Questions from Modern Physics

Q: Firemen use a high-pressure hose to shoot a stream of

Firemen use a high-pressure hose to shoot a stream of water at a burning building. The water has a speed of 25.0 m/s as it leaves the end of the hose and then exhibits projectile motion. The firemen a...

Q: A man stands on the roof of a 15.0-

A man stands on the roof of a 15.0-m-tall building and throws a rock with a speed of 30.0 m/s at an angle of 33.0° above the horizontal. Ignore air resistance. Calculate (a) the maximum height above t...

Q: Can you have zero velocity and nonzero average acceleration? Zero velocity

Can you have zero velocity and nonzero average acceleration? Zero velocity and nonzero acceleration? Use a vx-t graph to explain, and give an example of such motion.

Q: A 124-kg balloon carrying a 22-kg basket is

A 124-kg balloon carrying a 22-kg basket is descending with a constant downward velocity of 20.0 m/s. A 1.0-kg stone is thrown from the basket with an initial velocity of 15.0 m/s perpendicular to the...

Q: The earth has a radius of 6380 km and turns around once

The earth has a radius of 6380 km and turns around once on its axis in 24 h. (a) What is the radial acceleration of an object at the earth’s equator? Give your answer in m/s2 and as a fraction of g. (...

Q: Our balance is maintained, at least in part, by the

Our balance is maintained, at least in part, by the endolymph fluid in the inner ear. Spinning displaces this fluid, causing dizziness. Suppose that a skater is spinning very fast at 3.0 revolutions p...

Q: A jet plane comes in for a downward dive as shown in

A jet plane comes in for a downward dive as shown in Fig. E3.25. The bottom part of the path is a quarter circle with a radius of curvature of 280 m. According to medical tests, pilots will lose consc...

Q: A model of a helicopter rotor has four blades, each 3

A model of a helicopter rotor has four blades, each 3.40 m long from the central shaft to the blade tip. The model is rotated in a wind tunnel at 550 rev/min. (a) What is the linear speed of the blade...

Q: A Ferris wheel with radius 14.0 m is turning about

A Ferris wheel with radius 14.0 m is turning about a horizontal axis through its center (Fig. E3.27). The linear speed of a passenger on the rim is constant and equal to 6.00 m/s. What are the magnitu...

Q: The radius of the earth’s orbit around the sun (assumed to

The radius of the earth’s orbit around the sun (assumed to be circular) is 1.50 × 108 km, and the earth travels around this orbit in 365 days. (a) What is the magnitude of the orbital velocity of the...