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Kinematics - Physics Questions asked by Filo students

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A spring is suspended from a fixed point and a force is applied. The position of a pointer attached to the bottom of the spring against a vertical ruler is recorded. Before the force is applied, the position of the pointer is

(225 \pm 2) mm

. After the force is applied, the position of the pointer is

(250 \pm 2) mm

. The extension of the spring is determined. What is the percentage uncertainty in the extension?

$1.6%$
$1.8%$
$8.0%$
$16%$

Topic:

Kinematics

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Views: 5,378

__________ measures the distance moved by a vehicle.

Topic:

Kinematics

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Views: 5,370

A का बायी ओर त्वरण

2 m / s^{2}

है एवं B का बायी ओर त्वरण

1 m / s^{2}

है। C का त्वरण होगा
a.

1 m / s^{2}

1 m / s^{2}

2 m / s^{2}

2 m / s^{2}

Topic:

Kinematics

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Views: 5,133

A 10 kg block is pulled in the vertical plane along a frictionless surface in the form of an arc of a circle of radius 10m. The applied force is 200N as shown in the figure. If the block started from rest at A, the velocity at B would be:
a. The speed at Q is

20 m / s

. b. The speed at Q is

203 m / s

c. The speed at Q is

103 m / s

. d. none of these

Topic:

Kinematics

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Views: 5,956

A : A dimensionless quantity may have unit.
R : Two physical quantities having same dimensions, may have different units. a. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1). b. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2). c. If Assertion is true statement but Reason is false, then mark (3). d. If both Assertion and Reason are false statements, then mark (4).

Topic:

Kinematics

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Views: 5,744

(A): A measurement which is less accurate is more precise.
(R): Precision tells only about the resolution of measurement but not about accuracy. a. Both (A) and (R) are true and (R) is the correct explanation of (A) b. Both (A) and (R) are true and (R) is not the correct explanation of (A) c. (A) is true but (R) is false d. Both (A) and (R) are false

Topic:

Kinematics

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Views: 5,317

(a) A particle is thrown from a height h horizontally towards a vertical wall with a speed v as shown in the figure. If the particle returns to the point of projection after suffering two elastic collisions, one with the wall and another with the ground, find the total time of flight. [Elastic collision means the velocity component perpendicular to the surface gets reversed during collision.]

(b) Touching a hemispherical dome of radius R there is a vertical tower of height

H = 4 R

. A boy projects a ball horizontally at speed u from the top of the tower. The ball strikes the dome at a height

\frac{R}{2}

from ground and rebounds. After rebounding the ball retraces back its path into the hands of the body. Find u.

Topic:

Kinematics

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Views: 5,115

(a) A particle starts moving at

t = 0

x - y

plane such that its coordinates (in cm) with time (in sec) change as

x = 3

y = 4 sin (3 t)

. Draw the path of the particle.
(b) If position vector of a particle is given by

r = (4 t^{2} - 16 t) \hat{i} + (3 t^{2} - 12 t) \hat{j}

, then find distance travelled in first 4 sec.

Topic:

Kinematics

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Views: 5,951

(A): Absolute error is unitless and dimensionless.
(R): Errors are considered in measured quantities, not in the given constants. a. Both (A) and (R) are true and (R) is the correct explanation of (A) b. Both (A) and (R) are true and (R) is not the correct explanation of (A) c. (A) is true but (R) is false d. Both (A) and (R) are false

Topic:

Kinematics

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Question 10

Views: 5,449

(A): Angular momentum and Plank's constant are dimensionally similar but they are not identical physical quantities
(R ) : Dimensionally simillar quantities need not be identical a. Both (A) and (R) are true and (R) is the correct explanation of (A) b. Both (A) and (R) are true and (R) is not the correct explanation of (A) c. (A) is true but (R) is false d. Both (A) and (R) are false

Topic:

Kinematics

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Question 11

Views: 5,094

A ball 4 s after the instant it was thrown from the ground passes through a point P, and strikes the ground after 5 s from the instant it passes through the point P. Assuming acceleration due to gravity to be

9.8 m / s^{2}

find height of the point P above the ground.

