Questions from College Physics

Q: Two parallel plates are 4.0 cm apart. The bottom

Two parallel plates are 4.0 cm apart. The bottom plate is charged positively and the top plate is charged negatively, producing a uniform electric field of 5.0 × 104 N/C in the region between the plat...

Q: At an antique car rally, a Stanley Steamer automobile travels north

At an antique car rally, a Stanley Steamer automobile travels north at 40 km/h and a Pierce Arrow automobile travels east at 50 km/h. Relative to an observer riding in the Stanley Steamer, what are th...

Q: A lambda particle (Λ) decays at rest to a proton

A lambda particle (Λ) decays at rest to a proton and pion through the reaction Λ → p + π−. The rest energies of the particles are: Λ, 1115.7 MeV; p, 938.3 MeV; and π−, 139.6 MeV. Use conservation of e...

Q: Micah is standing on his frictionless skateboard facing a concrete wall.

Micah is standing on his frictionless skateboard facing a concrete wall. He wants to project himself backward by throwing small balls at the wall. His friend Jeremy says that Micah need not throw the...

Q: A force of 30 N is applied for 5 s to each

A force of 30 N is applied for 5 s to each of two objects of different masses. (a) Which one has the greater momentum change? (b) The greater velocity change? (c) The greater acceleration?

Q: If you take a rifle and saw off part of the barrel

If you take a rifle and saw off part of the barrel, the muzzle speed (the speed at which bullets emerge from the barrel) will be smaller. Why?

Q: Figure 17.31b shows a thundercloud before a lightning strike has

Figure 17.31b shows a thundercloud before a lightning strike has occurred. The bottom of the thundercloud and Earth's surface might be modeled as a charged parallel plate capacitor. The base of the cl...

Q: A firecracker at rest explodes, sending fragments off in all directions

A firecracker at rest explodes, sending fragments off in all directions. Initially the firecracker has zero momentum, but after the explosion the fragments flying off each have quite a lot of momentum...

Q: A plane weighing 220 kN (25 tons) lands on an

A plane weighing 220 kN (25 tons) lands on an aircraft carrier. The plane is moving horizontally at 67 m/s (150 mi/h) when its tailhook grabs hold of the arresting cables. The cables bring the plane t...

Q: The particle in a box model is often used to make rough

The particle in a box model is often used to make rough estimates of energy level spacings. Suppose that you have a proton confined to a one-dimensional box of length equal to a nuclear diameter (abou...