问题 问答题

旅顺老铁山下有丰富的温泉资源,测量老铁山温泉水的密度,提供以下器材:A、温泉水样品;B、天平和砝码;C、弹簧测力计;D、量筒;E、烧杯;F、刻度尺;G、小铝块和细线;H、带提手的水桶;I、水.回答以下问题:

(1)所选用的器材(只需选择出器材前面的字母)______

(2)所测量的物理量(用文字和字母表示)______

(3)温泉水密度的最终表达式______.

答案

测量方法有多种.

方法一:

(1)选取器材为:A、温泉水样品;B、天平和砝码;D、量筒;E、烧杯;

实验步骤:在烧杯内倒入适量的温泉水,用天平测出烧杯和温泉水的总质量m1;将烧杯中的部分温泉水倒入量筒中,读出量筒内温泉水的体积V;利用天平测出烧杯和剩余水的质量m2,利用密度公式算出温泉水的密度ρ

(2)需要测量的物理量:烧杯和温泉水的总质量m1,烧杯和剩余水的质量m2,温泉水的体积V.

(3)温泉水密度表达式ρ=

m1-m2
V

方法二:

(1)选取器材为:A、温泉水样品;C、弹簧测力计;D、量筒;H、带提手的水桶;

实验步骤:在水桶内倒入适量的温泉水,用弹簧测力计测出水桶和温泉水的总重G1;将水桶中的部分温泉水倒入量筒中,读出量筒内温泉水的体积V;利用弹簧测力计测出水桶和剩余水的重力G2,利用密度公式算出温泉水的密度ρ

(2)需要测量的物理量:水桶和温泉水的总重G1,水桶和剩余水的重力G2,温泉水的体积V.

(3)温泉水密度表达式ρ=

G1-G2
Vg

其它设计合理均可.

填空题 案例分析题
单项选择题

Are teens and young adults more narcissistic (自恋的) today than in the past That’s the view of a California researcher who studies (1) people.

In her new book, The Narcissism (2) : Living in the Age of Entitlement, psychologist Jean Twenge of San Diego State University and (3) W. Keith Campbell of the University of Georgia say research shows (4) young people today have "narcissistic traits" than in (5) generations. Such traits, Twenge says, include a very. (6) and inflated sense of self, which is (7) by a preoccupation with MySpace, Facebook and YouTube.

"We’ve been on this self-admiration cultural (8) for a long time," Twenge says. (9) Twenge’s take on today’s young people isn’t universal. Studies by other researchers, including Canadian (10) Dr. Kali of the University of Western Ontario, have used the same data but found (11) results. "They put a different (12) on it," Kali says.

Twenge’s studies have found more narcissistic traits and a (13) rate of increase among college students today, but Kali found that students’ narcissism was (14) greater in 2006 than in 1976. Twenge’s most recent paper studied the same data as Kali--more than 20 000 college students from 2002 to 2007. (15) researchers used the Narcissistic Personality Inventory to measure narcissistic (16) and findings by both have been (17) in peerreviewed journals.

Twenge’s book (18) just a month after The Mirror Effect : How Celebrity Narcissism Is Seducing America, a book co-written by behavioral (19) Drew Pinsky, (20) suggested that a celebrity-obsessed culture is causing more narcissism.

11()

A.similar

B.different

C.strange

D.odd