An analyst has gathered the following information about a company:

A．Balance Sheet

B．Assets

C．

D．Cash

E．100

F．Accounts Receivable

G．750

H．Marketable Securities

I．300

J．Inventory

K．850

L．Property, Plant ＆ Equip

M．900

N．Accumulated Depreciation

O．(150)

P．Total Assets

Q．2750

R．

S．

T．Liabilities and Equity

U．Accounts Payable

V．300

W．Short-Term Debt

X．130

Y．Long-Term Debt

Z．700

Z．Common Stock

Z．1000

Z．Retained Earnings

Z．620

Z．Total Liab. and Stockholder’ s equity

Z．2750

Z．

Z．

Z．Income Statement

Z．Sales

Z．1500

Z．COGS

Z．1100

Z．Gross Profit

Z．400

Z．SG＆A

Z．150

Z．Operating Profit

Z．250

Z．Interest Expense

Z．25

Z．Taxes

Z．75

Z．Net Income

Z．150

仔细观察下 * * 个实验，并回答：

图1实验说明发声的物体在_________；图2实验表明静止的砝码具有_________；图3实验说明力可以改变物体的____________。