| 1 |
|
D is correct |
|
Since before two identical objects collided, they move along x-axis and collided which two of them are separated.
|
Conservation of momentum
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 2 |
|
A is correct |
|
S=ut +1/2 at*square
|
Linear motion
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 3 |
|
B is correct |
|
As calculated by basic forces
|
F(k)=u(k)N
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 4 |
|
A is correct |
|
Calculated follow the spring potential energy
=every stored in a stretched/compressed spring
|
E(sp)=1/2kx*square
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 5 |
|
D is correct |
|
Calculated form conservation of momentum
|
1/2mv square
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 6 |
|
A is correct |
|
Since another sphere has twice the radius so it is equal 2I
|
Geometry law
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 7 |
|
E is correct |
|
P=mv
|
Conservation of momentum
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 8 |
|
B is correct |
|
As calculated,it revealed number B
|
Energy law
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 9 |
|
E is correct |
|
It is crucial to have maximum speed on point Q since it could continue rolling.
|
Geometry & energy law
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 10 |
|
E is correct |
|
Since it could be possible that three of them may return to the space
|
Energy law
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 11 |
|
B is correct |
|
As calculated from solid and fluid equation.
|
Solid and fluid law
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 12 |
|
B is correct |
|
Calculated from conservation of energy
|
Kinetic energy law
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 13 |
|
B is correct |
|
Calculated from energy law
|
Energy law
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 14 |
|
|
|
|
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 15 |
|
|
|
|
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 16 |
|
|
|
|
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 17 |
|
|
|
|
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 18 |
|
B is correct |
|
The time is relatively closet to 120 s
|
Average speed law
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 19 |
|
A is correct |
|
Since delta k can be calculated by the sum of initial and final divided by 2
|
Collisions and explosions law
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|
| 20 |
|
E is correct |
|
Calculated from system of equations
|
System of linear equations
|
7 |
-.50
-.25
+.25
เต็ม
0
-35%
+30%
+35%
|