Questions from College Physics

Q: A spherical conductor with a radius of 75.0 cm has

A spherical conductor with a radius of 75.0 cm has an electric field of magnitude 8.40 × 105 V/m just outside its surface. What is the electric potential just outside the surface, assuming the potenti...

Q: Electrons in a cathode ray tube start from rest and are accelerated

Electrons in a cathode ray tube start from rest and are accelerated through a potential difference of 12.0 kV. They are moving in the +x- direction when they enter the space between the plates of a pa...

Q: Nuclei in a radium-226 radioactive source emit photons whose energy

Nuclei in a radium-226 radioactive source emit photons whose energy is 186 keV. These photons are scattered by the electrons in a metal target; a detector measures the energy of the scattered photons...

Q: The spectators at a sports stadium are “doing the wave”:

The spectators at a sports stadium are “doing the wave”: they stand and raise their arms simultaneously with those in front of them and slightly after their neighbors on one side. This gives the appea...

Q: A 12 Ω resistor has a potential difference of 16 V across

A 12 Ω resistor has a potential difference of 16 V across it. What current flows through the resistor?

Q: The piano strings that vibrate with the lowest frequencies consist of a

The piano strings that vibrate with the lowest frequencies consist of a steel wire around which a thick coil of copper wire is wrapped. Only the inner steel wire is under tension. What is the purpose...

Q: An image of a biological sample is to have a resolution of

An image of a biological sample is to have a resolution of 5 nm. (a) What is the kinetic energy of a beam of electrons with a de Broglie wavelength of 5.0 nm? (b) Through what potential difference s...

Q: A 0.020 kg bullet is shot horizontally and collides with

A 0.020 kg bullet is shot horizontally and collides with a 2.00 kg block of wood. The bullet embeds in the block, and the block slides along a horizontal surface for 1.50 m. If the coefficient of kine...

Q: A copper wire is connected to an ideal battery at room temperature

A copper wire is connected to an ideal battery at room temperature. The current increases by a factor of 78 when the wire is immersed in liquid nitrogen (temperature 77 K). Ignoring changes in the wir...

Q: Refer to Example 26.1. Ashlin travels at speed 0

Refer to Example 26.1. Ashlin travels at speed 0.800c to a star 30.0 ly from Earth. (a) Find the distance between Earth and the star in the astronaut's frame of reference. (b) How long (as measured...