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A loudspeaker is generating sound in a room. At a certain point, the sound waves coming directly from the speaker (without reflecting from the walls) create an intensity level of 78.0 dB. The waves reflected from the walls create, by themselves, an intensity level of 71.2 dB at the same point. What is the total intensity level? (Hint: The answer is not 149.2 dB.)
Cells maintain a high concentration of macromolecules inside them. How do you expect this to affect the osmotic pressure inside the cell? What mechanisms does the cell use to counterbalance osmotic pressure? What are "depletion forces" and why are..
A 48.21 {rm kg} ice skater spins about the vertical axis through her body with her arms horizontally outstretched, making 2.20 turns each second. The distance from one hand to the other is 1.5 {rm m}. Biometric measurements indicate that each hand na..
What is the highest speed with which an 1180-kg car can round a turn of radius 75.00 m on a flat road if the coefficient of static friction between tires and road is 0.80.
Monochromatic light ( = 630 nm) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.20 m from the slits. It shows the interference pattern observed on the screen. What is the slit separatio..
Just before the collision and in kilometers per hour, what was the speed of the rocket piece relative to the satellite if both were in circular orbits and the collision was (a) head-on and (b) along perpendicular paths.
What is the speed of the arrow as it leaves the bow. At a height of 5 meters above the surface of a lake, a sound pulse is generated. The echo from the bottom of the lake returns to point of origin 0.130 s later. The air and water temperatures are ..
A water pipe having a 2.9 cm inside diameter carries water into the basement of a house at a speed of 0.87 m/s and a pressure of 174 kPa, What is the speed and water pressure at the second floor
A skier with a mass of 63 kg starts from rest and skis down an icy slope that has a length of 50 m at an angle of 32 degrees with respect to the horizontal. Iillustrate what is the speed of the skier at the bottom of the slope?
The Moon moves noticeably on the celestial sphere over the space of a single night. To show this, calculate how long it takes the Moon to move through an angle equal to its own angular diameter (0.5 degrees) against the background of the stars. Gi..
A gun is fired vertically into a 2.00 kg block of wood at rest straight above it. If the bullet has a mass of 21.0 g and a speed of 198 m/s, how high would the block rise into the air after the bullet becomes embedded in it.
An electron accelerated from rest through the voltage of 500V enters a region of constant magnetic field. If the electron follows a circular path with a radius of 17cm, what is the magnitude of magnetic field.
Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and kno..
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