A60.0-kg person rides in elevator while standing on a scale. the elevator is traveling downward butslowing down at a rate of 2.00 m/s2. the reading on the scale is closest toa) 589 n. b) 708 n. c) 469 n. d) 120 n.

C) 469 N

Explanation:

The reading on the scale corresponds to the normal reaction exerted by the scale on the person, R.

There are two forces acting on the person:

- Its weight (acting downward), equal to , where m = 60 kg is the mass of the person and g = 9.81 m/s^2 is the acceleration due to gravity

- The normal reaction of the scale, R, acting upward

According to Newton's second law, the resultant of these two forces must be equal to the product between mass and acceleration:

where we know that since the elevator is traveling downward at 2.00 m/s^2. Solving the equation for R, we find

real, smaller and upside-down.   so the answer should be b.

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000