một mặt phẳng vô hạn điện tích đều , mật độ điện tích mặt bằng 4 nhân 10^-9 C/cm2 đặt thẳng đứng trong không khí , có khối lượng 8g , q=10^-8 C treo gần mặt phẳng , sao cho dây treo lúc đầu song song với mặt phẳng . Lấy g=9,8m/s2 . Khi cân bằng , dây treo quả cầu hợp với mặt phẳng một góc bằng bao nhiêu ?

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

confused

confused             hewdejdnjnjsnd

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.