Q: Speed of a body depends on

Speed is defined as Speed = \dfrac{\text{Distance travelled}}{\text{Time interval}} Hence speed depends both on time and distance travelled by the body.So both A and C are correct.

Question 1

Speed of a body depends on

Accepted Answer

Speed is defined as  Speed = \dfrac{	ext{Distance travelled}}{	ext{Time interval}} Hence speed depends both on time and distance travelled by the body.So both A and C are correct.

Question 2

A person travels a distance of  72 \ km  in  4  hours. Calculate speed in  m/s .

Accepted Answer

Distance,  S=72\ km Time,  t=4 \ hr Speed  =\dfrac{72}{4}km/hr\ = \dfrac{72}{4}	imes \dfrac{5}{18}\=5 \ m/s

Question 3

Name one unit of time bigger than a second.

Accepted Answer

1\ kilosecond=1000\ seconds

Question 4

Rain is falling vertically with a speed of 1.7 m/s. A girl is walking with speed of 1.0 m/s in the N - E (north-east) direction. To shield herself she holds her umbrella making an approximate angle $θ$ with the vertical in a certain direction. Then

Accepted Answer

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Question 5

Unit of Time is:

Accepted Answer

Unit of time is second.While metre and kilometre are units of length.

Question 6

A dancer demonstrating dance steps along a straight line. The position-time graph is given below.Find the average velocity of the dancer during the time interval between t  =  4.5 s to t  =  9 s

Accepted Answer

Displacement = final position - initial positionFrom graph final position is zero at  9\ s .From graph initial position is  4\ m  at  4.5\ s .Here, displacement  =-4\ m Time taken,  t=9-4.5 \Rightarrow t = 4.5\ s Average velocity (V_{avg}) V_{avg} \displaystyle = \dfrac{displacement}{time} \Rightarrow V_{avg}= \displaystyle \dfrac{-4}{4.5}   \Rightarrow V_{avg} = -0.89  m  s^{-1}

Question 7

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Accepted Answer

We know that  1 decade is equal to 10 years.So,   100   \ years  = \dfrac{100 }{10} \ decades = 10 \ decades So, the assertion statement is true.Reaon statement is also true and it explains the assertion very well.

Question 8

A body at rest cannot have ______ and ______.

Accepted Answer

A body at rest can not have speed and velocity because distance and displacement do not change with time.Answer: velocity and speed

Question 9

A dancer demonstrating dance steps along a straight line. The displacement time graph is given.Find the average speed for the dance step depicted by CD.

Accepted Answer

Average speed is defined as the ratio of the distance covered to the total time taken .Average speed  s_{av} = \dfrac{ Distance \ covered}{ time \ taken} For step CD Initial position is  4 , final position is  0 , hence distance covered  =4 \ m Total time is  6-4 = 2 \ sec So average speed is  s = \dfrac{4}{2}=2\ m/s So option  B  is correct.

Question 10

A dancer demonstrating dance steps along a straight line. The position time graph is given. Find the average velocity for the dance step depicted by AB.

Accepted Answer

For the dance step depicted by AB :Path length  =  0;Displacement  =  0Time taken, t  =  1 sAverage velocity  = \displaystyle \dfrac{displacement}{time \ taken}  \displaystyle = \dfrac{0}{1} =0

Motion And Time

Physics
292 Views

Speed of a body depends on

A person travels a distance of $72 k m$ in $4$ hours. Calculate speed in $m / s$ .

Name one unit of time bigger than a second.

Rain is falling vertically with a speed of 1.7 m/s. A girl is walking with speed of 1.0 m/s in the N - E (north-east) direction. To shield herself she holds her umbrella making an approximate angle $θ$ with the vertical in a certain direction. Then

Unit of Time is:

A dancer demonstrating dance steps along a straight line. The position-time graph is given below.

Find the average velocity of the dancer during the time interval between t $=$ 4.5 s to t $=$ 9 s

100 years make 10 decades.

Every century is divided into 10 decades.

A body at rest cannot have and .

A dancer demonstrating dance steps along a straight line. The displacement time graph is given.

Find the average speed for the dance step depicted by CD.

A dancer demonstrating dance steps along a straight line. The position time graph is given. Find the average velocity for the dance step depicted by AB.

Motion And Time

Physics 292 Views

Speed of a body depends on

A person travels a distance of 72 km in 4 hours. Calculate speed in m/s.

Name one unit of time bigger than a second.

Rain is falling vertically with a speed of 1.7 m/s. A girl is walking with speed of 1.0 m/s in the N - E (north-east) direction. To shield herself she holds her umbrella making an approximate angle θ with the vertical in a certain direction. Then

Unit of Time is:

A dancer demonstrating dance steps along a straight line. The position-time graph is given below. Find the average velocity of the dancer during the time interval between t = 4.5 s to t = 9 s

100 years make 10 decades.

Every century is divided into 10 decades.

A body at rest cannot have ______ and ______.

A dancer demonstrating dance steps along a straight line. The displacement time graph is given. Find the average speed for the dance step depicted by CD.

A dancer demonstrating dance steps along a straight line. The position time graph is given. Find the average velocity for the dance step depicted by AB.

Physics
292 Views

A person travels a distance of $72 k m$ in $4$ hours. Calculate speed in $m / s$ .

Rain is falling vertically with a speed of 1.7 m/s. A girl is walking with speed of 1.0 m/s in the N - E (north-east) direction. To shield herself she holds her umbrella making an approximate angle $θ$ with the vertical in a certain direction. Then

A dancer demonstrating dance steps along a straight line. The position-time graph is given below.

Find the average velocity of the dancer during the time interval between t $=$ 4.5 s to t $=$ 9 s

A body at rest cannot have and .

A dancer demonstrating dance steps along a straight line. The displacement time graph is given.

Find the average speed for the dance step depicted by CD.