Physics Problem Set (University Physics with Modern Physics 15th Edition By Hugh D. Young)

PROBLEM SET 4




W=FdcOsO a)
U mgy
=




c) WU UF-Ui
a) F'=FCOS25.80 <F => smaller
=




b.)

=(35N)(50m) (Os 25° =(0.20kq) (9.8m/s) (1.3m) =(-9.85) -(2.55)

1586.045
=
W:W 1.59x1035
c)
=
=) the same :
2.55J =-
12.35



1.59x105
=




b.) U=mgy



=(0.2kg) (9.8 mis)) 5.0m) -




= -

9.85




a) (3N)(3m)
(3N)
w 2.) W =
(5m) 7.305
=

7.505
=
=




2
a)
WI: SFxax wr= S cax+4) axx m




b.)
W (3N) (5m) 15.0 J
=
=
d.) (7.30 +

7.30 15.0)5=30.05
+
Fx (2x 4)N
=
+

=x
4a),N
+
m




xi 1m (5 4)5
=



20 1
+
= - -




X ==5m =40.05




b)
WV =
Wint 40.0J
-

=-




2.) OK k F
=
-
mv2
I


a) k1 (0.6kg)(2.0m/s)2
=


SW=WK
C) KB
=
-
*
A
kF 4k
=
+
mr
I (2.45)
=

:
Im(V v)
-
=405 +
I (3k9)(3mis)

1.25
=

=
10.649) (SmIs" -2m/s) 405
=



t(3ka)(9m2s)
+




b.) k =

mv2 =0.3k9 (25m"Is -
4m2/32) 405
=




(4557
+




=

v2 =0.3kg(21m"/32)
=(0.6kg)
7.505 = 405 22.55
=
+




7. 505 0.3kg v =6.305 62.55
=
=




=
v 25m/s


v 5mIS
=