Some students are planning an experiment. They need to be able to vary the strength of a magnet. Which type of magnet should they use? A. bar magnet B. electromagnet C. horseshoe magnet D. refrigerator magnet​

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?

Match these items. 1. coulombs __force 2. ohms __emf 3. centimeters __resistance 4. newtons __charge 5. volts __length