{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# Physics1 - Physics 140 Fall 2002 Midterm 3 1(P A bowling...

This preview shows pages 1–4. Sign up to view the full content.

Physics 140 Fall 2002 Midterm 3 1 1. (P) A bowling ball of diameter 26 cm is initially at rest at the top of a ramp inclined 37˚ above horizontal. You give it a gentle nudge, and it begins to roll without slipping down the ramp. At what distance along the ramp will the ball’s angular velocity reach 20 rad/s? a) 0.30 m b) 0.80 m c) 1.7 m d) 3.2 m e) depends on the mass of the bowling ball. 2. (P) You are reading a science fiction story that involves a 4.6x10 6 kg spaceship orbiting planet Xanadu, a planet with known escape velocity v esc =134 m/s. The ship’s engineer is asked to calculate the work needed from the ship’s engines to move the ship from a stable circular orbit of radius 2 r X to one of radius 6 r X . What is the correct answer to this question? a) 6.9x10 9 J b) 7.6x10 9 J c) 8.8x10 9 J d) 9.9x10 9 J e) 1.4x10 10 J

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Physics 140 Fall 2002 Midterm 3 2 3. (P) Two identical water bugs of mass m sit at rest on either end of a small stick of wood of mass 5 m and length L that floats in calm water. Bug 1 decides to leave and jumps off in a direction perpendicular to the stick, and just after the jump it is observed to have a horizontal velocity v relative to the water. What is the angular velocity of the stick+bug 2 system about its center of mass after bug 1 jumps? ( Hint: The stick floats freely in the water. How will the center-of-mass of the stick+bug 2 system react when bug 1 jumps off? ) a) (14/15)( v / L ) b) (17/19)( v / L ) c) (49/45)( v / L ) d) (18/15)( v / L ) e) (21/19)( v 2 / gL ) 4. In the figure below, multiple horizontal forces act on uniform rods that lie on frictionless ice. All angles are right angles and the central vector in cases A, B and E is located at the center of the rod. Considering the magnitudes of the forces to be variable (but non-zero), in which of the following situations would it be impossible for the rod to be in static equilibrium? A B C D E a) A b) B c) C d) D e) E
Physics 140 Fall 2002 Midterm 3 3 5. (P) A small video camera of mass m is suspended in static equilibrium in a corner as shown in the figure below. If the tension of the angled cord is twice that of the horizontal cord, | T 1 | = 2 | T 2

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 11

Physics1 - Physics 140 Fall 2002 Midterm 3 1(P A bowling...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online