Science>Physics>Work and Energy>Power

EASY

Earn 100

Explain the term power in terms of energy.

Important Questions on Work and Energy

EASY

Science>Physics>Work and Energy>Power

State and define the SI unit of power.

EASY

Science>Physics>Work and Energy>Power

1 horse power (HP)

is equal to:

HARD

Science>Physics>Work and Energy>Power

A person of 75 kg climbs up to a height of 5 m in 25 sec. Calculate the power consumed by the person. (g=10m/s²)

EASY

Science>Physics>Work and Energy>Power

How is the unit horsepower related to the SI unit of power?

EASY

Science>Physics>Work and Energy>Power

A person of mass

100 kg

reaches a height in

10 seconds

. Find the power used by the person (

g = 10 \frac{m}{s^{2}}

).

MEDIUM

Science>Physics>Work and Energy>Power

A boy of mass

50 kg

runs a stair case of

45

steps in

9 \sec

. If the height of each steps is

15 cm

, find his power. (Take

g = 10 {ms}^{- 2}

).

EASY

Science>Physics>Work and Energy>Power

A crane

' A'

lifts a heavy load in

5 seconds

, whereas another crane

' B'

does the same work in

2 seconds

. Compare the power of crane

' A'

to that of crane

' B'

.

MEDIUM

Science>Physics>Work and Energy>Power

A man weighing

500 N

carried a load of

100 N

up a flight of stairs

4 m

high in

5 seconds

. What is the power?

EASY

Science>Physics>Work and Energy>Power

A water pump raises

50 kg

of water through a height of

25 m

in

5 s

. Calculate the power which the pump supplies. (take

g = 10 \frac{m}{s^{2}}

)

MEDIUM

Science>Physics>Work and Energy>Power

How much electrical energy in joules does a

100 watt

lamp consume in

1 minute

?

EASY

Science>Physics>Work and Energy>Power

A boy weighing

40 k g

carries a box weighing

20 k g

to the top of a building

15 m

high in

25 s

. Calculate the power,

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

MEDIUM

Science>Physics>Work and Energy>Power

How much electrical energy in joules does a

100 w a t t

lamp consume in

1 second

?

EASY

Science>Physics>Work and Energy>Power

A man carrying a bag of mass

25 kg

climbs up to a height of

10 m

in

50 s

. Calculate the power delivered by him to the bag. (take

g = 10 m / s^{2}

)

EASY

Science>Physics>Work and Energy>Power

Five electric fans of

120 watts

each are used for

4 hours

. Calculate the electrical energy consumed in kilowatt-hours.

EASY

Science>Physics>Work and Energy>Power

A boy of mass

50 kg

runs up a staircase of

45

steps in

9 s

. If the height of each step is

15 cm

, find his power. Take

g = 10 m s^{- 2}

.

EASY

Science>Physics>Work and Energy>Power

How much energy is used for boiling water in a

2 kW

kettle for

10 minutes

? Calculate it in watt-hour.

EASY

Science>Physics>Work and Energy>Power

Who has more power, labourer A completing a given work in

3

hours or labourer B who completes the same work in

5

hours?

EASY

Science>Physics>Work and Energy>Power

Pratyush can run at a speed of $8 \frac{m}{s}$ against the frictional force of $10 N$ . His friend Adarsh can move at a speed of $3 \frac{m}{s}$ against the frictional force of $25 N$ . Who is more powerful and why?

MEDIUM

Science>Physics>Work and Energy>Power

A boy of mass

45 kg

climbs up

20

steps in

20

seconds. If each step is

25 cm

high, calculate the power used in climbing. (take

g = 10 \frac{m}{s^{2}}

)

EASY

Science>Physics>Work and Energy>Power

A boy of mass

50 kg

runs up a staircase of

60

steps in

9 s

. If the height of each is

15 cm

, find his power. (take

g = 10 \frac{m}{s^{2}}

)