A train travels 68 kilometers in 4 hours, and then 91 kilometers in 2 hours. What is its average speed?

What are the dates of the atlantic hurricane season

If a stationary object experiences a downward force of 12 n and an upward force of 12 n, what is the motion of the object?

A music tuner uses a 550 Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument?

A friend says, "Stars produce energy by a fusion chain reaction of helium into hydrogen." Evaluate the validity of this statement. A) It is an valid statement. Stars produce energy by a fusion chain reaction of hydrogen into helium.

Based on the law of conservation of energy. how can we reasonably improve a machines ability to do work? A. move the machine to a different gravitational field B. increase the friction between its moving parts C.

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)