21. True or false: During heat transfer heat always travels from the warmer object to the cooler object.

How much time would it take for he sound of the thunder to travel 2000 meters if sound travels a speed of 330 meters per sec

What type of rock is limestone? Describe how a limestone rock is likely to change over a long period of time.

Which of the following is a true statement? a) 390 nm blue light is higher in energy than 610 nm yellow light. b) Visible light is higher in energy than ultraviolet light.

A 80 mW laser beam is polarized horizontally. It then passes through two polarizers. The axis of the first polarizer is oriented at 30∘ from the horizontal, and that of the second is oriented at 60∘ from the horizontal.

A man is riding his 4-wheeler at 60 km/hr. If he is riding it constantly at this rate for 1.5 hours, how far did he ride?

A transformer has a primary coil with 700 turns and a secondary coil with 350 turns. If the output voltage is 410 volts, what is the input voltage? * a.) 245,000 Volts b.) 205 Volts c.) 2 Volts d.) 820 Volts

Your odometer of your car says 54 123 miles when you start your trip, your watch says 9 45 AM When you get to your estination the odometer says 54 miles and your watch says 11 45 AM What is your average velocity (assuming you were traveling due

Briefly explain how an electric motor works.

When is a hypothesis developed in the scientific method? before there is a question after a question has been identified and observations are made after an experiment if the experiment justifies one

Interactive LearningWare 4.1 reviews the approach taken in problems such as this one. A 1800-kg car is traveling with a speed of 14.0 m/s.