Topic:

Kinematics

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Question 12

Views: 5,747

A ball dropped from a point P crosses a point Q in t seconds. The time taken by it to travel from Q to R, if

P Q = Q R

2 t

2 t

(2 - 1) t

Topic:

Kinematics

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Question 13

Views: 5,411

A particle moves in a straight line with acceleration described by equation given below:

a = m x - \frac{v _{0}^{2}}{x _{0}}

The value of constant m isa.

\frac{v _{0}^{2}}{x _{0}^{2}}

- \frac{v _{0}^{2}}{x _{0}^{2}}

2 \frac{v _{0}^{2}}{x _{0}^{2}}

- 2 \frac{v _{0}^{2}}{x _{0}^{2}}

Topic:

Kinematics

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Question 14

Views: 5,541

A ball is dropped from the top of a building the ball takes 0.5 s to fall past the 3 m length of a window at certain distance from the top of the building. Speed of the ball as it crosses the top edge of the window is

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

v_{T} + v_{B} = 12 m s^{- 1}

v_{B} - v_{T} = 4.9 m s^{- 1}

v_{B} v_{T} = 1 m s^{- 1}

\frac{v _{B}}{v _{T}} = 1 m s^{- 1}

Topic:

Kinematics

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Question 15

Views: 5,504

A ball is dropped from the top of a building the ball takes 0.5 s to fall past the 3 m length of a window at certain distance from the top of the building. Speed of the ball as it crosses the top edge of the window is

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

3.5 m s^{- 1}

8.5 m s^{- 1}

5 m s^{- 1}

12 m s^{- 1}

Topic:

Kinematics

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Question 16

Views: 5,234

A ball is dropped from the top of a building. The ball takes

0.50

s to fall past the 3m length of a window, which is some distance below the top of the building.
(a) How fast was the ball going as it passed the top of the window?
(b) How far is the top of the window from the point at which the ball was dropped?
Assume acceleration g in free fall due to gravity to be

10 m / s^{2}

Topic:

Kinematics

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Question 17

Views: 5,095

A ball is projected as shown in figure. The ball will return to point:
a. O b. left to point O c. right to point O d. none of these

Topic:

Kinematics

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Question 18

Views: 5,209

A ball is projected from a cliff of height

h = 19.2

m at an angle a to the horizontal. It hits an incline passing through the foot of the cliff, inclined at an angle

θ

to the horizontal. Time of flight of the ball is

T = 2.4 s

. Foot of the cliff is the origin of the co-ordinate system, horizontal is x direction and vertical is y direction (see figure). Plot of y co-ordinate vs time and y component of velocity of the ball

(v_{y})

vs its x co-ordinate (x) is as shown. x and y are in m and time is in s in the graph.

[g = 10 m / s^{2}]

(a) Find the angle of projection a
(b) Find the inclination

(θ)

of the incline.
(c) If the ball is projected with same speed but at an angle

θ (=

inclination of incline) to the horizontal, will it hit the incline above or below the point where it struck the incline earlier?

Topic:

Kinematics

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Question 19

Views: 5,062

A ball is projected from the bottom of a tower and is found to go above the tower and is caught by the thrower at the bottom of the tower after a time interval

t_{1}

. An observer at the top of the tower sees the same ball go up above him and then come back at this level in a time interval

t_{2}

. The height of the tower is a.

\frac{1}{2} g t_{1} t_{2}

\frac{g t _{1} t _{2}}{8}

\frac{g}{g ( t _{1}^{2} - t _{2}^{2} )}

\frac{g}{2} (t_{1} - t_{2})^{2}

Topic:

Kinematics

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Question 20

Views: 5,611

A ball is projected horizontallu from a top of tower with a velocity of

10 m s^{- 1}

. Find the velocity of the ball after

0.5 s . T a k e

g= 10 ms^(-2)`.

Topic:

Kinematics

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