Questions from College Physics

Q: An ambulance traveling at 44 m/s approaches a car heading

An ambulance traveling at 44 m/s approaches a car heading in the same direction at a speed of 28 m/s. The ambulance driver has a siren sounding at 550 Hz. At what frequency does the driver of the car...

Q: How much work is done by the motor in a CD player

How much work is done by the motor in a CD player to make a CD spin, starting from rest? The CD has a diameter of 12.0 cm and a mass of 15.8 g. The laser scans at a constant tangential velocity of 1.2...

Q: Two identical beakers are filled to the brim and placed on balance

Two identical beakers are filled to the brim and placed on balance scales. The base area of the beakers is large enough that any water that spills out of the beakers will fall onto the table the scale...

Q: At a factory, a noon whistle is sounding with a frequency

At a factory, a noon whistle is sounding with a frequency of 500 Hz. As a car traveling at 85 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory,...

Q: A very large vat of water has a hole 1.00

A very large vat of water has a hole 1.00 cm in diameter located a distance 1.80 m below the water level. (a) How fast does water exit the hole? (b) How would your answer differ if the vat were fill...

Q: In parts of the midwestern United States, sirens sound when a

In parts of the midwestern United States, sirens sound when a severe storm that may produce a tornado is approaching. Mandy is walking at a speed of 1.56 m/s directly toward one siren and directly awa...

Q: An atomizer is a device that delivers a fine mist of some

An atomizer is a device that delivers a fine mist of some liquid such as perfume by blowing air horizontally over the top of a tube immersed in the liquid. Suppose a perfume with density 800 kg/m3 has...

Q: An 1100 kg airplane starts from rest and accelerates horizontally forward for

An 1100 kg airplane starts from rest and accelerates horizontally forward for 8.0 s until it reaches its takeoff speed of 35 m/s. What is the average net force on the airplane during this time?

Q: A speedboat is traveling at 20.1 m/s toward

A speedboat is traveling at 20.1 m/s toward another boat moving in the opposite direction with a speed of 15.6 m/s. The speedboat pilot sounds his horn, which has a frequency of 312 Hz. What is the fr...

Q: Fish don’t move as fast as you might think. A small

Fish don’t move as fast as you might think. A small trout has a top swimming speed of only about 2 m/s, which is about the speed of a brisk walk (for a human, not a fish!). It may seem to move faster...