If an object has luster, is brittle, and is a semi-conductor, what category would best describe it? A. Metal
B. Non-metal
C. Metalloids
D. Isotopes

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in

An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped