Physics Prelim 2 Lecture Questions

(a) B

(b) C

(c) C

(a) A

(b) B

(c) C

(d) D

(a) A

(b) C

(c) C

(d) B

(e) B

(a) C

(b) E

(c) D

Up to Circle Motion dynamics

Date: feb 21

• The wheel's angular speed

• The tangential linear speed of a point on the wheel's rim

• The radial acceleration of a point on the wheel's rim

The rotation speed must decrease

both are positive and equal to each other

Total momentum after = total momentum before

Total KE after = ½ x total KE before

The yellow block

2mv²

0

The iceboat of mass 2m:  it has sqrt(2) times as much momentum as the other

The horizontal component of total momentum of the box and cart

equal to the magnitude of the momentum of block B

3 times the kinetic energy of block B

2mv

mv

sqrt(5) v

1,3,5

mv (dv/dt)

mgv x sin(theta)

x=b

x=a

x=b, x=d

x=b

U has a local maximum at x = a

the normal force on the rock acts perpendicular to the bowl's surface.

The static friction force on the car due to the road

The normal force on the car due to the road

When an airplane turns by banking, which force makes the plane turn in a curved path?

The lift force on the plane due to the air

downeast (downright)

Up

TRUE or FALSE?:  The moment of inertia of an object can be calculated by assuming that all its mass is concentrated at its center-of-mass.

False

Thin-walled hollow cylinder

 

Apparatus B

Apparatus B

Two hollow cylinders have the same inner and outer diameters and the same mass, but they have different lengths because one is made of low density wood and the other of high density brass.

Which cylinder has the greater moment of inertia about its cylindrical center axis?

The wood one

The brass one

Both have the same moment of inertia

CANNOT tell from the information given

Both have the same moment of inertia

TRUE or FALSE?:  The total gravitational potential energy of an object can be calculated by assuming that all its mass is concentrated at its center-of-mass.

True

Block's acceleration equals the tangential acceleration of the cylinder's outer surface.

Block's speed equals the tangential speed of the cylinder's outer surface.

TRUE or FALSE?:  Of all the possible axes that are parallel to a given direction in space, the axis that gives the smallest value for a body's moment of inertia is the one through the body's center-of-mass.

True