a dummys forward motion. the dummy mass is 75 kg. if the net force is on the dummy is 825 N toward the rear of the car, what is the dumys deceleration

A bike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. What is her acceleration? Select one: a. 3.21 m/sec2 b. 1.75 m/sec2 c. 9.80 m/sec2 d. 2.24 m/sec2

What is the center of atom called?