Five objects of mass m move at velocity

 at a distance r from an axis of rotation perpendicular to the page through point A, as shown below. The one that has zero angular momentum about that axis is

a.


b.


c.


d.


e.

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d

Physics & Space Science

A cyclotron is designed to accelerate protons (mass 1.67 x 10-27 kg) up to a kinetic energy of 2.5 x 10-13 J. If the radius of the dipole magnets is 96 cm, what is the magnetic field used in the cyclotron?

A. 35 mT B. 0.13 T C. 0.19 T D. 0.21 T

For an infinite solid slab subjected to convective heat transfer, show that Equation 10-68 follows from Equation 10-67.

A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?

a. ?0.64 kJ b. ?0.40 kJ c. ?0.52 kJ d. ?0.28 kJ e. ?0.76 kJ

A U-tube is open to the atmosphere at both ends. Water is poured into the tube until the water rises part-way along the straight sides, and then some oil with a density of 920 kg/m3 is poured into one end

This causes the water surface on that side of the tube to go down by 5.50 mm, and the surface on the other side to go up by the same amount. How much higher is the top surface of the oil on that side of the tube compared with the surface of the water on the other side of the tube? A) 0.96 mm B) 1.2 mm C) 0.44 mm D) 1.2 cm E) 1.1 cm