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A police car has a 1000Hz siren. It is traveling at 35m/s on a day when the speed of sounds through air is 350m/s. The car approaches an observer who is standing along the roadside. What change of frequency does the observer hear?
A parallel plate capacitor has a capacitance C when there is no dieletric inside of it. Suppose a wedge of material with dielectric constant K is inserted in between the plates of the capacitor, find the new capacitance with this dielectric inserte..
The rifle fires a bullet with the speed 300m/s. The target is sitting on a tree 100m away from the shooter. What initial angle should be the rifle directed to hit a target
At what temperature is the diameter of the hole equal.
a 71 kg baseball lplayer jumps straight up to catch a line drive. If the 140 g ball is moving horizontally at 28 m/s, what is his speed immediately after stopping the ball
Two small frogs simultaneously leap straight up from a lily pad. Frog A leaps with an initial velocity of 0.676 m/s, what is the position and velocity of the other frog
An electric dipole has opposite charges of 5 x10^15 C separated by a distance of 0.4mm. find the potential energy of the dipole in the given position
It eventually launches horizontally off of the table and takes the path of a projectile until it hits the ground 40 centimeters from the edge of the table.
A 0.140 kg baseball is thrown horizontally with a velocity of 28.9 m/s. It is struck with a constant horizontal force that lasts for 1.85 ms, What was the magnitude of the horizontal force
A well-thrown ball is caught in a well-padded mitt. If the deceleration of the ball is 2.10×104 m/s2, what was the initial velocity of the ball
A bat flies toward a wall at a speed of 5.5 m/s. As it flies, the bat emits an ultrasonic sound wave with frequency 29.0 kHz. What frequency does the bat hear in the reflected wave
a car weighs 1,725 kg and is speeding on I-75 at 90 miles per hour. The brake rotors are made of 20 kg of iron and steel composite. What is the temperature change in the rotors
A Carnot heat engine is to be designed with an efficiency of 81%. what is the temperature of the "hot" reservoir
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