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Byju's Answer

Standard XII

Physics

Newton's Second Law

A man of mass...

Question

A man of mass 'm' stands on a weighing machine in a lift
List - I List-II
(a) Lift moves up with uniform acceleration a
(d) mg
(b) Lift moves down with uniform acceleration a (e) m(g $+$ a)
(c) Lift moves down with uniform velocity (f) m(g-a)

a \to e, b \to f, c \to d,

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a \to d, b \to f, c \to e,

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a \to d, b \to e, c \to f,

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a \to f, b \to d, c \to e,

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Solution

The correct option is A $a \to e, b \to f, c \to d,$
When the lift moves $U P$ with uniform acceleration $a$ $P s e u d o$ force on the man is $m a$ downward.
Net downward force is $m g + m a$ . Hence, $e$

When the lift moves $d o w n$ with uniform acceleration $a$ $P s e u d o$ force on the man is $m a$ upward.
Net downward force is $m g + m a$ . Hence, $f$

When the lift moves down with $u n i f o r m v e l o c i t y$ , only force acting is gravity.

Hence net force on man is $m g$ . Hence, $d$

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Similar questions

Q. A man of mass

m

stands on a weighing machine in a lift

\begin{matrix} List-I & List-II Lift moves & reading of machine a) up with uniform acceleration ' a' & e) m g b) down with uniform acceleration ' a' & f) m (g + a) c) down with uniform velocity & g) m (g - a) d) freely falling lift & h) 0 \end{matrix}

Q. A man of mass

m

stands on a weighing machine in a lift

\begin{matrix} List-I & List-II Lift moves & reading of machine a) up with uniform acceleration ' a' & e) m g b) down with uniform acceleration ' a' & f) m (g + a) c) down with uniform velocity & g) m (g - a) d) freely falling lift & h) 0 \end{matrix}

Match the items in the second list with corresponding items from the first list

$\begin{matrix} L i s t I & L i s t I I (A) & V a r i a t i o n o f g w i t h h e i g h t (f o r a n y h e i g h t) & e & g^{'} = g (1 - \frac{2 h}{R}) (B) & V a r i a t i o n o f g w i t h h e i g h t (f o r s m a l l h e i g h t s h << R) & f & \frac{G M}{R^{2}} (C) & V a r i a t i o n o f g w i t h d e p t h & g & g^{'} = \frac{g R^{2}}{(R + h)^{2}} (D) & g o n t h e s u r f a c e o f t h e p l a n e t & h & g^{'} = g (1 - \frac{d}{R}) \end{matrix}$

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 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?

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List - I	List-II
(a) Lift moves up with uniform acceleration a	(d) mg
(b) Lift moves down with uniform acceleration a	(e) m(g $+$ a)
(c) Lift moves down with uniform velocity	(f) m(g-a)

A man of mass 'm' stands on a weighing machine in a liftList - I List-II(a) Lift moves up with uniform acceleration a (d) mg(b) Lift moves down with uniform acceleration a(e) m(g+a)(c) Lift moves down with uniform velocity(f) m(g-a)

A man of mass 'm' stands on a weighing machine in a lift
List - I List-II
(a) Lift moves up with uniform acceleration a
(d) mg
(b) Lift moves down with uniform acceleration a (e) m(g $+$ a)
(c) Lift moves down with uniform velocity (f) m(g-a)