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THERMODYNAMICS
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THERMODYNAMICS
91 questions found
Practice Questions
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A plane flies at 100 m/s East while a crosswind blows at 100 m/s North. The plane’s resultant speed is approximately…
A.
200 m/s
✓
B.
0 m/s
✓
C.
141 m/s
✓
D.
100 m/s
✓
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Physics
Jun 25, 2026
A person pulls a box with a force of 50 N at an angle of 30° above the horizontal. The effective force pulling the box horizontally is…
A.
25.0 N
✓
B.
50.0 N
✓
C.
43.3 N
✓
D.
30.0 N
✓
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Physics
Jun 25, 2026
Two forces F1=20N at 45° and F2=20N at 135° act on a body. The resultant force vector is…
A.
40j N
✓
B.
28.3j N
✓
C.
20j N
✓
D.
20i N
✓
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Physics
Jun 25, 2026
If Rx = Rcosφ, then φ must be the angle between the vector R and the…
A.
y-axis
✓
B.
x-axis
✓
C.
z-axis
✓
D.
origin
✓
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Physics
Jun 25, 2026
A vector of magnitude 8 units lies in the 3rd quadrant, making an angle of 60° with the negative x-axis. Its components are approximately…
A.
(-4, -6.9)
✓
B.
(-6.9, -4)
✓
C.
(4, 6.9)
✓
D.
(-6.9, 4)
✓
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Physics
Jun 25, 2026
To nullify the vector A = (-4i – 6j), one must add the vector…
A.
(-4i - 6j)
✓
B.
(4i + 6j)
✓
C.
(4i - 6j)
✓
D.
(-4i + 6j)
✓
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Physics
Jun 25, 2026
A force of 10√2 N acts at an angle of 315°. Its components (Fx, Fy) are…
A.
(10 N, 10 N)
✓
B.
(-10 N, -10 N)
✓
C.
(10 N, -10 N)
✓
D.
(-10 N, 10 N)
✓
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Physics
Jun 25, 2026
The resultant of vector A=10 units at 270° and B=10 units at 180° has a magnitude of…
A.
0 units
✓
B.
10 units
✓
C.
20 units
✓
D.
14.1 units
✓
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Physics
Jun 25, 2026
The direction of the resultant vector from the previous question is…
A.
45°
✓
B.
135°
✓
C.
225°
✓
D.
315°
✓
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Physics
Jun 25, 2026
The resultant of three vectors of magnitude 3, 4, and 5 can be zero if they are arranged…
A.
along the sides of a right-angled triangle
✓
B.
along a straight line
✓
C.
in any random direction
✓
D.
It is not possible for the resultant to be zero
✓
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Physics
Jun 25, 2026
A force of 10 N acts at 30° and another force of 10 N acts at 150°. The resultant has a magnitude of…
A.
20 N
✓
B.
10 N
✓
C.
0 N
✓
D.
10√3 N
✓
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Physics
Jun 25, 2026
A force F has a magnitude of 40 N. Its component along an axis at 120° to it is…
A.
20 N
✓
B.
-20 N
✓
C.
34.6 N
✓
D.
-34.6 N
✓
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Physics
Jun 25, 2026
Three forces F1=(2i+3j), F2=(-4i+2j), F3=(2i-5j) act on a body. The body is in…
A.
equilibrium
✓
B.
uniform acceleration
✓
C.
non-uniform acceleration
✓
D.
rotational motion
✓
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Physics
Jun 25, 2026
The components of a vector are given by Vx = Vcosθ and Vy = Vsinθ. This is true only if θ is the angle the vector makes with the…
A.
positive x-axis
✓
B.
positive y-axis
✓
C.
negative x-axis
✓
D.
negative y-axis
✓
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Physics
Jun 25, 2026
A velocity vector has components (-30 m/s, +40 m/s). Its magnitude is…
A.
70 m/s
✓
B.
10 m/s
✓
C.
50 m/s
✓
D.
1200 m/s
✓
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Physics
Jun 25, 2026
The angle of the velocity vector from the previous question, with respect to the positive x-axis, is approximately…
A.
127°
✓
B.
143°
✓
C.
53°
✓
D.
37°
✓
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Physics
Jun 25, 2026
A boat moves with velocity (4i + 3j) m/s relative to the water, and the water moves with velocity (1i + 0j) m/s relative to the ground. The boat’s velocity relative to the ground is…
A.
(4i + 4j) m/s
✓
B.
(3i + 3j) m/s
✓
C.
(5i + 3j) m/s
✓
D.
(5i + 4j) m/s
✓
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Physics
Jun 25, 2026
If vector A = (6i – 8j), then the vector B = -A/2 is…
A.
(-3i + 4j)
✓
B.
(3i - 4j)
✓
C.
(-12i + 16j)
✓
D.
(12i - 16j)
✓
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Physics
Jun 25, 2026
A displacement vector D1 is 10 m North. A displacement vector D2 is 20 m at 30° East of North. The x-component of the resultant displacement is…
A.
10 m
✓
B.
17.3 m
✓
C.
20 m
✓
D.
30 m
✓
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Physics
Jun 25, 2026
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