What essential characteristic does a good experiment have? a. a control group is given the experimental treatment. b. a single variable is tested. c. a control is used. d. both b and c

When waves strike an object and bounce off, what has occured

Is eureka wire a better conductor than copper

The magnetic field of a bar magnet is the strongest ___. A: it is the same throughout the magnet B: at the poles of the magnet C: only on the north pole side of the magnet D: in the middle of the magnet

A 1.00 kg block of ice, at - 25.0°C, is warmed by 35 kJ of energy. What is the final temperature of the ice?

Describe the processes of fuel ignition and combustion?

Two masses are separated by 1 m. suppose the masses are moved so they are 2 m apart how will the gravitational force change

Bob rubs a piece of fur on a hand rubber rod, giving the rod a negative charge. what happens?

The period of a simple pendulum is 3.8 s. the length of the pendulum is doubled. what is the period t of the longer pendulum? t = s

True or false - sound waves can travel across outer space.

In which one of the following locations can a person hear the echo of a sound? a. At least 33.2 meters behind the reflecting surface b. Less than 16.6 meters in front of the reflecting surface c. Less than 33.2 meters behind the reflecting surface d.