A girl whose mass is 50kg carries a box of mass 30kg up a flight of steps .there were 20 steps each 20cm high .she take to 16 seconds to climb up the steps. take g=10m/s. what is her weight

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9