Which is the best example of an unbalanced force? A)A book resting on a shelf
b)A train accelerating from the station.
c) A chair sitting motionless
d) a car driving at a constant speed.
plz answer correctly

Ablock of steel has a density of 0.29lbs per cubic inch. if the block has dimensions of 1 inch by 1 inch by 3 inches, what is its weight? a. 0.29lbs b. 0.58lbs c. 0.87lbs d. 1lbs

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.