A train approaching a railway platform with a speed of 20 ms–1 starts blowing the whistle. Speed of sound in air is 340 ms–1. If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound to a person standing on the platform will appear to be A. 600 Hz B. 640 Hz C. 680 Hz D. 720 Hz

in a physics laboratory a block x is balanced by a block Y of mass 200 kg,each are suspended from a balance of equal lever arms .the scale pan on X is at a height.H1=2 cm ,where as scale pan on Y is at height 1 cm above the floor.the error in weighing is (in gram)

consider the figure of a single riveted lap joint as follows

My husband of 22 years dumped me and our two daughters for a lady he met on dating app, i was so confused, I didn’t know what to do at that moment, I
kept praying and believing he will return home, one day I told my friend at work what I was going through because I couldn’t bear the pain alone, that
was how she told me about DR mAHLANGU Traditional Home, i never believed her but something in me told me to give it a try, so i contacted him and he
told me the lady he is with now castled a spell on him, he said i should not worry, he said am going to receive a call from him in less than 24 hours,
on that faithful day i waited for his call till 12:00 NOON, my phone rang, guess who called, it was my husband Jonathan, he told me he did not know when or how he left me to italy, he said he was so sorry for every thing he made me go through, he told me he was coming back to me the following day, thats how i got my man back, if you want to contact this
great spell caster who helped me to bring back my husband in just 24 hours you should contact him with his  +27787390989,  

 

cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

 

 

Hello,

 

Can we learn and prepare for MHT-CET online ?