A 25-kg television set rests on four rubber pads that are on the floor, each one having a height of 1.0 cm and a radius of 0.60 cm. A horizontal force is applied to the television set
When the pads are just at the point of sliding over the floor, how far has the television set moved sideways due to the deformation of the pads? The coefficient of static friction between the rubber and the floor is 1.0 and the shear modulus of these rubber pads is 2.6 × 106 Pa.
A) 4.2 mm B) 16 mm C) 2.1 mm D) 8.4 mm E) 1.1 mm
C
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Energy and Momentum: In a certain nuclear reactor, neutrons suddenly collide with deuterons, which have twice the mass of neutrons. In a head-on elastic collision with a stationary deuteron, what fraction of the initial kinetic energy of a neutron is transferred to the deuteron?
A. 1/2 B. 1/3 C. 3/4 D. 5/6 E. 8/9
A car drives over a hilltop that has a radius of curvature 0.120 km at the top of the hill. At what speed would the car be traveling when it tires just barely lose contact with the road when the car is at the top of the hill?
A) 45.5 m/s B) 41.8 m/s C) 34.3 m/s D) 22.2 m/s E) 27.6 m/s
A proton has a speed of 3.0 × 106 m/s in a direction perpendicular to a uniform magnetic field, and the proton moves in a circle of radius 0.20 m. What is the magnitude of the magnetic field?
A) 0.040 T B) 0.080 T C) 0.16 T D) 0.24 T E) 0.32 T
A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, its frequency:
1.increases. 2.decreases. 3.stays constant.