Work, Energy and Power Test

Result

Work, Energy and Power Test - 3

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

What is the velocity of the bob of a simple pendulum at its mean position, if it is able to rise to a vertical height of 20 cm? (g = 9.8 m/s²)

A
1.47 m/s

B
0.63 m/s

C
1.97 m/s

D
2.31 m/s
Question 2
1 / -0

A shell is fired from a canon with velocity v m/s at an angle θ with the horizontal direction. At the highest point in its path it explodes into pieces of equal mass. One of the pieces retraces its path to the canon and the speed in m/s of the other piece immediately after the explosion is _________.

A
3 v cosθ

B
2 v cosθ

C
3/2 v cos θ

D
√3/2 v cosθ
Question 3
1 / -0

A cord is used to lower vertically a block of mass m to a distance d at a constant downward acceleration of g/5. The work done by the cord on the block is

A
mgd/4

B
-4gmd/5

C
-3gmd/4

D
mgd
Question 4
1 / -0

The work done by the force is defined to be

A
the negative product of component of the force in the direction of the displacement and the magnitude of this displacement

B
the product of component of the force in the direction of the displacement and the magnitude of the displacement

C
the product of component of the force in the direction perpendicular to displacement and the magnitude of the displacement

D
the product of force and the magnitude of the displacement

Solution

Work done is given by

W = (Fcosθθ)d

here Fcosθθ is the component of applied force in direction of displacement and d is magnitude of displacement.
Question 5
1 / -0

In a graph of F(x) vs x, the area under the curve

A
represents the impulse of F(x)

B
represents energy of F(x).

C
represents work done by F(x).

D
represents the momentum of F(x).

Solution

Work done by a variable force is given by

W = ∫F(x)dx

above integration gives us area area under F and x.
Question 6
1 / -0

The power of a pump, which can pump 200 kg of water to a height of 50 m in 10 s, will be (g = 10 m/s²)

A
10 x 10³ W

B
20 x 10³ W

C
4 x 10³ W

D
6 x 10³ W
Question 7
1 / -0

In which case is the work done zero?

A
Force and displacement are at an angle of 45^∘

B
Force and displacement are in the same direction

C
Force and displacement are perpendicular to each other

D
Force and displacement are at an angle of 75^∘

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Work, Energy and Power Test - 3

Result

Work, Energy and Power Test - 3

Score

-

Rank

-

SHARING IS CARING

Question 1

1.47 m/s

0.63 m/s

1.97 m/s

2.31 m/s

Question 2

3 v cosθ

2 v cosθ

3/2 v cos θ

√3/2 v cosθ

Question 3

mgd/4

-4gmd/5

-3gmd/4

mgd

Question 4

the negative product of component of the force in the direction of the displacement and the magnitude of this displacement

the product of component of the force in the direction of the displacement and the magnitude of the displacement

the product of component of the force in the direction perpendicular to displacement and the magnitude of the displacement

the product of force and the magnitude of the displacement

Solution

Question 5

represents the impulse of F(x)

represents energy of F(x).

represents work done by F(x).

represents the momentum of F(x).

Solution

Question 6

10 x 103 W

20 x 103 W

4 x 103 W

6 x 103 W

Question 7

Force and displacement are at an angle of 45∘

Force and displacement are in the same direction

Force and displacement are perpendicular to each other

Force and displacement are at an angle of 75∘

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

10 x 10³ W

20 x 10³ W

4 x 10³ W

6 x 10³ W

Force and displacement are at an angle of 45^∘

Force and displacement are at an angle of 75^∘