ENGR 2100Quiz #5
A compressive stress of 10,000 psi is applied to the end of a steel rod. What
change in ambient temperature is needed to ensure that the rod maintains its
original length, L? (E = 30(
ENGR 2100-Quiz #6
A circular shaft with d = 2 in and L = 20 in is twisted in a testing
machine until one end rotates through an angle of 0.6 with respect
to the other end. For this angle of twist the
ENGR 2100Quiz #4
A steel block weighing 100 N rests on a surface that is capable of being raised
and lowered. If the coefficient of static friction, s, between the block and the
surface is 0.4, at wha
ENGR 2100Quiz #3
A section of a large truss is shown below, find the forces F1, F2, and F3.
1 kN
K
F1
60
= . kN (T)
F2
2L
= 0 = 2() + 1.732 3
= 0 = 1 + 2 2 sin 60
= . kN (T)
A
L
2 kN
B
F3
= 0 = 1
ENGR 2100-Quiz #8
Yoda, the Jedi Master, is riding on a rolling wheel having
radius 1 m. If the angular velocity of the wheel is 3.5 rad/s
anticlockwise and is constant, find Yodas absolute
accelerati
ENGR 2100Quiz #7
#13 Kasey Cooper can smash the daylights
out of a softball. If the 0.4 lb softball comes
in horizontally with a velocity of 88 ft/sec
and leaves Kaseys bat with a velocity of 110
ft/s
ENGR 2100Quiz #2
A 50 kg flowerpot is suspended from wires AB and BC as shown. Calculate the
tension in each wire.
TBC
Free Body Diagram: T
AB
30
45
50 kg (491 N)
+ = 0 = cos 45 cos 30 = 1.2247
+ = 0
ENGR 2100Quiz #1
A square plate is subjected to an applied force of 200 lb at Point O and an
applied couple of 100 lbft at Point A. Find the resultant moment at Point B.
B
1 ft
O
1 ft
A
100 lbft
200 l
ENGR 2100Quiz #1
Replace the 10 kN (10,000 N) force with an equivalent force F and moment M
(both vectors) acting at point O.
10 kN
y
0.25 m
x
1m
O
F = 10 kN or 10 kN
M =2.5 kNm or 2.5 kNm
ENGR 2100-Quiz #3
Determine the force and if it is in tension or compression in member CD of the truss below. All
triangles are equilateral with side length L meters and the support forces at A and D
ENGR 2100Quiz #2
A horizontal bar is loaded as shown below. Find the support reactions (forces,
moment) provided by the wall. Neglect the weight of the bar.
1000 lb
15 ft
30
Drawing the FBD
1000 lb
Wx
ENGR 2100Quiz #4
Herakless strength allows him to pull a maximum 5000 lb. If he is asked to
pull a heavy stone up a 15 slope, find the maximum weight W of the stone if
the coefficient of friction betw
ENGR 2100Quiz #8
Find the maximum normal stress, max, on the T shaped beam below if
Mmax = 300 lbft. The moment of inertia about the neutral axis (N.A.) is 3.617 in4.
3 in
1 in
1.10 in
N.A.
2 in
1 in
ENGR 2100Quiz #10
At the Great Pumpkin Sling Festival, at the Picatinny Arsenal, a trebuchet (a kind
of catapult) is used to throw pumpkins across a field. If a 2 lb pumpkin is hurled at
an initial ve
ENGR 2100Quiz #7
For the simply supported beam shown below, draw the shear force and bending
moment diagrams and find the value and location of Vmax and Mmax.
500 lb
500 lb
3 ft
3 ft
3 ft
500
Vmax = 5
ENGR 2100Quiz #9
For the stress state shown below, what rotation angle is required in order for the
shear stress to disappear?
x = 500 MPa
y = -200 MPa
xy = 150 MPa
This will occur for the principle s
ENGR 2100Quiz #6
A Formula SAE car with a mass of 25 slugs encounters a hump which has a
radius of curvature = 300 ft. What is the minimum speed (ft/sec) vB that will
cause the car to lose contact wit
ENGR 2100Quiz #5
#13 Kasey Cooper (3B) can smash the daylights
out of a softball. If the softball leaves Kaseys bat
with an initial velocity of 88 ft/sec at an angle with
the horizontal of 30, neglect
ENGR 2100Quiz #4
Find the maximum value of the mass m0 before the 20 slug mass begins to
move up the plane. Assume the pulley is frictionless and s = 0.30.
m0
20
FBD
y
m og
x
0.3 N
20 slug = m
N
Fy =
ENGR 2100
Quiz #7
A pendulum 2 m in length is lightly nudged from rest from the vertical
position ( = 0) as shown. If the bob at the end of the pendulum has a mass of
2 kg, determine the load (L) carr
ENGR 2100Quiz #9
The block shown below is accelerating to the right on a frictionless surface. A
rod 3 m in length having a mass of 3 kg hangs from a frictionless pin at point
O, and makes an angle of
ENGR 2100Quiz #3
Find the forces in members AD and BD. Indicate whether these
members are in tension (T) or compression (C).
1000 lb
D
cut
3 ft
A
C
3 ft
3 ft
B
SOLUTION:
From symmetry Ay = Cy = 500 lb
ENGR 2100Quiz #6
A 640 kg Formula 1 car encounters a hump which has a circular shape and a
radius = 300 m. What speed vB will cause the car to lose contact with the
road at the topmost point?
vB
300 m
ENGR 2100
Quiz#2
Find the tension in the wires
AB and BC if the mass of the
flowerpot is 50 kg.
FBC
FAB
30
45
50(9.81) N
+ = 0;
+ = 0;
cos 45 cos 30 = 0
sin 30 + sin 45 50(9.81) = 0
Solving:
= 359.
ENGR 2100-Quiz #8
Yoda, the Jedi Master, is riding on a rolling wheel having radius 1 ft. If the
angular velocity of the wheel is 2 rad/s anticlockwise and the angular
acceleration is 1.0 rad/s2 clock
ENGR 2100Quiz #1
For the structure below, replace the two forces and the
couple with a resultant force R and a moment M at point O.
y
3 ft
275 lb
1000 lb-ft
x
O
5.5 ft
500 lb
SOLUTION
= 275 + 500 = 2