PHYSICS 131 MIDTERM QUESTIONS AND ANSWERS
What happens to the scales when W1 hangs on a scale is lowered into a bucket of
water of W2 on a scale until it is fully submerged?
- W1 and W2 are unchanged
- W1 remains unchanged, W2 increases
- W1 decreases, W2 remains unchanged
- W1 decreases, W2 increases
- W1 and W2 decrease - Answers - W1 decreases and W2 increases
3 cubes have different volumes V1, V2, and V3 where V3>V1>V2. All of the cubes have
equal masses. What is the relationship between these densities?
- p1 = p2 = p3
- p1 < p2 < p3
- p3 < p1 < p2
- p2 < p1 < p3
- p1 = p2 < p3 - Answers - p2 < p1 < p3
3 identical cubes are placed on 3 surfaces S1, S2, and S3. S1 is completely flat, S2 is
at angle X, and S3 is at angle Y > X. On which surface is the pressure the largest?
- S1
- S2
- S3
- they are all equal
- Angles X and Y > X must be known in order to solve - Answers - S1
2 cubes of masses M1 and M2 and cross-sectional areas A1 and A2 are lying on a
smooth table. M2 of A2 is positioned on top of M1 of A1. The pressure exerted on the
table is:
- M1g/A1 + M2g/A2
- (M1+M2)g/A1
- (M1+M2)g/A2
- None of the above - Answers - (M1+M2)g/A1
3 blocks of wood with equal mass and volume are in different positions P1, P2, and P3
on a surface. In P1, A1 is touching the surface. In P2, A2 is touching the surface. In P3,
A3 is touching the surface. A1 < A2 < A3. Which position produces the greatest
pressure?
- P1
What happens to the scales when W1 hangs on a scale is lowered into a bucket of
water of W2 on a scale until it is fully submerged?
- W1 and W2 are unchanged
- W1 remains unchanged, W2 increases
- W1 decreases, W2 remains unchanged
- W1 decreases, W2 increases
- W1 and W2 decrease - Answers - W1 decreases and W2 increases
3 cubes have different volumes V1, V2, and V3 where V3>V1>V2. All of the cubes have
equal masses. What is the relationship between these densities?
- p1 = p2 = p3
- p1 < p2 < p3
- p3 < p1 < p2
- p2 < p1 < p3
- p1 = p2 < p3 - Answers - p2 < p1 < p3
3 identical cubes are placed on 3 surfaces S1, S2, and S3. S1 is completely flat, S2 is
at angle X, and S3 is at angle Y > X. On which surface is the pressure the largest?
- S1
- S2
- S3
- they are all equal
- Angles X and Y > X must be known in order to solve - Answers - S1
2 cubes of masses M1 and M2 and cross-sectional areas A1 and A2 are lying on a
smooth table. M2 of A2 is positioned on top of M1 of A1. The pressure exerted on the
table is:
- M1g/A1 + M2g/A2
- (M1+M2)g/A1
- (M1+M2)g/A2
- None of the above - Answers - (M1+M2)g/A1
3 blocks of wood with equal mass and volume are in different positions P1, P2, and P3
on a surface. In P1, A1 is touching the surface. In P2, A2 is touching the surface. In P3,
A3 is touching the surface. A1 < A2 < A3. Which position produces the greatest
pressure?
- P1
