What does it mean when someone says that knowledge cannot be assessed or measured without demonstration? How does this relate to academics?

Radon, the radioactive gas that contributes more than half the yearly dose to the average American, has a half-life of approximately 4 days. How many days does it take a radon source to decay to 1/128 of its original level of radioactivity?

A force acts on a 5kg object at rest. How fast will the object accelerate on a frictionless surface? A.) 4 m/s^2 B.) 15 m/s^2 C.) 25 m/s^2 D.) 100 m/s^2

The frequency of sound waves in air from a violin string are around 863 hz. if the speed of sound in air is 300 m/s (approximately), what is the wavelength of the sound waves?

A jetliner flies east 2000 miles from San Francisco to Chicago. It has an average air speed of 600 mph relative to the air.

Which statements describe the motion of a planet according to Kepler's second law? Check all that apply. The speed of a planet varies as it moves in its orbit. The speed of a planet is constant as it moves in its orbit.

At what distance from equilibrium is the energy of a sho half kinetic and half potential?

Why can you not measure the volume of water in the measuring cylinder accurately unless you look straight at the scale?

How can biologic weathering result in chemical weathering? A. Bacteria release acids and other agents that break down rock B. Large herds temple rocks and break up soil C. Root loosen soil and break rock

Volcanic eruption affects water drainage but what may that result in

The probability that a battery will last 10 hr or more is 0.8, and the probability that it will last 15 hr or more is 0.11. Given that a battery has lasted 10 hr, find the probability that it will last 15 hr or more