Questions from Modern Physics

Q: A satellite with mass 848 kg is in a circular orbit with

A satellite with mass 848 kg is in a circular orbit with an orbital speed of 9640 m/s around the earth. What is the new orbital speed after friction from the earth’s upper atmosphere has done -7.50 ×...

Q: Planets are not uniform inside. Normally, they are densest at

Planets are not uniform inside. Normally, they are densest at the center and have decreasing density outward toward the surface. Model a spherically symmetric planet, with the same radius as the earth...

Q: One of the brightest comets of the 20th century was Comet Hyakutake

One of the brightest comets of the 20th century was Comet Hyakutake, which passed close to the sun in early 1996. The orbital period of this comet is estimated to be about 30,000 years. Find the semi-...

Q: An object in the shape of a thin ring has radius a

An object in the shape of a thin ring has radius a and mass M. A uniform sphere with mass m and radius R is placed with its center at a distance x to the right of the center of the ring, along a line...

Q: A uniform wire with mass M and length L is bent into

A uniform wire with mass M and length L is bent into a semicircle. Find the magnitude and direction of the gravitational force this wire exerts on a point with mass m placed at the center of curvature...

Q: A shaft is drilled from the surface to the center of the

A shaft is drilled from the surface to the center of the earth. As in Example 13.10 (Section 13.6), make the unrealistic assumption that the density of the earth is uniform. With this approximation, t...

Q: A spherical mirror is cut in half horizontally. Will an image

A spherical mirror is cut in half horizontally. Will an image be formed by the bottom half of the mirror? If so, where will the image be formed?

Q: A rocket is moving to the right at 1/2 the

A rocket is moving to the right at 1/2 the speed of light relative to the earth. A light bulb in the center of a room inside the rocket suddenly turns on. Call the light hitting the front end of the r...

Q: Figure P34.100 is a diagram of a Galilean telescope,

Figure P34.100 is a diagram of a Galilean telescope, or opera glass, with both the object and its final image at infinity. The image I serves as a virtual object for the eyepiece. The final image is v...

Q: Figure P34.101 shows a simple version of a zoom lens

Figure P34.101 shows a simple version of a zoom lens. The converging lens has focal length f1 and the diverging lens has focal length f2 = - f2 . The two lenses are separated by a variable distance d...