If a2+b2+4c2 = ab+2bc+2ca. Prove that a = b = 2c Multiplying both side by 2 we have. 2. a2 + 2. b2 + 2.4c2 = 2.ab + 2.2bc + 2.2ca 2. a2 + 2. b2 + 2.4c2 = 2ab + 4bc + 4ca 2. a2 + 2. b2 + 2.4c2 – 2ab … Read more
गर्मी का मौसम भारत में मई और जून के महीने में आता है । हम इस मौसम में बहुत असहज महसूस करते हैं। क्योंकि गर्मी का मौसम बहुत आसान मौसम नहीं है। इस गर्म से छुटकारा पाने के लिए मैने बहुत पहले से एक शांत जगह पर गर्मी की छुट्टी बिताने की योजना बनाई थी । हम … Read more
Types of Motion: Rest: A body is said to be at rest when it does not change its position with respect to their environment and time. For example house, tower, tree etc. Motion:A body is said to be in motion when it changes its position with respect to environment and time. For example moving car, … Read more
Satellites are small celestial bodies which revolve around planets.Watch the image where moon is shown as a planet of the Earth. As the planets revolve around the sun, the satellites move with them. As a result , satellites also revolve around the sun .Like planets ,satellites shine by reflecting light from the sun. All planets … Read more
By JANE TAYLOR( 1783–1824)Question 1 : What is the colour of the flower? Question 2 : What does the poet mean by a ‘rosy bower’?(tick the correct meaning )- Options are: a) shower of roses, b) A pleasant place in the shade under rose plants, c) A hut covered with roses? Question 3 :Why does … Read more
Problem : A body moving with constant acceleration travels the distance 3 metre and 8 metre respectively in one second 2 second. Calculate the 1) initial velocity and 2) the acceleration of body. Data given: Distance(s1) = 3m Time taken (t1) to travel 3 m =1 secondDistance(s2) = 8m Time taken (t2) to … Read more
Walking at 3/5 of his usual speed, a man is 4 hours too late. Find his usual time. Suppose the usual speed of the man be x km/hr .Let distance travelled be D km Therefore usual Time taken = D / x.’. walking speed = 3/5. x Let distance travelled be D km we can … Read more
Problem : A body moves from rest with uniform acceleration and travels 270 metre in 3 seconds. Find the velocity of the body at 10 seconds after the start. Initial velocity (u)= 0Distance(s) = 270m Time taken (t)=3s final velocity after 10 s (v10)= ? First we will calculate acceleration.We know s = ut + … Read more
Problem : When brakes are applied to a bus the retardation produced is 25 centimetre per second square (cm/s2 )and the bus takes 20 seconds to stop. Calculate a)the initial velocity of bus b) the distance traveled by bus during this time Data given:Retardation (-a) = – 25 cm/s2 Time taken to get stopped (tav)=20 … Read more
Problem: A car travels a distance 100 metre with a constant acceleration and average velocity of 20 metre per second. The final velocity required by the car is 25 metre per second. Find 1) the initial velocity and 2) acceleration of car Data given:Distance(s) = 100 metreAcceleration(a) = ? ( to calculate)Average velocity(vav)=20 metre … Read more