Subject: Science, asked on 13/1/18

## why do we have to multiply 5/18 to convert km/hr into m/s  and 18/5 to convert m/s to km/hr ???

Subject: Science, asked on 7/1/18

## What is the difference between motion and displacement??

Subject: Science, asked on 5/1/18

## 1. What are obelisks? 2. Define an oscillation. 3. Where is quartz found? 4. What are the two methods of writing time in a day 5. Name the SI unit of time. 6. What is motion? 7. List the types of motion. 8. What does a speedometer measure?

Subject: Science, asked on 23/12/17

## Solve this : 57.  A person moves 7m towards east, then he took a left turn and moves 24m. Magnitude of  his displacement and distance is  (A)  31m, 25m                                              (B)  25m, 31m (C)  ​24m, 7m                                                (D)  ​None of these

Subject: Science, asked on 21/12/17

## Solve this : 35.  ​A particle moves with velocity v towards east for time t and with velocity 2v for time 2t along north. Find average velocity.

Subject: Science, asked on 21/12/17

## Solve this: Q.23. Calculate average velocity in the given v-t graph. (A) 29.5 m/s (B) 32 m/s (C) 30 m/s (D) 15.5 m/s

Subject: Science, asked on 20/12/17

## Q.59.  A person moves from point A to point B  along the arc of a circle as shown. Then the magnitude of its displacement is (A) 14 m (B) 7 m (C) $7\sqrt{2}$ m (D) None of these

Subject: Science, asked on 20/12/17

## Q). Amount of heat energy required to convert 20 g ice at to 20 g water at :- (A) 1800 Cal (B) 1000 Cal (C) 500 Cal (D) 2000 Cal

Subject: Science, asked on 20/12/17

## Solve this:

Subject: Science, asked on 19/12/17

## Please solve both the questions 68.  A body thrown vertically upwards reaches a maximum height of 4 m. It then returns to the ground.  The distance travelled by the body is ____________ m 69.  If a 100 m long train is travelling with a speed of 100 m/s, find the time taken (in sec) by it to cross a 400 m long bridge

Subject: Science, asked on 19/12/17

## 66. An Object moves from A to C as Shown in figure. Calculate the displacement Of the object(in metres). 67. Reading of a Kelvin scale is 280 K for a particular temperature. The reading on Celsius scale tor the same temperature is _______ $°$C 68. A body thrown vertically upwards reaches a maximum height of 4m. It then returns to the ground.  The distance travelled by the body is _______ m 69. If a 100 m long train is travelling with a speed of 100 m/s, find the time taken (in sec.) by it to cross a 400 m long bridge.

Subject: Science, asked on 18/12/17

## A car starting from rest gets uniformly accelerated & acquires a velocity of 108 km/h in 10 seconds. The average velocity of the car is (A) 15 m/s           (B) 72 km/h          (C) 10 m/s                 (D) 50 km/h

Subject: Science, asked on 18/12/17

## Solve this: Q. Displacement time graph of two particles A & B is given. Then,      (A) velocity of A is greater than B     (B) Velocity of B is greater than A     (C) velocity of both A & B are same     (D) None of these Subject: Science, asked on 16/12/17

## How do scientists determine the speed of a spacecraft on its way to a distant planet? Explain in detail.

Subject: Science, asked on 16/12/17

## MR SMITH LEAVES THE HOME AT 10 AM TO GO TO SHOPPING. HE WALKS TO THE STATION WHERE HE CATCHES THE TRAIN. HE GETS OFF THE TRAIN AT THE MALL. AFTER SHOPPING MR SMITH GOES HOME BY TAXI. THE TAXI LEAVES THE MALL AT 1PM AND REACHES HOME AT 1:45PM CALCULATE THE AVERAGE SPEED OF TAXI (TOTAL DISTANCE=12.5KM)

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