15. For waves moving at a constant speed, if the wavelength is doubled, the frequency is

doubled

halved

unchanged

quadrupled

If you do not have oil in your car's engine, the parts that rub together in the engine get very hot. What does the oil do? A. It decreases the force of gravity. B. It increases the force of gravity. C. It decreases the force of friction. D.

The hormone that produces male secondary sex characteristics is

Which is an organic compound? Sample b contains cesium and chlorine, sample a contains carbon, hydrogen, and oxygen, or sample c contains hydrogen, oxygen, and phosphorus

The color of a star is A) unimportant B) determined by its location in the galaxy C) cannot be determined D) determined by its temperature

Human diseases such as tetanus syphilis and cholera are caused by small cells that lack nucleus the cells can enter the human body and cause disease. Which common name is associated with these cells. A antibody B toxin C bacteria D virus

What is the explanation for feather beds being warm

A student wearing frictionless in-line skates on a horizontal surface is pushed by a friend with a constant force of 47 N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 354 J?

Suppose a rocket ship in deep space moves with constant acceleration equal to 9.8 m/s2, which gives the illusion of normal gravity during the flight.

A canoeist on a lake throws a 0.145 kg baseball at 20.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially.

You short-circuit a 9 volt battery by connecting a short wire from one end of the battery to the other end. if the current in the short circuit is measured to be 18 amperes, what is the internal resistance of the battery?