NCERT Class 8

174. A particular star is at a distance of about 8.1 × 10^13 km from the Earth. Assuring that light travels at 3 × 10^8 m per second, find how long does light takes from that star to reach the Earth. 174. A particular star is at a distance of about 8.1 × 10^13 km [...]

172. Mass of Mars is 6.42 × 10^29 kg and mass of the Sun is 1.99 × 10^30 kg. What is the total mass? 172. Mass of Mars is 6.42 × 10^29 kg and mass of the Sun is 1.99 × 10^30 kg. What is the total mass? August 1, 2021 Category: Chapter 12 - [...]

167. Find three machines that can be replaced with hook-ups of (× 5) machines 167. Find three machines that can be replaced with hook-ups of (× 5) machines August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

166, Find a repeater machine that will do the same work as a (×1/8 ) machine. 166 Find a repeater machine that will do the same work as a (×1/8 ) machine. August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

165. Find two repeater machines that will do the same work as a (× 81) machine. 165. Find two repeater machines that will do the same work as a (× 81) machine. August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

164. If possible, find a hook-up of prime base number machine that will do the same work as the given stretching machine. Do not use (× 1) machines. 164. If possible find a hook-up of prime base number machine that will do the same work as the given stretching machine. Do not use (× 1) [...]

163. Supply the missing information for each diagram. 163. Supply the missing information for each diagram. August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

162. Neha needs to stretch some sticks to 25^2 times their original lengths, but her (×25) machine is broken. Find a hook-up of two repeater machines that will do the same work as a (×25^2) machine. To get started, think about the hookup you could use to replace the (×25) machine. 162. Neha needs to [...]

161. Shikha has an order from a golf course designer to put palm trees through a (× 2^3) machine and then through a (× 3^3) machine. She thinks she can do the job with a single repeater machine. What single repeater machine should she use? 144. Fill in the blanks August 1, 2021 Category: Chapter [...]

160. For each hook-up, determine whether there is a single repeater machine that will do the same work. If so, describe or draw it. 160. For each hook-up describe or draw it. determine whether there is a single repeater machine that will do the same work. If so August 1, 2021 Category: Chapter 12 - [...]