Chapter 5 Circular Motion
221. Centripetal force is also called Seeking force
222. Moment of inertia or rotational inertia(I) is equal to mr2
223. In absence of external torque the angular momentum of system remains Constant
224. The minimum required velocity to put a satellite into the orbit is called Critical velocity (7.9 km-1)
225. The speed of satellite is inversely proportional to its Radius
226. The time which is taken by geostationary satellite or geosynchronous to complete round around the earth is 24 hours
227. The geostationary orbit has an altitude of 22,240 miles (35,790 km)
228. The geostationary orbit has an speed of 6,880 mph (11,070 kmh-1)
229. The radius of geostationary satellite from center of the earth is 4.23 x 104 km
230. The radius of the earth is 6.4 x 106 m
231. A body weight in upward moving lift Increases
232. A body weight in lift at rest is Constant
233. A body weight in downward moving lift Decreases
234. In absence of an external torque, the angular momentum of rotating body is constant
235. The dimension of angular acceleration is [T-2 ]
236. Motion of the bob of the simple pendulum is slowest at the Equator of earth
237. If the coplanar forces acting on the body keep it in the equilibrium then these forces are Concurrent
238. The angle between linear and angular velocity is 900
239. If the area of the circle is equal to its circumstance , the radius of the circle is 1
240. A body weight in freely falling lift is Zero
241. When satellite is falling freely everything in this appears to be Weightless
242. Momentum is conserved providing no external force act Principle of conservation of momentum
243. A body in equilibrium must have not Acceleration
244. The escape velocity from the earth gravitational field depends on Radius of earth and g
245. The geostationary satellites are rotating with the speed of Earth
246. The magnitude of periodic force, which the simple pendulum exert on the suspension point depends on Value of g
247. Angular acceleration is produced by Torque
248. The escape velocity of any mass from earth is 11x 103 m s-1 Or 11km s-1
249. The escape velocity from any planet depends on radius and mass of that Planet
250. The gravitational potential energy per unit mass is called Gravitational potential
251. The orbital velocity of satellite in an orbit around the earth depends upon Radius of the orbit
252. The value of G at the moon as compared to earth is Smaller (one sixth)
253. The time period of communication satellite is 24 hour
254. The displacement of a body in circle is called Angular displacement
255. 1rev= 2π radian
256. 1 radian = 57.30
257. Longitude of the place does not affect the value of G
258. The value of g is affected by the Latitude of place
259. The value of g is affected by the Depth of place
260. The value of g is affected by the Attitude of place
261. SI unit of angular displacement is Radian
262. SI unit of angular velocity is Radian/sec
263. The direction of angular velocity of a body moving in a circle is Along the tangent
265. The direction of angular velocity is given by Right hand rule
266. The rate of change of angular velocity is called Angular acceleration
267. SI unit of angular acceleration Rad sec-2
268. The dimension of angular acceleration are [T-2]
269. The relation between linear and angular acceleration are a = r α
270. The vectorical form of angular acceleration is -ω2 r
271. The force headed to keep to keep the body in acceleration is called Centripetal force
273. Angular momentum is conserved under Central force
274. When the body is moving with uniform acceleration in circle, here constant is Magnitude
275. The direction of body moving with uniform acceleration is Variable
276. K.E and angular momentum of a body is related by K.E = ½ Lω
278. The moment of inertia of body depends upon mass and Distribution with respect to axis of rotation (I=mr0)
279. Centripetal acceleration is always directed towards the Center of circle
280. In a gymnast rotating on rotating stool with his stretched arms, he lowers his arms. The angular speed will Increase (L=Iω)
281. Centripetal force performs Zero work (d=0)
282. When body is whirled in vertical circle at the end of the string tension in the string is maximum At the bottom (T=Fc + w)
284. The angular speed for daily rotation of earth in rad s-2 is 7.5 x 10-5
285. When external force acting on a system is constant, angular momentum is Conserved
286. When the body moves in circular path, its velocity remains Changes continuously
288. The dimension of moment of inertia [ML-2]
289. The law of gravitation was introduced by Newton
290. According to Einstein’s theory space time is Curved