Questions from Modern Physics

Q: You are designing a slide for a water park. In a

You are designing a slide for a water park. In a sitting position, park guests slide a vertical distance h down the waterslide, which has negligible friction. When they reach the bottom of the slide,...

Q: Occasionally, a rotating neutron star (see Exercise 10.41

Occasionally, a rotating neutron star (see Exercise 10.41) undergoes a sudden and unexpected speedup called a glitch. One explanation is that a glitch occurs when the crust of the neutron star settles...

Q: A 500.0-g bird is flying horizontally at 2

A 500.0-g bird is flying horizontally at 2.25 m/s, not paying much attention, when it suddenly flies into a stationary vertical bar, hitting it 25.0 cm below the top (Fig. P10.85). The bar is uniform,...

Q: A small block with mass 0.130 kg is attached to

A small block with mass 0.130 kg is attached to a string passing through a hole in a frictionless, horizontal surface .The block is originally revolving in a circle with a radius of 0.800 m about the...

Q: The V6 engine in a 2014 Chevrolet Silverado 1500 pickup truck is

The V6 engine in a 2014 Chevrolet Silverado 1500 pickup truck is reported to produce a maximum power of 285 hp at 5300 rpm and a maximum torque of 305 ft.lb at 3900 rpm. (a) Calculate the torque, in b...

Q: You have one object of each of these shapes, all with

You have one object of each of these shapes, all with mass 0.840 kg: a uniform solid cylinder, a thin-walled hollow cylinder, a uniform solid sphere, and a thin-walled hollow sphere. You release each...

Q: You are testing a small flywheel (radius 0.166 m

You are testing a small flywheel (radius 0.166 m) that will be used to store a small amount of energy. The flywheel is pivoted with low-friction bearings about a horizontal shaft through the flywheel’...

Q: A 72.0-kg weightlifter doing arm raises holds a

A 72.0-kg weightlifter doing arm raises holds a 7.50-kg weight. Her arm pivots around the elbow joint, starting 40.0° below the horizontal (Fig. P11.54). Biometric measurements have shown t...

Q: Women often suffer from back pains during pregnancy. Model a woman

Women often suffer from back pains during pregnancy. Model a woman (not including her fetus) as a uniform cylinder of diameter 30 cm and mass 60 kg. Model the fetus as a 10-kg sphere that is 25 cm in...

Q: You are asked to design the decorative mobile shown in Fig.

You are asked to design the decorative mobile shown in Fig. P11.56. The strings and rods have negligible weight, and the rods are to hang horizontally. (a) Draw a free-body diagram for each rod. (b) F...