Assignment 9 Problems(Fall Term Physics 102)
62. A uniform 10.0-N picture frame is supported as shown in Figure P8.62. Find the tension in the cords and the magnitude of the horizontal force at P that are required to hold the frame in the position shown.
Assignment 9 solutions (Fall term Physics 102)
8.62
Use an axis perpendicular to the page and passing through the lower left corner of the frame. Then, = 0 gives
T2
0.300 m
T1 sin50.0 T1 cos50.0
( 10.0 N )( 0.150 m ) ( T1 cos 50.0 )( 0.150 m ) + ( T1 sin
Assignment 10 Problems(Fall Term Physics 102) (Not to be handed in)
12. A grandfather clock is controlled by a swinging brass pendulum that is 1.3 m long at a temperature of 20C. (a) What is the length of the pendulum rod when the temperature drops to 0.0
Assignment 10 solutions (Fall term Physics 102) 10.12 (a) As the temperature drops by 20C, the length of the pendulum changes by
L = Li ( T )
1 = 19 106 ( C ) ( 1.3 m ) ( 20C ) = 4.9 104 m = 0.49 m m
Thus, the final length of the rod is L f = 1.3 m 0.49
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Assignment 6 Problems(Fa|l Term Physics 102)
2. A tennis player receives a shot with the ball(0.060 0
kg) traveling horizontally at 50.0 m/s and returns the
shot with the balltraveling hortontally at 40.0 m/s ii
the opposite direction. (a) W
[x
04.!)
57. A ball is thrown upward from the ground with an initial
speed of 25 m/s; at the same instant, a ball is dropped from
a building 15 m high. After how long will the balls be at the
same height?
T = 0f6 s."
62. A mountain climber stands at the t
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Assignment 5 Problems(Fall Term Physics 102)
\/ 13. A 70-kg base runner begins his slide into second
base when moving at a speed of 4.0 m/s. The coefcient
of friction between his clothes and Earth is 0.70. He
slides so that his speed is
Assignment 8 solutions (Fall term Physics 102) 8.8 If the mass of a hydrogen atom is 1.00 u (i.e., 1 unit), then the mass of the oxygen atom is 16.0 u.
x cg =
mi x i ( 16.0 u ) ( 0 ) + 2 ( 1.00 u ) ( 0.100 n m ) co s 53.0 = 6.69 103 n m = mi ( 16.0 + 1.00
Assignment 8 Problems(Fall Term Physics 102)
12. Consider the following mass distribution where the xy coordinates are given in meters: 5.0 kg at (0.0, 0.0) m, 3.0 kg at (0.0, 4.0) m, and 4.0 kg at (3.0, 0.0) m. Where should a fourth object of 8.0 kg be p
Assignment 7 solutions (Fall term Physics 102)
7.9
Main Rotor:
rev 2 r a d 1 m in v = r = ( 3.80 m ) 450 = 179 m s m in 1 r ev 60 s
m v v = 179 sound = 0.522 v sound s 343 m s
Tail Rotor:
rev 2 r a d 1 m in v = r = ( 0.510 m ) 4138 = 221 m s m in 1 r e
Assignment 1 solutions (Fall term Physics 102) 1.2 r, a, b, c and s all have units of L. So,
L L L = L2 = L s L The x distance out to the fly is 2.0 m and the y distance up to the fly is 1.0 m. Thus, we can use the Pythagorean theorem to find the distance
Assignment 2 Problems(Fall Term Physics 102)
57. A ball is thrown upward from the ground with an initial speed of 25 m/s; at the same instant, a ball is dropped from a building 15 m high. After how long will the balls be at the same height? T = 0.6 s 62.
Assignment 2 solutions (Fall term Physics 102)
2.57 The falling ball moves a distance of (15 m h) before they meet, where h is the
1 height above the ground where they meet. Apply y = v i t + at 2 , with a = g to 2 1 1 obtain (15 m h) = 0 gt 2 , or h = 15
Assignment 3 Problems(Fall Term Physics 102)
29. A brick is thrown upward from the top of a building at an angle of 25 to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 3.0 s, how tall is the building?
H=25 m
55. A home
Assignment 3 solutions (Fall term Physics 102)
3.29 We choose our origin at the initial position of the projectile. After 3.00 s, it is at ground level, so the vertical displacement is y = H .
1 To find H, we use y = v iy t + ay t 2 , which becomes 2 H =
Assignment 4 Problems(Fall Term Physics 102)
37. A 1000-N crate is being pushed across a level floor at a constant speed by a force F of 300 N at an angle of 20.0 below the horizontal as shown in Figure P4.37a. (a) What is the coefficient of kinetic frict
Assignment 4 solutions (Fall term Physics 102) 4.37 (a) Since the crate has constant velocity, ax = ay = 0 . Applying Newtons second law:
Fx = F cos 20.0 fk = max = 0 , or fk = ( 300 N ) cos 20.0 = 282 N
and Fy = n F sin 20.0 w = 0 , or
n = ( 300 N ) sin
Assignment 5 Problems(Fall Term Physics 102)
13. A 70-kg base runner begins his slide into second base when moving at a speed of 4.0 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he rea
Assignment 5 solutions (Fall term Physics 102) 5.13 (a) We use the work-energy theorem to find the work.
1 1 1 2 W = KE = mv 2 m v i2 = 0 ( 70 kg ) ( 4.0 m s ) = 5.6 102 J . 2 2 2
(b) W = ( F cos ) s = ( fk cos 180) s = ( k n ) s = ( k mg ) s ,
so
s=
5.6
Assignment 6 Problems(Fall Term Physics 102)
2. A tennis player receives a shot with the ball (0.060 0 kg) traveling horizontally at 50.0 m/s and returns the shot with the ball traveling horizontally at 40.0 m/s in the opposite direction. (a) What is the
Assignment 6 solutions (Fall term Physics 102) 6.2 Assume the initial direction of the ball in the x direction, away from the net.
(a)
Impu lse = p = m v f v i = ( 0.0600 kg ) 40.0 m s ( 50.0 m s ) giving Im pu lse = 5.40 kg m s = 5.40 N s toward the net.
Assignment 7 Problems(Fall Term Physics 102)
9. The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.60 m and 1.02 m, respectively. The respective rotational speeds are 450 rev/min and 4 138 rev/min. Calculate the speeds of t
Name: _ Date: _
1. Psychology is defined as the scientific study of:
A) conscious experience.
B) consciousness and the brain.
C) observable behavior.
D) mind and behavior.
2. _ believed that the mind was a blank slate.
A) Nativists
B) Philosophical empiri