A train travels 90 kilometers in 4 hours, and then 82 kilometers in 1 hours. What is its average speed?

Which of the following is a form of kinetic energy? O A. Sound energy O B. Electrical energy O C. Nuclear energy O D. Potential energy

1. What reaction fuels the buring of the sun? combustion fission fusion transmutation

Dana uses a rope to pull a box that weighs 300 N across alevel surface with constant velocity. The rope makes an angle of 30above the horizontal and the tension in the rope is 100 N. What isthe coefficient of friction?

A 12 cm radius air duct is used to replenish the air of a room 9.2 m x 5.5 m x 4.5 m every 10 min. how fast does the air flow in the duct?

The CBR method of flexible pavement design gives an idea about the: A. quality of road-making material B. traffic intensities C. characteristics of soil D. All of the above

In what way would a digital thermometer be preferable to those from a liquid-based thermometer? Digital thermometer readings are easier to use when performing calculations.

Why does the core of the sun contain more helium and less hydrogen than the surface of the sun?

What happens to a light ray passing through the center of a lens?

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.870 m/s at an angle of 35.0° above the table, and it lands on the magazine 0.0770s after leaving the table. Ignore air resistance.

A force of 5 N accelerates an object. The object's mass is 50 g. What is the acceleration of the object? (Formula: F=ma)