A train travels 80 kilometers in 2 hours, and then 79 kilometers in 4 hours. What is its average speed?

Which statement explains why weather occurs more quickly in tropical rainforest? a. the dry conditions in tropical rain forests cause chemical weathering from blowing sand. b.

Write the first law of thermodynas law of thermodynamics for an adiabatic process.

Ronnie kicks a playground ball with an initial velocity of 16 m/s at an angle of 40° relative to the ground. What is the approximate horizontal component of the initial velocity?

Three rocks, each of varying mass and volume, are released from a window at the same time. The window is at height h above the ground.

What will happen if you take a cold soda out of the fridge on a hot day, condensation or evaporation?

During a demonstration of the gravitational force on falling objects to her class, Sarah drops an 11 lb. bowling ball from the top of the science building. Determine distance the ball has traveled after falling for 1.

A teacher wants to demonstrate that unheated water can boil at room temperature in a beaker within a bell jar connected to a vac-uum pump. However, the vacuum pump is faulty and can reduce pressures only to 15 kPa.

How many btus of heat energy are needed to raise the temperature of 99.6 lbs of water from 50 °f to 130 °f?

What is a different form of a characteristic, such as brown hair, is called

A book falls of the table and hits the floor. Is work done? Why?