High-speed stroboscopic photographs show that the head of a golf club of mass 200 grams is traveling at 55.0 m/s just before it strikes a 46.0-gram golf ball at rest on a tee. After the collision, the clubhead travels (in the same direction) at 40.0 m/s. Find the speed of the golf ball just after impact.
What will be an ideal response?
65.2 m/s
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Collisions in Two Dimensions: Two dogs, Rover and Fido, run on a level frictionless surface. Rover runs eastward with a momentum of 24 kg . m/s, and Fido runs northward with momentum 10 kg . m/s. They make a sudden perfectly inelastic collision. What is the magnitude of their combined momentum after the collision?
A. 14 kg . m/s B. 26 kg . m/s C. 34 kg . m/s D. It cannot be determined without knowing the masses and velocities of the dogs.
The density of a solid object is defined as the ratio of the mass of the object to its volume. The dimension of density is
A) [M]/[L]. B) [L]3/[M]. C) [M] [L]-3. D) [M][L][T]. E) [M][L].
The element iron, having atomic number 26, is the "crossover point" between fusion and fission. Why?
A) Because all elements heavier than iron are radioactive, implying that they will fission easier than they will fuse. B) Because of the neutron balance that results from splitting a nucleus. C) Because for elements lighter than iron, fusion converts nuclear energy to non-nuclear energy, whereas for elements heavier than iron, fission converts nuclear energy to non-nuclear energy. D) Because neutrons will only split the elements that are heavier than iron. E) Because for elements lighter than iron, fusion converts non-nuclear energy to nuclear energy, whereas for elements heavier than iron, fission converts non-nuclear energy to nuclear energy.
A charged particle with mass m is suspended in the air by an upward-directed electric field E. What is the charge on the dust particle?
a. q = mgE b. q = mg/E c. q = E/mg d. q = Em/g