Questions from College Physics

Q: Radon gas (Rn) is produced by the alpha decay of

Radon gas (Rn) is produced by the alpha decay of radium / . (a) How many neutrons and how many protons are present in the nucleus of the isotope of Rn produced by this decay? (b) The air in a studen...

Q: The string in a yo-yo is wound around an axle

The string in a yo-yo is wound around an axle of radius 0.500 cm. The yo-yo has both rotational and translational motion, like a rolling object, and has mass 0.200 kg and outer radius 2.00 cm. Startin...

Q: The natural abundance of deuterium in water is 0.0156%

The natural abundance of deuterium in water is 0.0156% (i.e., 0.0156% of the hydrogen nuclei in water are 2H). If the fusion reaction (2H + 2H) yields 3.65 MeV of energy on average, how much energy co...

Q: As shown in the top-view diagram, a 46.

As shown in the top-view diagram, a 46.4 N force is applied to the outer edge of a door of width 1.26 m in such a way that it acts (a) perpendicular to the door, (b) at an angle of 43.0° w...

Q: Hilda holds a gardening book of weight 10 N at a height

Hilda holds a gardening book of weight 10 N at a height of 1.0 m above her patio for 50 s. How much work does she do on the book during that 50 s?

Q: A uniform disk of mass 5.00 kg has a radius

A uniform disk of mass 5.00 kg has a radius of 0.100 m and spins with a frequency of 0.550 rev/s. What is its angular momentum?

Q: Suppose that a radioactive sample contains equal numbers of two radioactive nuclides

Suppose that a radioactive sample contains equal numbers of two radioactive nuclides A and B at t = 0. A has a half-life of 3.0 h, whereas B has a half-life of 12.0 h. Find the ratio of the decay rate...

Q: Can the velocity of an object be nonzero and the acceleration be

Can the velocity of an object be nonzero and the acceleration be zero at the same time? Explain.

Q: A gold wire and an aluminum wire have the same dimensions and

A gold wire and an aluminum wire have the same dimensions and carry the same current. The electron density (in electrons/cm3) in aluminum is three times larger than the density in gold. How do the dri...

Q: Assume Earth is a uniform solid sphere with radius of 6.

Assume Earth is a uniform solid sphere with radius of 6.37 × 106 m and mass of 5.97 × 1024 kg. Find the magnitude of the angular momentum of Earth due to rotation about its axis.