Why is a hollow pipe stronger than a solid pipe?

What is the definition of a molecule? And how are they made?

If an electric train is travelling south, which way is the smoke going?

What is the difference between methane and fluorinated gases

If the average speed of a car is 45 km/hr, how far can it travel in 40 minutes?

A 70 kg person travels to a planet where he weighs 1,750 N. What is the value of g on that planet?

A force is applied to a 2.8 kg mass and produces 3.9 m/s 2 acceleration. what acceleration would be produced by the same force applied to a 8.2 kg mass? answer in units of m/s 2.

When 2 objects collide and stick together this is referred to as

Fill in the blanks to complete each statement about the heating of Earth's surface. Earth takes in thermal energy from the Sun in a process called Sunlight strikes Earth's surface at different angles. This angle is called the angle of Done Intro

A 2.0-kg block is on a perfectly smooth (frictionless) ramp that makes an angle of 30^/circ30 ∘ with the horizontal. What is the force of the ramp on the block?

What is the difference between negative displacement and negative velocity?