题干

将一钢球放入盛有100mL水的量筒中,水面上升到150mL处.又用天平称出该球质量为237g.(ρ=7.9×l03kg/m3 ρ煤油=0.8×l03kg/m3

求(1)此钢球是空心的还是实心的?

(2)若为空心的,空心部分体积是多少?

(3)在空心部分注满煤油,那么钢球的总质量为多少?

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答案(点此获取答案解析)

解:(1)V=150ml﹣100ml=50ml=50cm3;ρ=7.9×103kg/m3=7.9g/cm3
由ρ=
m
v
得钢球钢的体积(实心体积)
V

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     Deputy (副职) Head Teacher Wanted

     Position:Deputy head teacher

     Employer:Bracknell Forest Council

     Published:10∶00 A.M.Mon.Dec.12,2011

     Closing date:10∶00 A.M.Mon.Jan.16,2012

     Working pattern:Full­time

     Salary:£20,000-£34,999 per year

     Location:Jennett’s Park Primary School,Bracknell,Berkshire

    The governors are seeking to employ an enthusiastic deputy head teacher to be a key partner in founding and leading our brand­new primary school in Bracknell.

     We offer:

    ●a brand­new school building

    ● the opportunity to work in close partnership with the head teacher and governors to create and develop a new staff team

    ●a growing community looking forward to their new school opening

    ●the opportunity for further professional development which will support you through the next stage of your career

    ●the opportunity to lead key projects across the school

    You will be:

    ●an excellent classroom practitioner (从业人员),who will enjoy shaping and delivering a broad,balanced and creative curriculum in class

    ●able to lead the staff by focusing on teamwork

    ●committed to working in partnership with parents and the nearby community

    For further information,you can contact the head teacher,Ms Maria Soulsby,by dialing 32899918 or you can send an email to mariasoulsby @bracknell­forest.gov.uk. You can also come to visit our school in person.

     If you have not heard from us two weeks after the closing date,that means your application has not been accepted.Apply using Bracknell Forest Council application forms only;CVs (简历) will not be accepted.

    This school is committed to safeguarding and promoting the welfare of children and expects all staff to share this commitment.

    All staff employed in the school must be aware that a check on the criminal record will be done.