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A hammer taps on the end of a 4.00-m-long metal bar at room temperature. A microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. The pulses are separated in time by 11.1ms .
What is the speed of sound in this metal?
A 7.90×10-2-{rm kg} toy airplane is tied to the ceiling with a string. While the airplane's motor is started, it moves with a constant speed of 1.20m/s in a horizontal circle of radius 0.50m.
a ball is thrown upward from the roof of a building, passes the roof going down three seconds later, and hits the ground one second after that. how tall is the building? how fast did the ball strike the ground?
You have a 2.01-m-long stretched string with a mass of 19.5 g. When you oscillate the string at 440 Hz, Calculate the tension in the string
A parallel plate capacitor has circular plates of diameter 12 cm. The plates are separated by 3 cm, what is the value of the electric field between the plates
A 96N grocery cart is pushed 10m along an aisle by a shopper who exerts a constant horizontal force of 40-N. If all frictional forces are neglected and cart starts from rest, what is the grocery cart's final speed.
An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 443 Hz when the train is approaching him.
A certain airplane has a speed of 250.0 km/h and is diving at an angle of 30.0° below the horizontal when the pilot releases a radar decoy. The horizontal distance between the release point and the point where the decoy strikes the ground is 700 m..
If the spring is stretched by 1.4 times the value in part A, and then released from rest, and the coefficient of kinetic friction between the box and the plank is 0.34, what is the magnitude of the initial acceleration of block as it starts moving..
Calculate the ratio of the drag force on a jet flying at 1132 km/h at an altitude of 10.0 km to the drag force on a prop-driven transport flying at 547 km/h
A 2.8 kg rectangular air mattress is 2 m long, 0.5 m wide, and 0.1 m thick. What mass can it support in water before sinking.
Initially stationary (the train starts at rest), a train has a constant acceleration of 0.6 m/s2, What is its speed after 21 s
An electron is brought to a point 0.2m from the center of a conducting sphere of radius 0.1m carrying a charge of 4.0x10^-6 C, What is the force acting on the electron
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