题目内容
【题目】一物体在运动过程中，重力做了－2 J的功，合力做了4 J的功，则（ ）
A．该物体动能减少，减少量等于4 J
B．该物体动能增加，增加量等于4 J
C．该物体重力势能减少，减少量等于2 J
D．该物体重力势能增加，增加量等于2 J
【答案】BD
【解析】重力做负功，重力势能增加，增加量等于克服重力做的功，选项C错误，选项D正确；根据动能定理得该物体动能增加，增加量为4 J，选项A错误，选项B正确．
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【题目】【2015·福建】C
SIGN YOUR CHILD UP FOR "FLY TO THE MOON CLUB"
AND ENJOY A FREE * FLIGHT TO ANY DESTINATION IN ASIA!
With a registration fee of just $50 per child, children under the age of 12 can join Eagle Airways'FLY TO THE MOON CLUB as members.
They can then enjoy the same benefits onboard Eagle Airways' newest Boeing-797 to any destination in the world!
BENEFITS YOU CAN'T MISS!
A free * flight to any destination in Asia
30% off any course at Tanya Language School
20% off any purchase made at Ruby Bookstore
A free notebook with every purchase above $50 at Starlight Stationery
A free bowl of dessert for a family of four at Don's Diners dinner ordered
A birthday gift on your child's birthday
A free album containing pictures taken during the journey
All bookings made before 12 September will receive free travel insurance for the entire family! ** Insurance is issued by Live Life Insurance Group.10% OFF ALL BOOKINGS for departures from 5 to 11 September
* Child must be accompanied by two paying adults.
** Terms and conditions apply.
【1】One of the benefits mentioned in, the advertisement is .
A.a free flight to any destination in the world
B.30% off any book purchased at Ruby Bookstore
C.a free bowl of dessert at any restaurant at the airport
D.a discount on any course at Tanya Language School
【2】Which of the following bookings may receive the most benefits?
A.
Booking date | Departure date |
September 13 | September 18 |
B．
Booking date | Departure date |
September 2 | September 12 |
C.
Booking date | Departure date |
August 15 | September 4 |
D.
Booking date | Departure date |
August 16 | September 8 |
【3】Which of the following is TRUE according to the advertisement?
A.You need to pay$50 to sign up a child for the club.
B.Club members enjoy free travel insurance for any flight.
C.The advertisement is intended for students of all ages.
D.Any child must be accompanicd by at least one paying adult.
