如图所示,光滑斜面与水平面在B点平滑连接,质量为0.20kg的物体从斜面上的A点

题型:计算题

问题:

如图所示,光滑斜面与水平面在B点平滑连接,质量为0.20kg的物体从斜面上的A点由静止开始下滑,经过B点后进入水平面(设经过B点前后速度大小不变),最后停在水平面上的C点。每隔0.20s通过速度传感器测量物体的瞬时速度,下表给出了部分测量数据。取g=10m/s2

t/s0.00.20.41.21.4
v/m•s-10.01.02.01.10.7
求:

(1)斜面与水平面的夹角;30°

(2)物体与斜面间的动摩擦因数;0.2

(3)t=0.8时物体的瞬时速度。1.9m/s

考点:匀变速直线运动
题型:计算题

Enjoy free re-admission for a year if you buy your ticket directly from us. Tickets purchased directly from the Royal Collection can be transformed into a 1-Year Pass, giving 12 months’ free admission to Windsor Castle. This pass is valid for a year from the date of your first visit.

How do I transform my ticket into a 1-Year Pass?

1. Before you leave the site, please sign and print your name in the spaces provided on the back of your ticket.

2. Hand the ticket to a member of staff, who will stamp and validate(使…生效) it.

3. Keep your ticket for future visits.

Your ticket will only be accepted for re-admission if it has been stamped on the day of your first visit.

Subsequent(随后的) visits

To gain admission on subsequent visits, your signed and stamped original ticket (now your 1-Year Pass) must be produced on arrival at the ticket counter. You will also be required to provide proof(证据) of signature, such as a passport, driving licence, or credit card. You will then be given a gift ticket for admission on that day. Children under the age of 18 are not required to show proof of signature.

Alternatively, to guarantee admission you may pre-book your subsequent visits by telephoning the Ticket Sales and Information Office, +44 (0)20 7766 7334. A booking fee applies. Pre-booked tickets will not be posted to you, but can be collected from the ticket counter on the day of your visit on production of your signed and stamped 1-Year Pass and proof of signature.

The benefits of the 1-Year Pass are not transferable, and your ticket may not under any circumstances be given to another person or re-sold. Any attempted use of the ticket by another party to gain admission automatically cause the ticket invalid.

Free re-admission is always subject to ticket availability and may be unavailable on up to 5 days each year when the site is open to the public. It is not possible to use your 1-Year Pass when the site is closed. Before planning a visit please see the Visit Pages on www.royalcollection.org.uk to check if any dates are excluded and to confirm admission details.

Dates when 1-Year Pass free re-admission is unavailable in 2012:

Saturday 7 April 2012

Sunday 8 April 2012

Monday 9 April 2012

Monday 7 May 2012

Monday 4 June 2012

Please note that gift tickets and tickets booked through a tour operator or ticket agent cannot be transformed into a 1-Year Pass.

Ticket Sales and Information Office

Official Residences of The Queen

London SW1A 1AA

www.royalcollection.org.uk

Telephone +44 (0)20 7766 7334

小题1:Which of the following tickets can be transformed into a 1-Year Pass?

A.gift tickets

B.tickets bought from Royal Collection

C.tickets booked from a tour operator

D.tickets bought from an agent小题2:If you want to have a 1-Year Pass to Windsor Castle, you DON’T have to ______.

A.get your ticket stamped

B.sign your name

C.buy a ticket

D.show your proof of signature小题3:If you transformed your ticket to a 1-Year Pass on 15 March, 2012, you could use it on ______.

A.9 April 2012

B.4 June 2012

C.10 March 2013

D.15 April 2013小题4:To book a further admission with a 1-Year Pass, ______.

A.you need to pay some money

B.you can ask your friend to lend you his 1-Year Pass

C.you can have your gift ticket delivered to you

D.you need to show your passport and credit card on your arrival

题型:计算题

热加工过程,实际上是加工硬化和再结晶这两个重叠的过程。

题型:计算题

“二次弹片”是指()

A.外伤时异物进入组织内

B.被打折或脱位的牙

C.牙齿上的牙结石

D.再次受到弹片的打击

E.游离的软组织

题型:计算题

以下哪个不是课程计划的基本部分()

A.教学科目

B.学科开设的顺序

C.规划某门学科的内容

D.各门学科的教学时数

题型:计算题

根据《防暑降温措施管理办法》(安监总安健[2012]89号)第六条规定:用人单位应当根据国家有关规定,合理布局生产现场,改进生产工艺和操作流程,采用()保证工作场所符合国家职业卫生标准要求。

A.良好的隔热

B.空调

C.降温措施

D.通风

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