If an atom gains electrons, it becomes a

A. neutral atom.

B. negatively charged ion.

C. neutral ion.

D. negatively charged atom.

A hanging wire made of an alloy of nickel with diameter 0.07 cm is initially 2.7 m long. When a 43 kg mass is hung from it, the wire stretches an amount 1.48 cm. A mole of nickel has a mass of 59 grams, and its density is 8.9 g/cm3.

A camcorder has a power rating of 16 watts. If the output voltage from its battery is 7 volts, what current does it use?

As she climbs a hill a cyclist slows down from 25mi/hr to 6mi/hr 10 seconds. What is her deceleration?

How is the output of a machine calculated?

Which must exist for electric charges to flow?

What color of light can plants "see"?

Two tiny beads are 25 cm apart with no other charges or fields present. Bead A carries 10 µC of charge and bead B carries 1 µC. Which one of the following statements is true about the magnitudes of the electric forces on these beads

A ball is thrown straight up at 20 m. What is the balls velocity as it hits the ground?

Block 1 and Block 2 have the same mass, m, and are released from the top of two inclined planes of the same height making 30 degree and 60 degree angles with the horizontal direction, respectively.

Water waves change direction when they encounter water of different depths and begin to move at different wave speeds. This is called A. reflection B. constructive interference C. the Doppler effect D. refraction