The standard unit of radiation related to biologic hazard is the:

A. curie

B. roentgen

C. neutrino

D. bequerel

Lacrimal bones form the walls of the

Once an object enters orbit, what keeps the object moving sideways? a. inertiab) gravityc) centripetal forced) air resistance

The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed? A. 25 g B. 100 g C. 75 g D. 50 g

If a student tried to lift a 350 N box upwards with a lever that is 75 cm long, how much force would they need to provide given a fulcrum 20 cm away from the box. 1312.5 N. 93.3 N. 65.6N. 2333N.

When measuring weight on a scale that is accurate to the nearest 0.1 pound, what are the real limits for the weight of 145 pounds?

A tuba creates a 4th harmonic of frequency 116.5 Hz. When the first valve is pushed, it opens an extra bit of tubing 0.721 m long. What is the new frequency of the 4th harmonic? (Hint : Find the original length.)

In the early 19th century Christian Doppler, an Austrian physicist, proposed a theory regarding the properties of a moving source of sound. This is now known as Doppler's law or the Doppler effect. What does this law state?

Legend says that archimedes, in determining whether or not the king's crown was made of pure gold, measured its volume by the water displacement method.

Resonance always causes the object resonating to fall apart or be destroyed. true or false

An insoluble solid material that is produced in double replacement reactions is called