Homework Statement
A physics book has a height of 26.0 cm, a width of 22.4 cm, and a thickness of 3.10 cm.
(a) What is the density of the physics book if it weighs 18 N?
? kg/m3
(b) Find the pressure that the physics book exerts on a desktop when the book lies face up.
? Pa
(c) Find the...
Homework Statement
An object weighs 285 N in the air. When tied to a string, connected to a balance, and immersed in water, it weighs 230 N. When it is immersed in oil, it weighs 261 N.
(a) Find the density of the object.
(b) Find the density of the oil.
Homework Equations...
Homework Statement
A charge of 2.9 nC and a charge of 5.8 nC are separated by 40.80 cm. Find the equilibrium position for a -5.0 nC charge.
? cm from the 2.9 nC charge.
Homework Equations
The Attempt at a Solution
F = 2.9/5.8NC/ 4(40.80)
Homework Statement
Homework Equations
Range = v0^2 sin(2 theta)/g
vy(tO=v0sin(theta) - gt
The Attempt at a Solution
a) the range equation is
Range = v0^2 sin(2 theta)/g
Range =1590^2sin(94)/9.8=247,341 m
there are several ways to find the time in the air...the vertical...
Homework Statement
http://i214.photobucket.com/albums/cc4/twinkie34005/untitled-10.jpg
http://i214.photobucket.com/albums/cc4/twinkie34005/untitled-11.jpg
Free fall problems, help please
Homework Equations
V = vi + a*t = .9+9.8*3.2 = 32.26 m/s
Y = vi*t + ½gt² = 53.056 m...
Homework Statement
A tennis ball is shot vertically upward in an evacuated chamber(neglect air resistance) with an initial speed of 20m/s at time t=0s.
How high does the ball rise?
A)98.0m
B)72.4m
C)20.4m
D)10.2m
E)40.8m
Approximately how long does it take the tennis ball to...