Questions from Modern Physics

Q: At a certain instant, the earth, the moon, and

At a certain instant, the earth, the moon, and a stationary 1250-kg spacecraft lie at the vertices of an equilateral triangle whose sides are 3.84 × 105 km in length. (a) Find the magnitude and direct...

Q: Many satellites are moving in a circle in the earth’s equatorial plane

Many satellites are moving in a circle in the earth’s equatorial plane. They are at such a height above the earth’s surface that they always remain above the same point. (a) Find the altitude of these...

Q: Some scientists are eager to send a remote-controlled submarine to

Some scientists are eager to send a remote-controlled submarine to Jupiter’s moon Europa to search for life in its oceans below an icy crust. Europa’s mass has been measured to be 4.80 × 1022 kg, its...

Q: A hammer with mass m is dropped from rest from a height

A hammer with mass m is dropped from rest from a height h above the earth’s surface. This height is not necessarily small compared with the radius RE of the earth. Ignoring air resistance, derive an e...

Q: (a) Calculate how much work is required to launch a

(a) Calculate how much work is required to launch a spacecraft of mass m from the surface of the earth (mass mE, radius RE) and place it in a circular low earth orbit—that is, an orbit whose altitude...

Q: What is the wavelength of the wave that travels on the surface

What is the wavelength of the wave that travels on the surface of the vocal folds when they are vibrating at frequency f? (a) 2.0 mm; (b) 3.3 mm; (c) 0.50 cm; (d) 3.0 cm.

Q: Which of these is a possible mathematical description of the wave in

Which of these is a possible mathematical description of the wave in Problem 15.78? Data from Problem 15.78: What is the wavelength of the wave that travels on the surface of the vocal folds when th...

Q: The wave speed is measured for different vibration frequencies. A graph

The wave speed is measured for different vibration frequencies. A graph of the wave speed as a function of frequency (Fig. P15.80) indicates that as the frequency increases, the wavelength (a) increas...

Q: Based on these data, what is the most likely composition of

Based on these data, what is the most likely composition of this planet? (a) Mostly iron; (b) iron and rock; (c) iron and rock with some lighter elements; (d) hydrogen and helium gases.

Q: How many times the acceleration due to gravity g near the earth’s

How many times the acceleration due to gravity g near the earth’s surface is the acceleration due to gravity near the surface of this exoplanet? (a) About 0.29g; (b) about 0.65g; (c) about 1.5g; (d) a...