A man weighs $80 k g$ . He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $5 m / s^{2}$ . What would be the reading on the scale?

Open in App

Solution

Step 1: Given
Mass of the man: $m = 80 k g$
Acceleration of the lift: $a = 5 m / s^{2}$
Acceleration due to gravity: $g = 10 m / s^{2}$
Step 2: Formula used
Normal force acting on man will be $N = m (g + a)$ .
Step 3: Reading on weighing scale
Substitute the values in the formula.
$N = m (g + a) = 80 (10 + 5) = 80 \times 15 = 1200 N$
Hence, the reading on the scale will be 1200 N.

Suggest Corrections

Similar questions

Q. A man of mass

70

k g

stands on a weighing scale in a lift which is moving.
(a) Upwards with a uniform speed of

10

m s^{- 1}

.
(b) Downwards with a uniform acceleration of

5

m s^{- 2}

.
(c) Upwards with a uniform acceleration of

5

m s^{- 2}

.
What would be the reading on the scale in each case?
(d) What would be the reading if the lift mechanism failed and it hurtled down freely under gravity?

A man of mass 70 kg stands on a weighing scale in a lift which is moving

(a) upwards with a uniform speed of 10 m s^–1,

(b) downwards with a uniform acceleration of 5 m s^–2,

What would be the readings on the scale in each case?

(d) What would be the reading if the lift mechanism failed and it hurtled down freely under gravity?

Q. A man weighs 80 kg He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of

5 m / s^{2} .

What would be the reading on the scale ?

(g = 10 m / s^{2})

Q. A man weighs

80 k g

. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of

5

m / s^{2}

. What would be the reading on the scale.

A man weighs $80 k g$ . He stands on a weighing scale in a lift that is moving upwards with a uniform acceleration of $5 m s^{- 2}$ . What would be the reading on the scale? $(g = 10 m s^{- 2})$

Join BYJU'S Learning Program

A man weighs 80kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5m/s2. What would be the reading on the scale?

A man weighs $80 k g$ . He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $5 m / s^{2}$ . What would be the reading on the scale?