A 500g sample of Potassium-40 is left to decay radioactively. After 3.9 x 109 years, about how many grams of Potassium-40 are expected to remain? [The half-life of Potassium-40 is 1.3 x 109 years.]

What scientific term is a well-tested explanation for a set of observations or experimental results?

A race car moving with a constant speed of 60 m/s completes one lap around a circular track in 50 s. What is the magnitude of the acceleration of the race car

Potential energy and kinetic energy are created when work is done to change a position (PE) or a state of motion (KE). Ignoring friction, how does the amount of work done to make the change compare to the amount of PE or KE created? a.

The speed of light is about 3.00 * 105 km/s. It takes approximately 1.28 seconds for light reflected from the moon to reach Earth. What is the average distance from Earth to the moon?

A 10 kg bowling ball would require what force to accelerate down an alleyway at a rate of 3 m/s2? F= M= A=

The grounded conductor and the grounding conductor are one and the same conductor and perform the same function.

Summarize Newton's First Law

13. How is 0.00069 written in scientific notation? A. 69 x 10-5 B. 6.9 x 104 C. 0.69 x 10-3 D. 6.9 x 10-4

A 1300 kg sports car accelerates from rest to 95 km/h in 7.4 s. What is the average power delivered by the engine?.

Two children playing on a frictionless garden gate invent a new game called "gate". The idea is that they will get on opposite sides of the gate and each push such that the gate does not move.