Why gaps are left between rails while laying railway tracks

Explain in a simple way, how water erosion by groundwater can form a cave?

NaCI is__ an acid a base a salt

What happens when the molecules in a steel bar absorb energy, and start moving quickly?

Does wind have atoms and molecules in it?

Which of these is a TRUE statement? A) Sound travels through gases easier than liquids. B) Sound travels through solids easier than liquids. C) Sound sometimes travels easier through gases than solids.

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass

Drivers are able to see objects ahead of them because light travels through windshields.