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A fire engine moving to the right at 40 m/s sound its horn (frequency = 500 Hz) at the two vehicles shown in the figure. The car is moving to the right at 30 m/s, while the van is at rest. (a) What frequency is heard by the passenger in the car? (b) What is the frequency as heard by the passengers in the van? (c) When the fire engine is 200 m from the car and 250 m from the van, the passengers in the car hear the sound intensity level of 90 dB. At that moment, what intensity level is heard by the passenger in the van?
The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0^\circ above the horizontal, some of the tiny critters have reached a maximum height of 52.7cm above the level ground.
A 0.00893-kg bullet is fired straight up at a falling wooden block that has a mass of 1.80 kg. The bullet has a speed of 551 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for..
a dog runs down a driveway with initial speed of 5 m/s for 8s, then uniformly increases his speed to 10 m/s in 5 s, determine How long is his driveway
A building having a steel infrastructure is 5.94 102 m high on a day when the temperature is 0.00 °C. How much taller is the building on a day
A single-turn current loop, carrying a current of 4.41 A, is in the shape of a right triangle with sides 42.1, 94.5, and 103 cm. What is the magnitude of the net force on the loop
A heat engine has a useful work output of 4.0 kJ and expels 8.0 kJ of exhaust energy in each cycle. what is the engine's thermal efficiency
Suppose that the amount of heat removed when 1.6 kg of water freezes at 0.0 oC were removed from ethyl alcohol at its freezing/melting point of -114.4 oC. How many kilograms of ethyl alcohol would freeze
An archer pulls back 0.75 m on a bow which has a stiffness of 200 N/m. The arrow weighs 50 g. What is the velocity of the arrow immediately after release
Two tug boats are towing a ship. Each exerts a horizontal force of 5 tons and the angle between their towropes is 90 degrees. What net force is exerted on the ship?
A hotel elevator ascends 170m with a maximum speed of 4.4m/s. Its acceleration and deceleration both have a magnitude of 1m/s2.
Two vectors A and B have components (0, 1) and (-1, 3), respectively. What are the components of the sum of these two vectors
A bullet with mass 4.85 g is fired horizontally into a 1.965-kg block attached to a horizontal spring. The spring has a constant 6.29 102 N/m and reaches a maximum compression of 6.40 cm. Find the initial speed of the bullet–block system. m/s
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