A train engineer drives a train 235 km north along a straight track. Then he drives the train back south 126 km. Finally, he drives north again 45 km to his final destination. What is the engineer's total magnitude of its displacement?

Why does it take 10 times more energy to grow a kilogram of beef than a kilogram of wheat?

Which of these occur as part of gravitational redshift? Check all that apply. wavelength of light lengthenswavelength of light shortensfrequency of light increasesfrequency of light decreaseslight observed on Earth appears more red light observed on

Because not all stars are the same distance from the earth, it can be difficult to determine

Two loudspeakers in a plane, 6.0 mm apart, are playing the same frequency. If you stand 12.0 mm in front of the plane of the speakers, centered between them, you hear a sound of maximum intensity.

Why do scientists sometimes have to be philosophers?

There are 5,280 feet in 1 mile and 12 inches in one foot. How many inches are in a mile?

An anion is an atom that has lost electrons. True or False?

Question: Jane, looking for Tarzan, is running at top speed (4.5 m/s) and grabs a vine hanging vertically from a tall tree in the jungle.

Kim holds a pinwheel in the air and says it can be used to model a source of energy. Identify the type of energy Kim's pinwheel models. Explain the type of energy source used.

An example of a stable system